CN117706019A - A control system and method for combustion research under time-varying inflow - Google Patents

Abstract

The invention discloses a regulation and control system for combustion research under time-varying incoming flow, which comprises a flow regulation and control device, an oil circuit system and a signal feedback system. The flow regulating device consists of an air compressor, a surge tank, an electric regulating valve group, a flowmeter and the like, and fine control of the air flow is realized by regulating the electric valves of different branches. The oil circuit system comprises multiple paths of fuel oil supply corresponding to the combustion chamber and the heater, and is controlled in a closed loop mode according to the set fuel oil flow. The signal feedback system collects parameter signals in real time through a pressure gauge and a flowmeter which are arranged at key positions. During time-varying regulation, closed-loop control of air and fuel flow is realized through PID regulation; different air time-varying flow rate change rates are realized by changing the opening degree of the valve and the path of the pipeline; the accurate adjustment of the temperature is realized by matching the oil-gas ratio of the fuel oil and the air. The invention can flexibly and accurately realize time-varying regulation and control of air flow and temperature, and meet the requirement of combustion process research on condition control.

Description

A control system and method for combustion research under time-varying inflow

Technical field

The invention relates to the technical field of engine combustion characteristics testing, and in particular to a control system and method for time-varying downflow combustion research.

Background technique

During the change of flight attitude or engine operating mode conversion process, the inlet flow field of afterburning, sub-ramjet and multi-mode ramjet combustors has a time-varying state. Ramjet engine combustors and turbine engine afterburners are often in the inlet state. The working state of the aerodynamic and thermal parameters changes rapidly, and the physical parameters during the mode conversion process of the super combustion chamber of the combined engine have extremely strong time-varying characteristics. The construction of a test system that can simulate the above dynamic change process can provide guidance for the development of advanced ramjet engine combustion chambers. , Experimental research related to turbine engine afterburners and combined power combustors. Currently, the relevant test systems mostly use manual valves or electric valves to adjust a single parameter, which cannot achieve time-varying control characteristics of multi-parameter matching.

Contents of the invention

The technical problem to be solved by the present invention is to provide a control system and method for time-varying incoming flow combustion research in order to solve the flow control problem in combustion test research and to solve the problem of flow control in the engine working state in view of the defects involved in the background technology. During the change process, the combustion chamber inlet state is often a time-varying incoming flow condition. The time-varying control method provided by the present invention can effectively create time-varying incoming flow test conditions.

The present invention adopts the following technical solutions to solve the above technical problems:

A control system for combustion research under time-varying incoming flow, including an air compressor, a pressure stabilizing tank, the first to sixth electric control valves, a manual flow control valve, an air flow meter, a 500°C electric heater, and an electric butterfly valve , first to second safety valves, 200°C electric heater, gas heater, air blender, temperature sensor, first to third pressure sensors, combustion chamber, vacuum tank, vacuum pressure gauge, vacuum pump, fuel Fuel tank, first to third fuel pumps, first to third electric oil delivery valves, first to third manual oil delivery valves, first to third electric oil return valves, first to third manual oil return valves, The first to third fuel flow meters and the first to third fuel supply pressure gauges;

The pressure stabilizing tank includes an inlet, a pressure measuring point and an outlet;

The air blender includes first to third inlets and an outlet, for blending the air entering from the first to third inlets and then discharging it from the outlet;

The gas heater includes an air inlet, an air outlet and a fuel inlet, and is used to heat the air entering from the air inlet and then discharge it from the air outlet;

The combustion chamber includes an air inlet, an air outlet, a first fuel inlet and a second fuel inlet;

The fuel tank includes first to third inlets and first to third outlets;

The vacuum tank includes an air inlet, a pressure measuring point, a first air outlet and a second air outlet;

The inlet of the air compressor is connected to the outside air, and the outlet is connected to the inlet pipe of the pressure stabilizing tank;

The outlet of the pressure stabilizing tank is connected to one end of the pipeline of the first electric regulating valve, the second electric regulating valve, the manual flow regulating valve and the air flow meter respectively. The first electric regulating valve, the second electric regulating valve, the manual flow regulating valve The other end of the regulating valve is connected to the outside air, and the other end of the air flow meter is connected to one end of the third electric regulating valve, one end of the fourth electric regulating valve, one end of the fifth electric regulating valve, and the inlet of the second safety valve respectively. pipes connected;

The first pressure sensor is arranged at the pressure measuring point of the pressure tank;

The other end of the third electric regulating valve, the 500°C level electric heater, and one end of the electric butterfly valve are connected by pipelines in sequence;

The other end of the electric butterfly valve is connected to the first inlet pipe of the air blender;

The other end of the fourth electric regulating valve is connected to the second inlet of the air blender and the inlet pipe of the first safety valve respectively;

The other end of the fifth electric regulating valve, the 200°C electric heater, and the air inlet of the gas heater are connected by pipelines in sequence;

The third inlet of the air blender is connected to the outlet pipe of the gas heater, and the outlet of the air blender is connected to the air inlet pipe of the combustion chamber;

The temperature sensor, the second pressure sensor and the third pressure sensor are all arranged in the pipe between the air blender outlet and the combustion chamber air inlet, wherein the temperature sensor is used to measure the temperature where it is located, and the second pressure sensor It is used to measure the static pressure where it is located, and the third pressure sensor is used to measure the total pressure where it is located;

The air inlet of the vacuum tank is connected to the air outlet pipe of the combustion chamber, the first air outlet is connected to one end of the sixth electric regulating valve, and the second air outlet is connected to one end of the vacuum pump;

The other end of the sixth electric regulating valve and the other end of the vacuum pump are both connected to outside air;

The vacuum pressure gauge is installed at the pressure measuring point of the vacuum tank for measuring the internal pressure;

The first to third outlets of the fuel tank are connected to the inlets of the first to third fuel pumps in one-to-one corresponding pipelines;

The outlet of the first fuel pump is connected to one end of the first electric oil delivery valve and one end of the first electric oil return valve respectively;

The other end of the first electric oil delivery valve, the first manual oil delivery valve, and the fuel inlet of the gas heater are connected by pipelines in sequence;

The other end of the first electric oil return valve, the first manual oil return valve, and the first inlet of the fuel tank are connected by pipelines in sequence;

The first fuel flow meter and the first fuel supply pressure gauge are both arranged in the pipeline between the first manual oil outlet valve and the fuel inlet of the gas heater, and are respectively used to measure the fuel flow and oil pressure at their locations. ;

The outlet of the second fuel pump is connected to one end of the second electric oil delivery valve and one end of the second electric oil return valve respectively;

The other end of the second electric oil delivery valve, the second manual oil delivery valve, and the first fuel inlet of the combustion chamber are connected by pipelines in sequence;

The other end of the second electric oil return valve, the second manual oil return valve, and the second inlet of the fuel tank are connected by pipelines in sequence;

The second fuel flow meter and the second fuel supply pressure gauge are both arranged in the pipeline between the second manual oil outlet valve and the fuel inlet of the gas heater, and are respectively used to measure the fuel flow and oil flow at their locations. pressure;

The outlet of the third fuel pump is connected to one end of the third electric oil delivery valve and one end of the third electric oil return valve respectively;

The other end of the third electric oil delivery valve, the third manual oil delivery valve, and the first fuel inlet of the combustion chamber are connected by pipelines in sequence;

The other end of the third electric oil return valve, the third manual oil return valve, and the third inlet of the fuel tank are connected by pipelines in sequence;

The third fuel flow meter and the third fuel supply pressure gauge are both arranged in the pipeline between the third manual oil outlet valve and the fuel inlet of the gas heater, and are respectively used to measure the fuel flow and oil pressure at their locations. .

As a further optimization solution of the control system of the present invention for time-varying downflow combustion research, the pipeline diameter of the first electric control valve is DN150, and the pipeline diameter of the second and third electric control valves is DN100.

The invention also discloses an air flow control method of the control system used for time-varying downflow combustion research, which includes the following steps:

Step A.1), the operator sets the target air flow value;

Step A.2), after the air flows through the air flow meter, the air flow meter measures the actual air flow in the pipe in real time;

Step A.3), calculate the difference between the actual air flow fed back by the air flow meter and the set target air flow value, and determine whether the difference between the actual air flow and the target air flow value is greater than or equal to the preset first flow threshold. ;

Step A.3.1), if the difference between the actual air flow and the target flow value is greater than or equal to the preset difference threshold, enter the coarse adjustment stage: control the opening of the first electric control valve to increase the preset first opening threshold;

Step A.3.2), if the difference between the actual air flow and the target flow value is less than the preset difference threshold, enter the fine adjustment stage: control the opening of the second electric control valve to increase the preset second opening threshold, so The preset second opening threshold is smaller than the preset first opening threshold;

Step A.4), repeat step A.3) until the difference between the actual air flow and the target air flow value is less than or equal to the preset second flow threshold.

The invention also discloses a time-varying air flow rate adjustment method of the control system used for time-varying downflow combustion research, which includes the following steps:

Step C.1), turn on the air compressor, close the first to sixth electric regulating valves and the manual flow regulating valve. At this time, the air enters the pressure stabilizing tank, and the first pressure sensor measures the actual pressure value inside it;

Step C.2), compare the actual pressure value fed back by the first pressure sensor with the preset target pressure value;

Step C.2.1), if the actual pressure value is less than the target pressure value and the difference between the target pressure value and the actual pressure value is greater than the preset differential pressure threshold, control the fifth regulating valve to reduce the preset fifth opening threshold;

Step C.2.2), if the actual pressure value is greater than the target pressure value and the difference between the actual pressure value and the target pressure value is greater than the preset differential pressure threshold, control the fifth regulating valve to increase the preset fifth opening threshold;

Step C.3), repeat step 2) until the absolute value of the difference between the actual pressure value and the target pressure value is less than or equal to the preset differential pressure threshold, and the pressure adjustment is completed. In this example, the preset fifth opening threshold is 10%;

Step C.4), calculate the difference between the actual air flow rate fed back by the air flow meter and the preset target air flow value, and determine whether the difference between the actual air flow rate and the target air flow value is greater than or equal to the preset first flow rate. threshold;

Step C.4.1), if the difference between the actual air flow and the target flow value is greater than or equal to the preset difference threshold, enter the coarse adjustment stage: control the opening of the first electric regulating valve to increase the preset first opening threshold;

Step C.4.2), if the difference between the actual air flow and the target flow value is less than the preset difference threshold, enter the fine adjustment stage: control the opening of the second electric control valve to increase the preset second opening threshold, so The preset second opening threshold is smaller than the preset first opening threshold;

Step C.5), repeat Step C.4) until the difference between the actual air flow and the target air flow value is less than or equal to the preset second flow threshold, and the air flow adjustment is completed. At this time, through the second pressure sensor and the third Three pressure sensors and temperature sensors obtain and record the static pressure, total pressure and temperature of the air;

Step C.6), control the fifth electric regulating valve to increase the preset sixth opening threshold to achieve time-varying flow regulation during the acceleration process. In this example, the preset second opening threshold is 20%;

Step C.7), obtain the static pressure, total pressure and temperature changes of the air through the second pressure sensor, the third pressure sensor and the temperature sensor, and calculate the actual inlet air flow rate with time by combining the gas state equation and the continuity equation. rate of change;

Step C.8), compare the preset target pressure value with the maximum pressure value of the air compressor;

Step C.8.1), if the preset target pressure value is less than the maximum pressure value of the air compressor, compare the calculated actual air flow change rate with the target air flow change rate value;

Step C.8.1.1), if the actual air flow change rate is less than the target air flow change rate value and the difference between the target air flow change rate value and the actual air flow change rate is greater than the preset air flow change rate difference threshold, adjust The preset target pressure value increases the preset first pressure threshold, and jumps to step C.1);

Step C.8.1.2), if the actual air flow change rate is greater than the target air flow change rate value and the difference between the actual air flow change rate and the target air flow change rate value is greater than the preset air flow change rate difference threshold, adjust The preset target pressure value reduces the preset first pressure threshold, and jumps to step C.1);

Step C.8.2), if the preset target pressure value is greater than or equal to the maximum pressure value of the air compressor and the difference between the actual air flow change rate and the target air flow change rate value is greater than the preset air flow change rate difference threshold , close the fifth electric control valve, and use the third electric control valve for time-varying adjustment:

Step C.8.2.1), adjust the preset target pressure value to be less than the maximum pressure value of the air compressor;

Step C.8.2.2), turn on the air compressor, close the first to sixth electric regulating valves and manual flow regulating valve;

Step C.8.2.3), compare the actual pressure value fed back by the first pressure sensor with the target pressure value;

Step C.8.2.3.1), if the actual pressure value is less than the target pressure value and the difference between the target pressure value and the actual pressure value is greater than the preset differential pressure threshold, control the third regulating valve to reduce the preset seventh opening threshold ;

Step C.8.2.3.2), if the actual pressure value is greater than the target pressure value and the difference between the actual pressure value and the target pressure value is greater than the preset differential pressure threshold, control the third regulating valve to increase the preset seventh opening threshold ;

Step C.8.2.4), repeat step C.8.2.3) until the absolute value of the difference between the actual pressure value and the target pressure value is less than or equal to the preset differential pressure threshold, and the pressure adjustment is completed. In this example, the preset The seventh opening threshold is 10%;

Step C.9), calculate the difference between the actual air flow rate fed back by the air flow meter and the preset target air flow value, and determine whether the difference between the actual air flow rate and the target air flow value is greater than or equal to the preset first flow rate. threshold;

Step C.9.1), if the difference between the actual air flow and the target flow value is greater than or equal to the preset difference threshold, enter the coarse adjustment stage: control the opening of the first electric regulating valve to increase the preset first opening threshold;

Step C.9.2), if the difference between the actual air flow and the target flow value is less than the preset difference threshold, enter the fine adjustment stage: control the opening of the second electric control valve to increase the preset second opening threshold, so The preset second opening threshold is smaller than the preset first opening threshold;

Step C.10), repeat step C.9) until the difference between the actual air flow and the target air flow value is less than or equal to the preset second flow threshold, and the air flow adjustment is completed. At this time, through the second pressure sensor and the third Three pressure sensors and temperature sensors obtain and record the static pressure, total pressure and temperature of the air;

Step C.11), control the third electric regulating valve to increase the preset sixth opening threshold to achieve time-varying flow regulation during the acceleration process;

Step C.12), obtain the static pressure, total pressure and temperature changes of the air through the second pressure sensor, the third pressure sensor and the temperature sensor, and calculate the actual inlet air flow rate with time by combining the gas state equation and the continuity equation. rate of change;

Step C.13), compare the calculated actual air flow change rate with the target air flow change rate value;

Step C.13.1), if the actual air flow change rate is less than the target air flow change rate value and the difference between the target air flow change rate value and the actual air flow change rate value is greater than the preset air flow change rate difference threshold, adjust the preset The target pressure value increases the preset first pressure threshold, and jumps to step C.8.2.2);

Step C.13.2), if the actual air flow change rate is greater than the target air flow change rate value and the difference between the actual air flow change rate and the target air flow change rate value is greater than the preset air flow change rate difference threshold, adjust the preset The target pressure value is reduced by the preset first pressure threshold, and jumps to step C.8.2.2).

Compared with the existing technology, the present invention adopts the above technical solution and has the following technical effects:

1. The present invention can stabilize the upstream pressure of the pipeline through the pressure stabilizing tank, realize time-varying inflow conditions through the change of the valve opening of the electric regulating valve, and realize different time-varying inflow conditions by adjusting the pressure of the pressure stabilizing tank and changing the branch diameter. Flow rate of change;

2. The present invention can realize feedback control of air flow. It combines the deflation branches with different diameters and electric deflation valves, and automatically adjusts the target set value of the air flow value through PID control to achieve a wide range of air flow, high precision and rapid response. adjust;

3. The present invention can couple the oil circuit system for oil outlet and oil return control, automatically adjust the fuel flow value target setting value through PID control, and realize rapid response adjustment of fuel flow;

4. The present invention can realize time-varying adjustment of fuel flow through the oil circuit system coupling oil outlet and oil return control, and couple it with air flow adjustment to achieve coordinated adjustment of fuel flow and air flow. This method can maintain The gas heater keeps the oil-gas ratio unchanged during the time-varying control process and keeps the temperature constant during the time-varying control process.

Description of the drawings

Figure 1 shows the time-varying control system used in the combustion test system of the present invention;

Figure 2 is an adjustment method for air flow adjustment according to the present invention;

Figure 3 is an adjustment method for fuel flow adjustment according to the present invention;

Figure 4 is an adjustment method for air time-varying flow adjustment according to the present invention;

Figure 5 is an adjustment method for collaborative adjustment of fuel flow and air flow according to the present invention;

In the picture, 1-air compressor, 2-pressure tank, 3-first pressure sensor, 4-first electric control valve, 5-second electric control valve, 6-manual flow control valve, 7-air flow meter , 8-The third electric regulating valve, 9-500℃ electric heater, 10-Electric butterfly valve, 11-The fourth electric regulating valve, 12-The first safety valve, 13-The second safety valve, 14-The fifth electric Regulating valve, 15-200℃ electric heater, 16-gas heater, 17-air blender, 18-temperature sensor, 19-second pressure sensor, 20-third pressure sensor, 21-combustion test section , 22-vacuum tank, 23-vacuum pressure gauge, 24-sixth electric regulating valve, 25-vacuum pump, 26-fuel tank, 27-first fuel pump, 28-first electric oil delivery valve, 29-first manual Oil delivery valve, 30-first electric oil return valve, 31-first manual oil return valve, 32-first fuel flow meter, 33-first oil supply pressure gauge, 34-second fuel pump, 35-second Electric oil delivery valve, 36-second manual oil delivery valve, 37-second electric oil return valve, 38-second manual oil return valve, 39-second fuel flow meter, 40-second oil supply pressure gauge , 41-The third fuel pump, 42-The third electric oil delivery valve, 43-The third manual oil delivery valve, 44-The third electric oil return valve, 45-The third manual oil return valve, 46-The third fuel flow rate Gauge, 47-third oil supply pressure gauge.

Implementation

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings:

The invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components and/or sections, these elements, components and/or sections are not limited by these terms. These terms are only used to distinguish elements, components and/or parts from each other. Thus, a first element, component or section discussed below could be a second element, component or section without departing from the teachings of the present invention.

As shown in Figure 1, the present invention discloses a control system for combustion research under time-varying incoming flow, including an air compressor, a pressure stabilizing tank, first to sixth electric control valves, a manual flow control valve, and an air flow meter. , 500℃ electric heater, electric butterfly valve, first to second safety valve, 200℃ electric heater, gas heater, air blender, temperature sensor, first to third pressure sensor, combustion chamber, Vacuum tank, vacuum pressure gauge, vacuum pump, fuel tank, first to third fuel pumps, first to third electric oil delivery valves, first to third manual oil delivery valves, first to third electric oil return valves, The first to third manual oil return valves, the first to third fuel flow meters, and the first to third fuel supply pressure gauges;

The pressure stabilizing tank includes an inlet, a pressure measuring point and an outlet;

The air blender includes first to third inlets and an outlet, for blending the air entering from the first to third inlets and then discharging it from the outlet;

The gas heater includes an air inlet, an air outlet and a fuel inlet, and is used to heat the air entering from the air inlet and then discharge it from the air outlet;

The combustion chamber includes an air inlet, an air outlet, a first fuel inlet and a second fuel inlet;

The fuel tank includes first to third inlets and first to third outlets;

The vacuum tank includes an air inlet, a pressure measuring point, a first air outlet and a second air outlet;

The inlet of the air compressor is connected to the outside air, and the outlet is connected to the inlet pipe of the pressure stabilizing tank;

The outlet of the pressure stabilizing tank is connected to one end of the pipeline of the first electric regulating valve, the second electric regulating valve, the manual flow regulating valve and the air flow meter respectively. The first electric regulating valve, the second electric regulating valve, the manual flow regulating valve The other end of the regulating valve is connected to the outside air, and the other end of the air flow meter is connected to one end of the third electric regulating valve, one end of the fourth electric regulating valve, one end of the fifth electric regulating valve, and the inlet of the second safety valve respectively. pipes connected;

The first pressure sensor is arranged at the pressure measuring point of the pressure tank;

The other end of the third electric regulating valve, the 500°C level electric heater, and one end of the electric butterfly valve are connected by pipelines in sequence;

The other end of the electric butterfly valve is connected to the first inlet pipe of the air blender;

The other end of the fourth electric regulating valve is connected to the second inlet of the air blender and the inlet pipe of the first safety valve respectively;

The other end of the fifth electric regulating valve, the 200°C electric heater, and the air inlet of the gas heater are connected by pipelines in sequence;

The third inlet of the air blender is connected to the outlet pipe of the gas heater, and the outlet of the air blender is connected to the air inlet pipe of the combustion chamber;

The temperature sensor, the second pressure sensor and the third pressure sensor are all arranged in the pipe between the air blender outlet and the combustion chamber air inlet, wherein the temperature sensor is used to measure the temperature where it is located, and the second pressure sensor It is used to measure the static pressure where it is located, and the third pressure sensor is used to measure the total pressure where it is located;

The air inlet of the vacuum tank is connected to the air outlet pipe of the combustion chamber, the first air outlet is connected to one end of the sixth electric regulating valve, and the second air outlet is connected to one end of the vacuum pump;

The other end of the sixth electric regulating valve and the other end of the vacuum pump are both connected to outside air;

The vacuum pressure gauge is installed at the pressure measuring point of the vacuum tank for measuring the internal pressure;

The first to third outlets of the fuel tank are connected to the inlets of the first to third fuel pumps in one-to-one corresponding pipelines;

The outlet of the first fuel pump is connected to one end of the first electric oil delivery valve and one end of the first electric oil return valve respectively;

The other end of the first electric oil delivery valve, the first manual oil delivery valve, and the fuel inlet of the gas heater are connected by pipelines in sequence;

The other end of the first electric oil return valve, the first manual oil return valve, and the first inlet of the fuel tank are connected by pipelines in sequence;

The first fuel flow meter and the first fuel supply pressure gauge are both arranged in the pipeline between the first manual oil outlet valve and the fuel inlet of the gas heater, and are respectively used to measure the fuel flow and oil pressure at their locations. ;

The outlet of the second fuel pump is connected to one end of the second electric oil delivery valve and one end of the second electric oil return valve respectively;

The other end of the second electric oil delivery valve, the second manual oil delivery valve, and the first fuel inlet of the combustion chamber are connected by pipelines in sequence;

The other end of the second electric oil return valve, the second manual oil return valve, and the second inlet of the fuel tank are connected by pipelines in sequence;

The second fuel flow meter and the second fuel supply pressure gauge are both arranged in the pipeline between the second manual oil outlet valve and the fuel inlet of the gas heater, and are respectively used to measure the fuel flow and oil flow at their locations. pressure;

The outlet of the third fuel pump is connected to one end of the third electric oil delivery valve and one end of the third electric oil return valve respectively;

The other end of the third electric fuel delivery valve, the third manual fuel delivery valve, and the first fuel inlet of the combustion chamber are connected by pipelines in sequence;

The other end of the third electric oil return valve, the third manual oil return valve, and the third inlet of the fuel tank are connected by pipelines in sequence;

The third fuel flow meter and the third fuel supply pressure gauge are both arranged in the pipeline between the third manual oil outlet valve and the fuel inlet of the gas heater, and are respectively used to measure the fuel flow and oil pressure at their locations. .

The air compressed by the air compressor enters the pressure stabilizing tank to keep the upstream pressure stable; three regulating valves are installed behind the pressure stabilizing tank to adjust the total flow of the test pipeline, and then an air flow meter that can feedback the flow signal is installed; the air flow meter Finally, the test main pipeline is divided into three different branches, which are mixed in the air blender to ensure the uniformity of the airflow entering the combustion chamber. A temperature sensor, a second pressure sensor and a second pressure sensor are installed between the combustion chamber and the air blender. The third pressure sensor, the measurement and control system collects sensor signals to monitor the combustion process; a vacuum tank is installed behind the combustion chamber to stabilize the outlet pressure. The vacuum tank is connected to the vacuum pump to create the vacuum environment required for the combustion test; the vacuum tank is equipped with The vacuum pressure gauge and the sixth electric regulating valve adjust the pressure in the vacuum tank through the electric regulating valve. The vacuum pressure gauge displays the vacuum degree in the tank in real time.

The first electric regulating valve is used for rough adjustment of flow, and the second electric regulating valve is used for fine adjustment of flow; the air flow meter is used to measure the total flow in the test pipeline of the system; the first electric regulating valve can be controlled according to the set flow value. The regulating valve and the second electric regulating valve realize closed-loop flow control;

The 500℃ electric heater can heat the gas up to 500℃; the electric butterfly valve is set behind the 500℃ electric heater and connected to other test benches to prevent interference with the combustion chamber; the 200℃ electric heater can heat the gas up to 500℃. The gas is heated to 200℃; the gas heater can heat the gas to a maximum of 800℃;

The pipeline diameter of the first electric control valve is preferably DN150, which can be adjusted to achieve a larger time-varying flow change rate; the pipeline diameter of the third electric control valve is preferably DN100, which can be adjusted to achieve a smaller time-varying flow change. rate; the parameters of the second electric control valve and the third electric control valve are consistent. Under the same heating power and oil-gas ratio of the gas heater, the measurement and control system synchronously controls the two valves to achieve time-varying temperature control.

The first to third electric oil delivery valves and the first to third electric oil return valves are coupled to adjust the fuel flow, and the first to third fuel flow meters are used for flow measurement and feedback signals; according to the feedback signals, the first to third electric oil return valves are used to adjust the fuel flow. Three electric oil delivery valves and the first to third electric oil return valves are used for adjustment, and quick response adjustment of fuel flow is achieved through PID control.

The first fuel pump, the first electric oil delivery valve, the first manual oil delivery valve, the first electric oil return valve, the first manual oil return valve, the first fuel flow meter, and the first oil supply pressure gauge form the first oil circuit. System; the second fuel pump, the second electric oil delivery valve, the second manual oil delivery valve, the second electric oil return valve, the second manual oil return valve, the second fuel flow meter, and the second oil supply pressure gauge are formed Second oil circuit system; third fuel pump, third electric oil delivery valve, third manual oil delivery valve, third electric oil return valve, third manual oil return valve, third fuel flow meter, third oil supply pressure The table forms the third oil circuit system.

The first oil circuit system supplies oil to the gas heater; when the system flow signal changes, the required fuel flow is calculated according to the preset oil-to-gas ratio, and rapid response adjustment is performed to achieve coordinated adjustment of fuel flow and air flow, thereby ensuring that the gas The oil-to-air ratio in the heater is constant.

The second oil circuit system and the third oil circuit system are used for graded and zoned fuel supply to the combustion chamber in the test section; the control system calculates the required fuel flow based on the set oil-gas ratio and zoned fuel supply ratio to achieve coordinated regulation of fuel flow.

The adjustment speeds of the first to third electric oil delivery valves and the first to third electric oil return valves can be controlled through programming; different fuel flow rate changes can be achieved through different combinations of adjustment speeds; the fuel needs to be calibrated for the oil supply system before use. Flow change rate; under a specific time-varying flow change rate, calculate the fuel flow change curve; combined with the calibration results, program the adjustment rates of the first to third electric oil valves and the first to third electric oil return valves to achieve Coordinated regulation of fuel flow and air flow.

How the oil circuit system works: The measurement and control system sets the fuel flow value of each oil circuit respectively. Based on the fuel flow signal fed back by the flow meter, PID control is used to adjust the opening of the oil outlet valve and oil return valve to achieve closed-loop control.

The first oil circuit system is used to supply oil to the gas heater and can be used to adjust the temperature conditions at the inlet of the test section. When the air flow changes, the change in fuel flow is adjusted according to the change in air flow to maintain the internal temperature of the gas heater. The oil-gas ratio remains unchanged. Through this adjustment method, the temperature condition can be kept unchanged when the incoming flow is a time-varying flow rate; matching the opening adjustment of the fourth electric control valve and the fifth electric control valve can make the test pipeline in Under the condition of constant flow, time-varying temperature control is achieved.

The vacuum tank is installed behind the air outlet of the combustion chamber. The vacuum tank is connected to the vacuum pump and the sixth electric regulating valve. According to the pressure signal fed back by the second pressure sensor at the combustion chamber inlet, the measurement and control system calculates the error and accurately controls the sixth electric regulating valve. The opening of the valve can fine-tune the negative pressure in the vacuum tank in real time, thereby achieving time-varying control of the inlet pressure of the combustion chamber.

Please refer to the adjustment method shown in Figure 2 to adjust the air flow. The specific steps are as follows:

Step A.1), the operator sets the target air flow value, such as 0.5kg/s;

Step A.2), after the air flows through the air flow meter, the air flow meter measures the actual air flow in the pipe in real time, such as 0.3kg/s;

Step A.3), calculate the difference between the actual air flow fed back by the air flow meter and the set target air flow value, and determine whether the difference between the actual air flow and the target air flow value is greater than or equal to the preset first flow threshold. , the preset flow threshold in this example is 0.1kg/s;

Step A.3.1), if the difference between the actual air flow and the target flow value is greater than or equal to the preset difference threshold, enter the coarse adjustment stage: control the opening of the first electric control valve to increase the preset first opening threshold, In this example, the preset first opening threshold is 20%;

Step A.3.1), if the difference between the actual air flow and the target flow value is less than the preset difference threshold, enter the fine adjustment stage: control the opening of the second electric control valve to increase the preset second opening threshold, so The preset second opening threshold is smaller than the preset first opening threshold. In this example, the preset second opening threshold is 2%;

Step A.4), repeat step A.3) until the difference between the actual air flow and the target air flow value is less than or equal to the preset second flow threshold. At this time, stop adjusting the first and second electric control valves, and complete Automatic closed-loop control process; in this example, the preset flow threshold is 0.01kg/s.

Please refer to the adjustment method shown in Figure 3 to adjust the fuel flow. The adjustment methods of the three oil circuit systems in the system are the same. Here, the first oil circuit system is taken as an example. The specific operation steps are as follows:

Step B.1), check the initial state of the oil system to ensure that the first electric oil return valve is in a fully open state and the first electric oil outlet valve is in a fully closed state.

Step B.2), after opening the first fuel pump, the fuel flows from the fuel tank into the fuel pump, and then completely flows back to the fuel tank through the oil return valve and oil return pipeline, forming an oil circuit circulation. At this time, the fuel flow rate in the oil outlet pipeline is zero.

Step B.3), the operator sets the target fuel flow value, such as 10g/s.

Step B.4), give the first electric oil delivery valve a small opening, such as 2%, so that the first electric oil delivery valve, the first electric oil return valve, the first fuel flow meter and the corresponding pipelines are filled with fuel , after the fuel flows through the first fuel flow meter, measure the real-time fuel flow, such as 2g/s.

Step B.5), calculate the difference between the actual fuel flow fed back by the first fuel flow meter and the set target fuel flow, and control the opening of the first electric oil delivery valve to increase the preset third opening threshold. In this example The third opening threshold preset in is 20%.

Step B.6), repeat step B.5) until the difference between the actual fuel flow and the target fuel flow is less than or equal to the preset fuel flow threshold. At this time, the opening of the first electric oil delivery valve remains unchanged and the fuel flow is completed. Automatic closed-loop control process of flow; the preset fuel flow threshold in this example is 0.01g/s.

Step B.7), if the opening of the first electric oil delivery valve has reached the maximum, the difference between the actual fuel flow and the target fuel flow value is still greater than the fuel flow threshold, such as when the first electric oil delivery valve is fully open in this example The actual fuel flow value is 8g/s, and the difference from the target fuel flow is 2g/s, entering the oil return control stage.

Step B.8), based on the difference between the actual fuel flow and the target fuel flow, control the opening of the first electric oil return valve to reduce the preset fourth opening threshold. In this example, the preset fourth opening The threshold is 5%.

Step B.9), repeat step B.8) until the difference between the actual fuel flow and the target fuel flow is less than or equal to the preset fuel flow threshold. At this time, the opening of the first electric oil return valve remains unchanged and the fuel flow is completed. Automatic closed-loop control process of flow; the preset fuel flow threshold in this example is 0.01g/s.

Please refer to the adjustment method shown in Figure 4 to adjust the time-varying flow rate of air.

Before adjusting the time-varying flow of air, it is necessary to calibrate the relationship between the air flow change rate and the pressure of the surge tank. The specific steps of the calibration are as follows:

Step C.1), turn on the air compressor, close the first to sixth electric regulating valves and the manual flow regulating valve. At this time, the air enters the pressure stabilizing tank, and the first pressure sensor measures the actual pressure value inside it;

Step C.2), compare the actual pressure value fed back by the first pressure sensor with the preset target pressure value;

Step C.2.1), if the actual pressure value is less than the target pressure value and the difference between the target pressure value and the actual pressure value is greater than the preset differential pressure threshold, control the fifth regulating valve to reduce the preset fifth opening threshold;

Step C.2.2), if the actual pressure value is greater than the target pressure value and the difference between the actual pressure value and the target pressure value is greater than the preset differential pressure threshold, control the fifth regulating valve to increase the preset fifth opening threshold;

Step C.3), repeat step 2) until the absolute value of the difference between the actual pressure value and the target pressure value is less than or equal to the preset differential pressure threshold, and the pressure adjustment is completed. In this example, the preset fifth opening threshold is 10%;

Step C.4), calculate the difference between the actual air flow rate fed back by the air flow meter and the preset target air flow value, and determine whether the difference between the actual air flow rate and the target air flow value is greater than or equal to the preset first flow rate. threshold;

Step C.4.1), if the difference between the actual air flow and the target flow value is greater than or equal to the preset difference threshold, enter the coarse adjustment stage: control the opening of the first electric regulating valve to increase the preset first opening threshold;

Step C.4.2), if the difference between the actual air flow and the target flow value is less than the preset difference threshold, enter the fine adjustment stage: control the opening of the second electric control valve to increase the preset second opening threshold, so The preset second opening threshold is smaller than the preset first opening threshold;

Step C.5), repeat Step C.4) until the difference between the actual air flow and the target air flow value is less than or equal to the preset second flow threshold, and the air flow adjustment is completed. At this time, through the second pressure sensor and the third Three pressure sensors and temperature sensors obtain and record the static pressure, total pressure and temperature of the air;

Step C.6), control the fifth electric regulating valve to increase the preset sixth opening threshold to achieve time-varying flow regulation during the acceleration process. In this example, the preset second opening threshold is 20%;

Step C.7), obtain the static pressure, total pressure and temperature changes of the air through the second pressure sensor, the third pressure sensor and the temperature sensor, and calculate the actual inlet air flow rate with time by combining the gas state equation and the continuity equation. rate of change;

Step C.8), compare the preset target pressure value with the maximum pressure value of the air compressor;

Step C.8.1), if the preset target pressure value is less than the maximum pressure value of the air compressor, compare the calculated actual air flow change rate with the target air flow change rate value;

Step C.8.1.1), if the actual air flow change rate is less than the target air flow change rate value and the difference between the target air flow change rate value and the actual air flow change rate is greater than the preset air flow change rate difference threshold, adjust The preset target pressure value increases the preset first pressure threshold, and jumps to step C.1);

Step C.8.1.2), if the actual air flow change rate is greater than the target air flow change rate value and the difference between the actual air flow change rate and the target air flow change rate value is greater than the preset air flow change rate difference threshold, adjust The preset target pressure value reduces the preset first pressure threshold, and jumps to step C.1);

Step C.8.2), if the preset target pressure value is greater than or equal to the maximum pressure value of the air compressor and the difference between the actual air flow change rate and the target air flow change rate value is greater than the preset air flow change rate difference threshold , close the fifth electric control valve, and use the third electric control valve for time-varying adjustment:

Step C.8.2.1), adjust the preset target pressure value to be less than the maximum pressure value of the air compressor;

Step C.8.2.2), turn on the air compressor, close the first to sixth electric regulating valves and manual flow regulating valve;

Step C.8.2.3), compare the actual pressure value fed back by the first pressure sensor with the target pressure value;

Step C.8.2.3.1), if the actual pressure value is less than the target pressure value and the difference between the target pressure value and the actual pressure value is greater than the preset differential pressure threshold, control the third regulating valve to reduce the preset seventh opening threshold ;

Step C.8.2.3.2), if the actual pressure value is greater than the target pressure value and the difference between the actual pressure value and the target pressure value is greater than the preset differential pressure threshold, control the third regulating valve to increase the preset seventh opening threshold ;

Step C.8.2.4), repeat step C.8.2.3) until the absolute value of the difference between the actual pressure value and the target pressure value is less than or equal to the preset differential pressure threshold, and the pressure adjustment is completed. In this example, the preset The seventh opening threshold is 10%;

Step C.9), calculate the difference between the actual air flow rate fed back by the air flow meter and the preset target air flow value, and determine whether the difference between the actual air flow rate and the target air flow value is greater than or equal to the preset first flow rate. threshold;

Step C.9.1), if the difference between the actual air flow and the target flow value is greater than or equal to the preset difference threshold, enter the coarse adjustment stage: control the opening of the first electric regulating valve to increase the preset first opening threshold;

Step C.9.2), if the difference between the actual air flow and the target flow value is less than the preset difference threshold, enter the fine adjustment stage: control the opening of the second electric control valve to increase the preset second opening threshold, so The preset second opening threshold is smaller than the preset first opening threshold;

Step C.10), repeat step C.9) until the difference between the actual air flow and the target air flow value is less than or equal to the preset second flow threshold, and the air flow adjustment is completed. At this time, through the second pressure sensor and the third Three pressure sensors and temperature sensors obtain and record the static pressure, total pressure and temperature of the air;

Step C.11), control the third electric regulating valve to increase the preset sixth opening threshold to achieve time-varying flow regulation during the acceleration process;

Step C.12), obtain the static pressure, total pressure and temperature changes of the air through the second pressure sensor, the third pressure sensor and the temperature sensor, and calculate the actual inlet air flow rate with time by combining the gas state equation and the continuity equation. rate of change;

Step C.13), compare the calculated actual air flow change rate with the target air flow change rate value;

Step C.13.1), if the actual air flow change rate is less than the target air flow change rate value and the difference between the target air flow change rate value and the actual air flow change rate value is greater than the preset air flow change rate difference threshold, adjust the preset The target pressure value increases the preset first pressure threshold, and jumps to step C.8.2.2);

Step C.13.2), if the actual air flow change rate is greater than the target air flow change rate value and the difference between the actual air flow change rate and the target air flow change rate value is greater than the preset air flow change rate difference threshold, adjust the preset The target pressure value is reduced by the preset first pressure threshold, and jumps to step C.8.2.2).

After completing the above steps, the relationship between the pressure and the air flow change rate can be organized into curves for the fifth electric control valve and the third electric control valve respectively. Before the experiment, the pressure tank can be determined according to the air flow change rate required for the test. pressure.

Please refer to the adjustment method shown in Figure 5 to coordinate the fuel flow and air flow. The specific steps are as follows:

Set the target inlet temperature in the measurement and control system, such as 500°C;

Refer to Figure 2 for air flow adjustment, and control the air flow to the initial flow rate, such as 0.5kg/s;

Refer to Figure 3 to adjust the fuel flow of the first oil circuit system. Given an initial fuel flow, use the igniter to ignite the gas heater. The temperature sensor measures the real-time temperature, such as 400°C, and compares the actual temperature with the target temperature. Difference calculation;

Gradually increase the fuel flow value in the measurement and control system, adjust the fuel flow as shown in Figure 3, and measure the temperature in real time and feed it back to the measurement and control system until the temperature reaches the set target value. Record the fuel flow and air flow at this time and calculate the fuel-air ratio. ;

Refer to Figure 4 for time-varying adjustment of air flow. The incoming flow enters the time-varying flow stage, and the air flow continues to change with time, forming an air flow characteristic curve;

According to the air flow at different times and the previously calculated oil-gas ratio, the corresponding fuel flow is calculated to obtain the fuel flow change curve;

The flow control module adjusts the opening of the first electric oil delivery valve and the first electric oil return valve in real time according to the fuel flow change curve to control changes in fuel flow;

As the air and fuel flow rates vary in synergy, the heating value of the heater remains constant because the oil-to-air ratio remains constant.

It can be understood by one of ordinary skill in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in general dictionaries are to be understood to have meanings consistent with their meaning in the context of the prior art, and are not to be taken in an idealized or overly formal sense unless defined as herein. explain.

The above-mentioned specific embodiments further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (4)

1. The regulation and control system for the time-varying flow down-flow combustion research is characterized by comprising an air compressor, a surge tank, first to sixth electric regulating valves, a manual flow regulating valve, an air flowmeter, a 500 ℃ electric heater, an electric butterfly valve, first to second safety valves, a 200 ℃ electric heater, a gas warmer, an air blender, a temperature sensor, first to third pressure sensors, a combustion chamber, a vacuum tank, a vacuum pressure gauge, a vacuum pump, a fuel tank, first to third fuel pumps, first to third electric oil outlet valves, first to third manual oil outlet valves, first to third electric oil return valves, first to third manual oil return valves, first to third fuel flow meters and first to third oil supply pressure gauges;

the pressure stabilizing tank comprises an inlet, a pressure measuring point and an outlet;

the air blender comprises first to third inlets and an outlet, wherein the air is used for being blended by the first to third inlets and then discharged from the outlet;

the fuel gas warmer comprises an air inlet, an air outlet and a fuel oil inlet, and is used for heating air entering from the air inlet and then discharging the air from the air outlet;

The combustion chamber comprises an air inlet, an air outlet, a first fuel inlet and a second fuel inlet;

the fuel tank comprises first to third inlets and first to third outlets;

the vacuum tank comprises an air inlet, a pressure measuring point, a first air outlet and a second air outlet;

the inlet of the air compressor is connected with outside air, and the outlet of the air compressor is connected with an inlet pipeline of the pressure stabilizing tank;

the outlet of the pressure stabilizing tank is respectively connected with one end pipeline of a first electric regulating valve, a second electric regulating valve, a manual flow regulating valve and an air flowmeter, the other ends of the first electric regulating valve, the second electric regulating valve and the manual flow regulating valve are respectively connected with outside air, and the other ends of the air flowmeter are respectively connected with one end of a third electric regulating valve, one end of a fourth electric regulating valve, one end of a fifth electric regulating valve and an inlet pipeline of a second safety valve;

the first pressure sensor is arranged at a pressure measuring point of the pressure stabilizing tank;

the other end of the third electric regulating valve, the 500 ℃ electric heater and one end of the electric butterfly valve are connected in sequence through pipelines;

the other end of the electric butterfly valve is connected with a first inlet pipeline of the air blender;

The other end of the fourth electric regulating valve is respectively connected with the second inlet of the air blender and the inlet pipeline of the first safety valve;

the other end of the fifth electric regulating valve, the 200 ℃ level electric heater and the air inlet of the gas warmer are connected in a pipeline way in sequence;

the third inlet of the air blender is connected with the outlet pipeline of the gas warmer, and the outlet of the air blender is connected with the air inlet pipeline of the combustion chamber;

the temperature sensor, the second pressure sensor and the third pressure sensor are all arranged in a pipeline between the outlet of the air blender and the air inlet of the combustion chamber, wherein the temperature sensor is used for measuring the temperature of the position where the temperature sensor is located, the second pressure sensor is used for measuring the static pressure of the position where the temperature sensor is located, and the third pressure sensor is used for measuring the total pressure of the position where the temperature sensor is located;

the air inlet of the vacuum tank is connected with an air outlet pipeline of the combustion chamber, the first air outlet is connected with one end pipeline of the sixth electric regulating valve, and the second air outlet is connected with one end pipeline of the vacuum pump;

the other end of the sixth electric regulating valve and the other end of the vacuum pump are connected with outside air;

the vacuum pressure gauge is arranged at a pressure measuring point of the vacuum tank and is used for measuring the pressure in the vacuum tank;

The first to third outlets of the fuel oil tank are respectively connected with inlets of the first to third fuel pumps in one-to-one correspondence;

the outlet of the first fuel pump is respectively connected with one end of the first electric oil outlet valve and one end of the first electric oil return valve through pipelines;

the other end of the first electric oil outlet valve, the first manual oil outlet valve and the fuel inlet of the fuel gas heater are connected through pipelines in sequence;

the other end of the first electric oil return valve, the first manual oil return valve and a first inlet of the fuel oil tank are connected through pipelines in sequence;

the first fuel flow meter and the first fuel supply pressure meter are arranged in a pipeline between the first manual oil outlet valve and the fuel inlet of the fuel gas heater and are respectively used for measuring the fuel flow and the oil pressure of the position where the first manual oil outlet valve and the fuel inlet of the fuel gas heater are positioned;

the outlet of the second fuel pump is respectively connected with one end of the second electric oil outlet valve and one end of the second electric oil return valve through pipelines;

the other end of the second electric oil outlet valve, the second manual oil outlet valve and the first fuel inlet of the combustion chamber are connected through pipelines in sequence;

the other end of the second electric oil return valve, the second manual oil return valve and a second inlet of the fuel oil tank are connected through pipelines in sequence;

the second fuel flow meter and the second fuel supply pressure meter are arranged in a pipeline between the second manual oil outlet valve and the fuel inlet of the fuel gas heater and are respectively used for measuring the fuel flow and the oil pressure of the position where the second manual oil outlet valve and the fuel inlet of the fuel gas heater are positioned;

The outlet of the third fuel pump is respectively connected with one end of the third electric oil outlet valve and one end of the third electric oil return valve through pipelines;

the other end of the third electric oil outlet valve, the third manual oil outlet valve and the first fuel inlet of the combustion chamber are connected through pipelines in sequence;

the other end of the third electric oil return valve, the third manual oil return valve and a third inlet of the fuel oil tank are connected through pipelines in sequence;

the third fuel flow meter and the third fuel supply pressure meter are arranged in a pipeline between the third manual oil outlet valve and the fuel inlet of the fuel gas warmer and are respectively used for measuring the fuel flow and the oil pressure of the position where the third manual oil outlet valve and the fuel gas warmer are located.

2. The regulation and control system for time-varying incoming flow combustion studies of claim 1, wherein the first electrically operated regulator valve has a line path of DN150 and the second and third electrically operated regulator valves have a line path of DN100.

3. Air flow regulation method based on a regulation system for time-varying incoming flow combustion studies according to claim 1, characterized by comprising the steps of:

step A.1), setting a target air flow value by an operator;

step A.2), after the air flows through the air flowmeter, the air flowmeter measures the actual air flow in the pipeline in real time;

Step A.3), calculating a difference value between the actual air flow fed back by the air flow meter and a set target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is larger than or equal to a preset first flow threshold value;

step A.3.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

step a.3.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step a.4), repeating step a.3) until the difference between the actual air flow and the target air flow value is less than or equal to a preset second flow threshold.

4. An air time-varying flow regulation method based on a regulation system for time-varying incoming flow combustion studies as claimed in claim 1, characterized by comprising the steps of:

step C.1), an air compressor is started, the first to sixth electric regulating valves and the manual flow regulating valve are closed, at the moment, air enters the pressure stabilizing tank, and the first pressure sensor measures the actual pressure value in the pressure stabilizing tank;

Step C.2), comparing the actual pressure value fed back by the first pressure sensor with a preset target pressure value;

step C.2.1), if the actual pressure value is smaller than the target pressure value and the difference value between the target pressure value and the actual pressure value is larger than a preset differential pressure threshold value, controlling a fifth regulating valve to reduce a preset fifth opening threshold value;

step C.2.2), if the actual pressure value is larger than the target pressure value and the difference value between the actual pressure value and the target pressure value is larger than a preset differential pressure threshold value, controlling a fifth regulating valve to increase a preset fifth opening threshold value;

step C.3), repeating the step 2) until the absolute value of the difference between the actual pressure value and the target pressure value is smaller than or equal to a preset differential pressure threshold value, and finishing pressure adjustment, wherein the preset fifth opening threshold value is 10%;

step C.4), calculating a difference value between the actual air flow fed back by the air flow meter and a preset target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is larger than or equal to a preset first flow threshold value;

step C.4.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

Step c.4.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step C.5), repeatedly executing the step C.4) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, completing air flow adjustment, and obtaining and recording the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor;

step C.6), controlling a fifth electric regulating valve to increase a preset sixth opening threshold value, and realizing time-varying flow regulation in an acceleration process, wherein the preset second opening threshold value is 20%;

step C.7), obtaining the change of the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor, and calculating to obtain the actual change rate of the inlet air flow along with time by combining a gas state equation and a continuity equation;

step C.8), comparing a preset target pressure value with a maximum pressure value of the air compressor;

Step C.8.1), if the preset target pressure value is smaller than the maximum pressure value of the air compressor, comparing the calculated actual air flow rate and the target air flow rate value;

step C.8.1.1), if the actual air flow rate is smaller than the target air flow rate value and the difference between the target air flow rate value and the actual air flow rate is larger than the preset air flow rate difference threshold, adjusting the preset target pressure value to increase the preset first pressure threshold, and jumping to execute the step C.1);

step C.8.1.2), if the actual air flow rate is greater than the target air flow rate value and the difference between the actual air flow rate and the target air flow rate value is greater than the preset air flow rate difference threshold, adjusting the preset target pressure value to reduce the preset first pressure threshold, and jumping to execute the step C.1);

step C.8.2), if the preset target pressure value is greater than or equal to the maximum pressure value of the air compressor and the difference value between the actual air flow rate and the target air flow rate value is greater than the preset difference threshold value of the air flow rate, closing the fifth electric regulating valve, and performing time-varying regulation by adopting the third electric regulating valve:

Step C.8.2.1), adjusting a preset target pressure value to be smaller than the maximum pressure value of the air compressor;

step C.8.2.2), opening the air compressor, and closing the first to sixth electric regulating valves and the manual flow regulating valve;

step C.8.2.3), comparing the actual pressure value fed back by the first pressure sensor with a target pressure value;

step C.8.2.3.1), if the actual pressure value is smaller than the target pressure value and the difference value between the target pressure value and the actual pressure value is larger than a preset differential pressure threshold value, controlling the third regulating valve to reduce a preset seventh opening degree threshold value;

step C.8.2.3.2), if the actual pressure value is larger than the target pressure value and the difference value between the actual pressure value and the target pressure value is larger than a preset differential pressure threshold value, controlling the third regulating valve to increase a preset seventh opening degree threshold value;

step C.8.2.4), repeating the step C.8.2.3) until the absolute value of the difference between the actual pressure value and the target pressure value is less than or equal to a preset differential pressure threshold value, and completing pressure regulation, wherein the preset seventh opening degree threshold value is 10%;

step C.9), calculating a difference value between the actual air flow fed back by the air flow meter and a preset target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is greater than or equal to a preset first flow threshold value;

Step C.9.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

step c.9.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step c.10), repeatedly executing the step C.9) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, completing air flow adjustment, and obtaining and recording the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor;

step C.11), controlling a third electric regulating valve, and increasing a preset sixth opening threshold value to realize time-varying flow regulation in the acceleration process;

step C.12), obtaining the change of the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor, and calculating to obtain the actual change rate of the inlet air flow along with time by combining a gas state equation and a continuity equation;

Step C.13), comparing the calculated actual air flow rate with a target air flow rate value;

step C.13.1), if the actual air flow rate is smaller than the target air flow rate value and the difference between the target air flow rate value and the actual air flow rate is larger than the preset air flow rate difference threshold, adjusting the preset target pressure value to increase the preset first pressure threshold, and jumping to execute the step C.8.2.2);

step c.13.2), if the actual air flow rate is greater than the target air flow rate value and the difference between the actual air flow rate and the target air flow rate value is greater than the preset air flow rate difference threshold, adjusting the preset target pressure value to reduce the preset first pressure threshold, and jumping to execute step c.8.2.2).