CN110793777B - A test device for simulating the preheating effect of the intake air in the diesel engine intake port environment - Google Patents
A test device for simulating the preheating effect of the intake air in the diesel engine intake port environment Download PDFInfo
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- 239000007789 gas Substances 0.000 claims description 22
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- 239000001301 oxygen Substances 0.000 claims description 18
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- 229910001220 stainless steel Inorganic materials 0.000 description 3
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- 238000004140 cleaning Methods 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
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- G01M15/04—Testing internal-combustion engines
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Abstract
本发明实施例公开一种模拟柴油机进气道环境进气预热效果的测试装置。该装置通过将空气冷却器与风机的进气口连接的方式，使得外部空气经过空气冷却器冷却至预设温度后经过风机加速后进入进气道，可以准确模拟出进入柴油机进气道内的特定温度的低温气流，通过将风机的出气口与气流流入管道的进气口连接并在气流引导段管道内设置多个气流挡块的方式，可以对不同湍流程度的柴油机进气气流进行模拟，通过将变频器与风机的电源连接并在气流引导段管道的进气口处安装风速仪的方式，可以准确模拟进入柴油机进气道内的气流的流速，应用本发明实施例提供的方案，能够准确模拟出柴油机的进气道环境，使得准确测定进气预热装置在低环境温度下的预热效果。
The embodiment of the invention discloses a test device for simulating the preheating effect of the intake air in the diesel engine intake port environment. The device connects the air cooler with the air intake of the fan, so that the outside air is cooled to a preset temperature by the air cooler and then accelerated by the fan to enter the intake port, which can accurately simulate the specific air entering the intake port of the diesel engine. For low-temperature airflow, by connecting the air outlet of the fan to the air inlet of the airflow inflow duct and setting multiple airflow blocks in the airflow guide section duct, the diesel engine intake airflow with different turbulence levels can be simulated. The method of connecting the frequency converter with the power supply of the fan and installing an anemometer at the air inlet of the airflow guide section pipeline can accurately simulate the flow rate of the airflow entering the diesel engine intake duct, and the solution provided by the embodiment of the present invention can be accurately simulated. It can accurately measure the preheating effect of the intake air preheating device under low ambient temperature.
Description
Technical Field
The invention relates to the technical field of cold-start intake preheating tests of diesel engines, in particular to a test device for simulating an intake preheating effect of an air inlet channel environment of a diesel engine.
Background
For a diesel engine, if the working performance of the intake air preheating device is not good, the intake air loss and the combustion efficiency are reduced to a certain extent, the cold starting performance of the diesel engine is influenced to a certain extent, and the diesel engine cannot be started in a severe condition, so that the test on the preheating effect of the intake air preheating device is very critical to the development of the intake air preheating device in the experimental performance research of the diesel engine.
At present, the testing arrangement that tests intake preheating device's preheating effect is imperfect, can't the accurate intake duct environment that simulates out the diesel engine, for example: the fan brings indoor gas into the air inlet channel in the existing testing device, and because the temperature of cold start is generally lower than the room temperature, the low-temperature air flow entering the air inlet channel of the diesel engine cannot be accurately simulated, and an unimpeded object is arranged in the air inlet channel of the existing testing device, so that the turbulence degree of the air flow entering the air inlet channel is basically unchanged, and the turbulence degree of the air flow in the air inlet channel of the diesel engine cannot be accurately simulated.
Because the air inlet channel environment of the diesel engine cannot be accurately simulated by the conventional testing device, the preheating effect of the air inlet preheating device at low ambient temperature cannot be accurately measured by the testing device, and certain research parameters are difficult to provide for later development of the air inlet preheating device with higher temperature control precision. Therefore, in order to improve the temperature control precision of the intake air preheating device of the diesel engine, a testing device which can accurately simulate the air inlet channel environment of the diesel engine so as to accurately measure the intake air preheating effect is urgently needed.
Disclosure of Invention
The invention provides a testing device for simulating an intake preheating effect of an air inlet passage environment of a diesel engine, which is used for accurately measuring the preheating effect of an intake preheating device at low ambient temperature. The specific technical scheme is as follows:
in a first aspect, the present invention provides a testing apparatus for simulating an intake preheating effect in an air intake channel environment of a diesel engine, including:
the device comprises an air cooler, an anemograph, a frequency converter, a fan, an airflow inflow pipeline, a plurality of airflow stoppers, an intake preheating device, an intake channel, an intake temperature sensor, an exhaust temperature sensor, a heating time controller and a display device, wherein the intake channel comprises an airflow guide section pipeline, a heating section pipeline and an airflow outflow section pipeline, and the diameter of the airflow inflow pipeline is positively related to the turbulence degree of the airflow;
the air cooler is connected with an air inlet of the fan, an air outlet of the fan is connected with an air inlet of the airflow inflow pipeline, an air outlet of the airflow inflow pipeline is connected with an air inlet of the airflow guiding section pipeline, an air outlet of the airflow guiding section pipeline is connected with an air inlet of the heating section pipeline, an air outlet of the heating section pipeline is connected with an air inlet of the airflow outflow section pipeline, an air outlet of the airflow outflow section pipeline is communicated with the external environment, the frequency converter is connected with a power supply of the fan, the air inlet preheating device is connected with the heating time controller, and the anemoscope, the air inlet temperature sensor and the air outlet temperature sensor are all connected with the display device;
the air inlet of the air flow guiding section pipeline is provided with the air inlet temperature sensor and the anemoscope, the air flow guiding section pipeline is internally provided with the air flow stop blocks, the air inlet preheating device is detachably installed on the heating section pipeline, the air inlet preheating device heats air entering the heating section pipeline, and the air outlet of the air flow outlet section pipeline is provided with the air outlet temperature sensor.
Optionally, the air inlet duct is a square duct, the heating section duct includes a first cover plate and a first base, the first base includes two parallel side walls and a bottom surface vertically connected to the two side walls, the airflow outflow section duct includes a second cover plate and a second base, and the second base includes two parallel side walls and a bottom surface vertically connected to the two side walls;
the first cover plate is detachably mounted on the upper surfaces of the two side walls of the first base, and the second cover plate is detachably mounted on the upper surfaces of the two side walls of the second base.
Optionally, the intake air preheating device comprises an oil sprayer, an oil sprayer adapter, a high-temperature ignition rod, an upper fixing plate, a lower fixing plate and a support pillar;
the fuel injector is arranged on the fuel injector adapter, the fuel injector adapter is arranged on the first cover plate, one end of the high-temperature ignition rod is fixed between the upper fixing plate and the lower fixing plate, one end of the supporting column is fixedly connected to the lower fixing plate, the other end of the supporting column is fixedly connected to the bottom surface of the first base, and the high-temperature ignition rod ignites fuel sprayed by the fuel injector to form flame to heat gas entering the heating section pipeline.
Optionally, the intake air preheating device further comprises a magnet, the magnet is adhered to the other end of the supporting column, and the other end of the supporting column is adsorbed to the bottom surface of the first base through the magnet.
Optionally, the testing device further includes optical glass, and the two side walls of the first base and the two side walls of the second base are both provided with the optical glass.
Optionally, the airflow outflow section pipeline comprises a first airflow outflow section pipeline, a second airflow outflow section pipeline and a third airflow outflow section pipeline;
the air outlet of the heating section pipeline is connected with the air inlet of the first airflow outflow section pipeline, the air outlet of the first airflow outflow section pipeline is connected with the air inlet of the second airflow outflow section pipeline, the air outlet of the second airflow outflow section pipeline is connected with the air inlet of the third airflow outflow section pipeline, and the air outlet of the third airflow outflow section pipeline is communicated with the external environment;
the two side walls of the first airflow outflow section pipeline, the two side walls of the second airflow outflow section pipeline and the two side walls of the third airflow outflow section pipeline are all provided with the optical glass.
Optionally, the testing device further comprises an oxygen sensor, and the oxygen sensor is installed at an air outlet of the airflow outflow section pipeline.
Optionally, the intake air preheating device comprises an electric heating rod and a fixing device;
the electric heating rod is arranged on the fixing device, the fixing device is arranged on the bottom surface of the first base, and the electric heating rod heats gas entering the heating section pipeline.
Optionally, the airflow block comprises a square airflow block and/or a square airflow block with a square hole in the middle.
Optionally, the length of the airflow guiding section pipeline is greater than a preset length threshold.
From the above, in the embodiment, the air cooler is connected to the air inlet of the fan, so that the external air is cooled to the preset temperature by the air cooler and then enters the air inlet channel after being accelerated by the fan, the low-temperature air flow with the specific temperature entering the air inlet channel of the diesel engine can be accurately simulated, the air inlet of the diesel engine with different turbulence degrees can be simulated by connecting the air outlet of the fan with the air inlet of the air flow inflow pipeline and arranging the plurality of air flow stoppers in the air flow guide section pipeline, the frequency converter is connected to the power supply of the fan, the anemoscope is arranged at the air inlet of the air flow guide section pipeline, so that the frequency converter changes the flow velocity of the air flow entering the air inlet channel after being accelerated by the fan, the flow velocity is monitored by the anemoscope, and the flow velocity of the air flow entering the air inlet channel of the diesel engine can be accurately simulated, therefore, the air inlet channel environment of the diesel engine can be accurately simulated, the preheating effect of the air inlet preheating device at low ambient temperature can be accurately measured, and certain research parameters can be provided for developing the air inlet preheating device with high temperature control precision in the later stage. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
The innovation points of the embodiment of the invention comprise:
1. the low-temperature air flow with specific temperature entering the air inlet channel of the diesel engine can be accurately simulated by connecting the air cooler with the air inlet of the fan, the external air is cooled to the preset temperature by the air cooler and then enters the air inlet channel after being accelerated by the fan, the air inlet of the air inlet channel of the diesel engine can be simulated by connecting the air outlet of the fan with the air inlet of the air flow inflow pipeline and arranging a plurality of air flow stop blocks in the air flow guide section pipeline, the air inlet flow of the diesel engine with different turbulence degrees can be simulated, the frequency converter can change the flow speed of the air flow entering the air inlet channel after being accelerated by the fan by connecting the frequency converter with the power supply of the fan and installing an anemometer at the air inlet of the air flow guide section pipeline, the flow speed of the air flow entering the air inlet channel of the diesel engine can be accurately simulated by monitoring the flow speed by the anemometer, therefore, the preheating effect of the air inlet preheating device at low ambient temperature can be accurately measured, and certain research parameters can be provided for later development of the air inlet preheating device with higher temperature control precision.
2. Through the mode with first apron demountable installation in the upper surface of two lateral walls of first base, make the heating section pipeline can realize the quick detach, can pull down first apron from first base fast, so that installation preheating device and heating section pipeline clear up, through the mode with the upper surface of second apron demountable installation in two lateral walls of second base, make the airflow section pipeline can realize the quick detach, can pull down the second apron from the second base fast, so that clear up airflow section pipeline.
3. Through setting up optical glass, can set up test device such as high-speed direct-photographing light path, schlieren shooting light path, observe preheating device's the running state that admits air, can look over the condition of flame in heating section pipeline and the air current outflow section pipeline, conveniently adjust the fuel injection quantity and the heating time of sprayer based on the condition of flame to improve preheating device's that admits air preheating device's preheating effect, reached and carried out optical diagnosis's purpose to preheating device that admits air.
4. The mode of installing the oxygen sensor through the gas outlet department at air current outflow section pipeline can detect the oxygen content of the air current after preheating through the preheating device that admits air to confirm whether the oxygen content that detects can be used for the diesel engine to start, reach the purpose of monitoring the oxygen content of the air current after preheating.
5. The bottom surface of first base is fixed in with the support column through magnetic force, has guaranteed the heating process in, the rigidity of high temperature ignition stick is unchangeable, simultaneously, can also adjust the position of high temperature ignition stick through the mode of adjustment magnet position, has improved the convenience of adjusting the position of high temperature ignition stick in the heating section pipeline.
6. Through setting up the mode into the multistage with airflow outflow section pipeline, reduced every section optical glass's length, improved optical glass's rigidity, avoided optical glass to damage in the use, simultaneously, can only change this section optical glass after certain section optical glass damages can.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of some embodiments of the invention. For a person skilled in the art, without inventive effort, further figures can be obtained from these figures.
Fig. 1 is a schematic structural diagram of a test device for simulating an intake preheating effect in an intake passage environment of a diesel engine according to an embodiment of the present invention.
In fig. 1, 1 is an anemograph, 2 is a fan, 3 is an airflow inflow pipeline, 4 is an intake preheating device, 41 is an oil injector, 42 is a high-temperature ignition rod, 43 is a support column, 5 is an intake passage, 51 is an airflow guiding section pipeline, 52 is a heating section pipeline, 53 is an airflow outflow section pipeline, 531 is a first airflow outflow section pipeline, 532 is a second airflow outflow section pipeline, 533 is a third airflow outflow section pipeline, 6 is an intake temperature sensor, 7 is an outlet temperature sensor, 8 is optical glass, and 9 is an oxygen sensor.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
It is to be noted that the terms "comprises" and "comprising" and any variations thereof in the embodiments and drawings of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a testing device for simulating an intake preheating effect of an air inlet passage environment of a diesel engine, which can accurately simulate the air inlet passage environment of the diesel engine so as to accurately measure the preheating effect of the intake preheating device at a low ambient temperature and provide help for developing an intake preheating device with higher temperature control precision at a later stage. The following provides a detailed description of embodiments of the invention.
Fig. 1 is a schematic structural diagram of a test device for simulating an intake preheating effect in an intake passage environment of a diesel engine according to an embodiment of the present invention.
Referring to fig. 1, a testing device for simulating an intake preheating effect in an air inlet channel environment of a diesel engine provided by the embodiment of the invention comprises an air cooler, an anemograph 1, a frequency converter, a fan 2, an airflow inflow pipeline 3, a plurality of airflow stoppers, an intake preheating device 4, an air inlet channel 5, an intake temperature sensor 6, an outlet temperature sensor 7, a heating time controller and a display device. The air intake duct 5 includes an air flow guide-section duct 51, a heating-section duct 52, and an air flow outflow-section duct 53.
Illustratively, the material of the airflow inflow pipe 3 and the material of the air inlet 5 are both stainless steel, and the maximum flow rate of the fan 2 is 500 kg/h.
Since the cold start temperature is typically below room temperature, an air cooler is connected to the air inlet of the fan 2 in order to accurately simulate the low temperature air flow into the diesel engine intake.
With continued reference to fig. 1, in order to accurately simulate the turbulence degree of the air flow in the air inlet channel of the diesel engine, the air outlet of the fan 2 is connected to the air inlet of the air flow inflow pipe 3, the air outlet of the air flow inflow pipe 3 is connected to the air inlet channel 5, that is, to the air inlet of the air flow guiding section pipe 51, and a plurality of air flow stoppers are disposed in the air flow guiding section pipe 51. For the air inlet channel 5, the air outlet of the air flow guiding section pipeline 51 is connected with the air inlet of the heating section pipeline 52, the air outlet of the heating section pipeline 52 is connected with the air inlet of the air flow outflow section pipeline 53, and the air outlet of the air flow outflow section pipeline 53 is communicated with the external environment.
Because air cooler is connected with the air inlet of fan 2, make outside air through air cooler cooling to after the default temperature like this, get into air current inflow pipeline 3 after fan 2 accelerates, then get into air current guide section pipeline 51, consequently, can accurately simulate out the low temperature air current that gets into the specific temperature in the diesel engine intake duct.
In order to stabilize the air flow coming out of the fan 2, the length of the air flow guide section duct 51 is set to be greater than a preset length threshold.
Since the diameter of the air inflow conduit 3 is positively correlated to the degree of turbulence of the air, different degrees of turbulence of the air entering the diesel engine intake duct can be simulated by connecting air inflow conduits 3 of different diameters between the fan 2 and the air guiding section conduit 51, which for the purposes of the present embodiment refers to the degree of turbulence of the air flowing in the heating section conduit 52.
For example: the airflow inflow pipeline 3 with a smaller diameter is connected between the fan 2 and the airflow guiding section pipeline 51, so that the turbulence degree of the airflow entering the airflow guiding section pipeline 51 through the airflow inflow pipeline 3 is slower, and the turbulence degree of the airflow entering the heating section pipeline 52 through the airflow guiding section pipeline 51 is slower; or, the airflow inflow pipe 3 with a large diameter is connected between the fan 2 and the airflow guiding-section pipe 51, the turbulence degree of the airflow entering the airflow guiding-section pipe 51 through the airflow inflow pipe 3 is rapid, so that the turbulence degree of the airflow entering the heating-section pipe 52 through the airflow guiding-section pipe 51 is rapid.
The on-way resistance and the flowing direction of the airflow can be changed by arranging a plurality of airflow stoppers in the airflow guide section pipeline 51, different turbulence degrees of the airflow are simulated, the arrangement positions of the airflow stoppers are determined according to actual conditions, and the airflow stoppers can be airflow stoppers with different shapes and sizes.
For example, the airflow block may include a square airflow block and/or a square airflow block with a square hole in the middle and/or a rectangular airflow block with a square hole in the middle.
In order to simulate different flow rates of air flow in an air inlet channel of a diesel engine, a frequency converter is arranged and connected with a power supply of a fan 2, the frequency of the power supply of the fan 2 is changed through the frequency converter to change the rotating speed of the fan 2, so that the flow rate of the air flow entering a pipeline 3 after the air flow is accelerated by the fan 2 is changed, and the flow rate of the air flow entering the air flow guide section pipeline 51 through the air flow entering the pipeline 3 is changed.
Because the air flow entering the air flow inflow pipeline 3 after being accelerated by the fan 2 and then entering the air flow guiding section pipeline 51 may not reach the flow rate to be reached by the fan 2, the anemoscope 1 is installed at the air inlet of the air flow guiding section pipeline 51, and the flow rate of the air flow entering the air flow guiding section pipeline 51 is detected by the anemoscope 1.
In order to determine whether the detected flow rate reaches the flow rate to be reached by the fan 2, the anemoscope 1 is further required to be connected with the display device, the display device is used for checking whether the detected flow rate reaches the flow rate to be reached by the fan 2, if the detected flow rate does not reach the flow rate, the frequency of the power supply of the fan 2 can be adjusted through the frequency converter, and the anemoscope 1 is used for detecting the flow rate of the air flow entering the air flow guiding section pipeline 51 to realize the control of the flow rate.
With continued reference to fig. 1, in order to preheat the gas entering the heating section pipeline 52, the intake preheating device 4 is detachably mounted on the heating section pipeline 52, and the intake preheating device 4 is connected to the heating time controller, the intake preheating device 4 heats the gas entering the heating section pipeline 52, and the heating time of the intake preheating device 4 heating the gas entering the heating section pipeline 52 is controlled by the heating time controller.
With continued reference to fig. 1, in order to determine the preheating degree of the inlet preheating device 4 to the gas entering the heating section pipeline 52, an inlet temperature sensor 6 is installed at the inlet of the gas flow guiding section pipeline 51, an outlet temperature sensor 7 is installed at the outlet of the gas flow outlet section pipeline 53, and both the inlet temperature sensor 6 and the outlet temperature sensor 7 are connected to a display device.
Can look over the temperature of the inlet air current of air inlet department of air current guide section pipeline 51 through display device to and the temperature of the outlet air current of air outlet department of air current outflow section pipeline 53, when the temperature of the outlet air current reaches the minimum temperature that the diesel engine starts, realized that the inlet air preheats, at this moment, if the temperature difference of the temperature of inlet air current and the temperature of the outlet air current is great, it is higher to explain the temperature rise of the air current after preheating device 4 heats that admits air, it is better to preheat the effect.
It can be known from the above content that in the present embodiment, after the external air is cooled to the preset temperature by the air cooler through the air inlet of the fan 2, the external air enters the air inlet after being accelerated by the fan 2, the low-temperature air flow with the specific temperature entering the air inlet of the diesel engine can be accurately simulated, the air outlet of the fan 2 is connected with the air inlet of the air flow inflow pipeline 3, and a plurality of air flow stoppers are arranged in the air flow guiding section pipeline 51, the diesel engine intake air flow with different turbulence degrees can be simulated, the frequency converter is connected with the power supply of the fan 2, and the anemoscope 1 is arranged at the air inlet of the air flow guiding section pipeline 51, so that the frequency converter changes the flow rate of the air flow entering the air inlet after being accelerated by the fan 2, and the flow rate is monitored by the anemoscope, the flow rate of the air flow entering the air inlet of the diesel engine can be accurately simulated, therefore, the air inlet channel environment of the diesel engine can be accurately simulated, the preheating effect of the air inlet preheating device at low ambient temperature can be accurately measured, and certain research parameters can be provided for developing the air inlet preheating device with high temperature control precision in the later stage.
Meanwhile, the test device provided by the embodiment of the invention can simulate the air inlet channel environments of diesel engines of different models, so that the preheating effect of the air inlet preheating devices of the diesel engines of different models can be tested, a corresponding test device does not need to be arranged for each type of diesel engine, and the research and development process of the air inlet preheating devices is simplified.
The air inlet 5 in the embodiment of the present invention is a square pipe, and the size of the air inlet 5 is, for example, 100mm × 100mm × 1000 mm.
In order to facilitate installation of the intake air preheating device 4 and cleaning of the heating section duct 52, the heating section duct 52 may include a first cover plate and a first base, the first base includes two parallel side walls and a bottom surface vertically connected to the two side walls, and the first cover plate is detachably mounted on the upper surfaces of the two side walls of the first base.
In order to facilitate cleaning of the airflow outflow section duct 53, the airflow outflow section duct 53 may include a second cover plate and a second base, the second base includes two parallel side walls and a bottom surface vertically connected to the two side walls, and the second cover plate is detachably mounted on the upper surfaces of the two side walls of the second base.
From this, through the mode with first apron demountable installation in the upper surface of two lateral walls of first base, make heating section pipeline 52 can realize the quick detach, can pull down first apron from first base fast, so that installation preheating device 4 and heat section pipeline 52 and clear up, through the mode with second apron demountable installation in the upper surface of two lateral walls of second base, make air current outflow section pipeline 53 can realize the quick detach, can pull down the second apron from the second base fast, so that clear up air current outflow section pipeline 53.
In the case where the air inlet duct 5 is a square duct, the heating section duct 52 includes a first cover plate and a first base, and the airflow outlet section duct 53 includes a second cover plate and a second base, the intake air preheating device 4 that can be carried by the embodiment of the present invention includes, but is not limited to, the following two types:
the first method comprises the following steps: flame preheating type air inlet preheating device
With continued reference to fig. 1, the first intake air preheating device 4 may include an injector 41, an injector adapter, a high-temperature ignition rod 42, an upper fixing plate, a lower fixing plate, and a support column 43.
Sprayer 41 installs in the sprayer adapter, the sprayer adapter is installed in first apron, the one end of high temperature ignition stick is fixed in between upper fixed plate and the bottom plate, the one end fixed connection of support column 43 is in the bottom plate of bottom plate, other end fixed connection is in the bottom surface of first base, that is to say, the one end of high temperature ignition stick is cliied to upper fixed plate and bottom plate, the other end exposes outward, can change the contained angle of sprayer 41 and vertical direction through the sprayer adapter, can change the distance between sprayer 41 and the high temperature ignition stick through the length that changes support column 43, make sprayer 41 can aim at the high temperature ignition stick, the high temperature ignition stick ignites the fuel formation flame that sprayer 41 spun and heats the gas that gets into in the heating segment pipeline 52.
For example, injector 41 may be a single-injection injector, supporting diesel injection at injection pressures within 10bar, with a minimum pulse width of 250 μ s and a minimum injection interval of 15 ms. The high-temperature ignition rod can be a silicon nitride ignition rod, the highest surface temperature is 1200 ℃, the material of the upper fixing plate and the material of the lower fixing plate can be stainless steel, the material of the supporting column 43 can be zirconia ceramic, the zirconia ceramic material can reduce the heat transfer of the high-temperature ignition rod to the heating section pipeline 52 through the supporting column 43, and the influence on the heating effect of the air inlet preheating device 4 is avoided.
Therefore, fuel is sprayed to the high-temperature ignition rod through the fuel injector 41, the high-temperature ignition rod ignites the fuel sprayed by the fuel injector 41 to form a flame to heat gas entering the heating section pipeline 52, and intake preheating is achieved.
Because the material of air current inflow pipeline 3 and the material of intake duct 5 are the stainless steel, consequently, in order to with support column 43 fixed connection in the bottom surface of first base, preheating device 4 that admits air can also include magnet, and magnet pastes in the other end of support column 43, and the other end of support column 43 passes through magnet and adsorbs the bottom surface of first base.
Illustratively, the magnet may be a rubidium-iron-boron strong magnet.
From this, be fixed in the bottom surface of first base with support column 43 through magnetic force, guaranteed the heating in-process, the rigidity of high temperature ignition rod is unchangeable, simultaneously, can also adjust the position of high temperature ignition rod through the mode of adjustment magnet position, improved the convenience of adjustment high temperature ignition rod position in heating section pipeline 52.
With reference to fig. 1, since the high temperature ignition rod ignites the fuel sprayed from the fuel injector 41 to form a flame, and the flame may extend to the airflow flowing-out section pipe 53 along the airflow flowing direction, in order to observe the color of the flame to check the combustion condition, and whether the fuel is sprayed properly or not, or whether the fuel injector 41 is aligned with the high temperature ignition rod, the testing apparatus for simulating the intake preheating effect of the diesel engine intake channel environment according to the embodiment of the present invention may further include an optical glass 8, and the optical glass 8 is disposed on both side walls of the first base and both side walls of the second base.
Illustratively, the optical glass 8 is a 3mm thick K3 optical glass, and the size of the window for mounting the optical glass 8 is 280mm × 80mm, which is formed by two side walls of the first base and two side walls of the second base.
From this, through setting up optical glass, can set up test device such as high-speed direct-photographing light path, schlieren shooting light path and observe the running state of preheating device that admits air, can look over the condition of flame in heating section pipeline 52 and the air current section pipeline 53 that flows out, conveniently adjust the fuel injection quantity and the heating time of sprayer 41 based on the condition of flame to improve preheating device 4's that admits air preheating device's preheating effect, reached and carried out optical diagnosis's purpose to preheating device 4 that admits air.
With continued reference to fig. 1, since the flame formed by the fuel injected from the fuel injector 41 ignited by the high-temperature ignition rod may extend a long distance along the flow direction of the air flow, the air flow outlet section pipe 53 needs to be arranged long, and accordingly, the optical glass 8 needs to be arranged long, while the long optical glass 8 has poor rigidity and is easily damaged, so that in order to avoid damage to the optical glass, the air flow outlet section pipe 53 is arranged to include a first air flow outlet section pipe 531, a second air flow outlet section pipe 532 and a third air flow outlet section pipe 533.
The air outlet of the heating section pipeline 52 is connected with the air inlet of the first airflow outflow section pipeline 531, the air outlet of the first airflow outflow section pipeline 531 is connected with the air inlet of the second airflow outflow section pipeline 532, the air outlet of the second airflow outflow section pipeline 532 is connected with the air inlet of the third airflow outflow section pipeline 533, and the air outlet of the third airflow outflow section pipeline 533 is communicated with the external environment.
Both side walls of the first air outflow section duct 531, both side walls of the second air outflow section duct 532, and both side walls of the third air outflow section duct 533 are provided with optical glasses 8.
From this, through setting up airflow outflow section pipeline 53 into the mode of multistage, reduced every section of optical glass 8's length, improved optical glass 8's rigidity, avoided optical glass 8 to damage in the use, simultaneously, can only change this section of optical glass 8 after optical glass 8 of certain section damages.
If more oxygen is consumed in the intake preheating stage, the oxygen content in the cylinder of the diesel engine is insufficient subsequently, so that diesel oil in the cylinder of the diesel engine cannot be combusted, and further the diesel engine cannot be started, therefore, the test device for simulating the intake preheating effect of the diesel engine in the air inlet passage environment provided by the embodiment of the invention can further comprise an oxygen sensor 9, and the oxygen sensor 9 is installed at the air outlet of the air flow outflow section pipeline 53.
From this, through the mode of installing oxygen sensor 9 at the gas outlet department of air current outflow section pipeline 53, can detect the oxygen content of the air current after preheating through inlet air preheating device 4 to confirm whether the oxygen content that detects can be used for the diesel engine to start, reach the purpose of monitoring the oxygen content of the air current after preheating.
And the second method comprises the following steps: electric heating type air inlet preheating device
The electrically heated intake air preheating device 4 may include an electrically heated rod installed to the fixing device installed to the bottom surface of the first base, and a fixing device for heating the gas introduced into the heating section duct 52.
Wherein, fixing device can be the same with first kind preheating device's that admits air fixing device, including upper fixed plate, bottom plate and support column 43, the one end of electrical heating rod is fixed in between upper fixed plate and the bottom plate, the one end fixed connection of support column 43 is in the bottom plate, other end fixed connection is in the bottom surface of first base, that is to say, the one end of electrical heating rod is cliied to upper fixed plate and bottom plate, and the other end exposes outside, and after the circular telegram, the electrical heating rod heats the gas that gets into in the heating section pipeline 52.
Therefore, after the diesel engine is electrified, the gas entering the heating section pipeline 52 is heated by the electric heating rod, intake preheating is achieved, oxygen is not consumed, and the situation that the diesel engine cannot be started after intake preheating is avoided.
The testing device provided by the embodiment of the invention can accurately simulate the flow velocity of the air flow entering the air inlet of the diesel engine, so that the air inlet environment of the diesel engine can be accurately simulated, the preheating effect of the air inlet preheating device at low ambient temperature and the consumption of the air inlet preheating device can be accurately measured, the consumption is the consumption of combustion fuel for the first air inlet preheating device, and the consumption is the consumption of electric quantity for the second air inlet preheating device.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
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