CN109779948B - A plasma tip clearance sealing method for improving the performance of an axial flow fan - Google Patents
A plasma tip clearance sealing method for improving the performance of an axial flow fan Download PDFInfo
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- CN109779948B CN109779948B CN201910042809.3A CN201910042809A CN109779948B CN 109779948 B CN109779948 B CN 109779948B CN 201910042809 A CN201910042809 A CN 201910042809A CN 109779948 B CN109779948 B CN 109779948B
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- 239000002245 particle Substances 0.000 claims abstract description 4
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Abstract
一种用于提高轴流风机性能的等离子式叶顶间隙密封方法，步骤为：将轴流风机的叶片和机匣更换为绝缘材料；在机匣外部设置等离子发生器，在叶片顶部安装负极，负极依次通过导线、叶轮轴引电器与等离子发生器负极接线端子相连；在与叶片顶部正对的机匣内壁上安装圆环形正极，正极通过导线与等离子发生器正极接线端子相连；启动轴流风机，启动等离子发生器，在正极与负极之间形成电场，使正极与负极之间的空气产生电离，随着叶片的高速旋转，将在叶片顶部与机匣之间的环形间隙内形成等离子体环幕，当叶片压力面的气流想要从间隙通过时，气流中的中性粒子将与等离子体环幕发生碰撞，进而对这部分气流产生阻挡效应，用以降低从间隙泄露出的气流量。
A plasma-type blade tip gap sealing method for improving the performance of an axial-flow fan. The negative electrode is connected to the negative terminal of the plasma generator through the wire and the impeller shaft lead in turn; the annular positive electrode is installed on the inner wall of the casing facing the top of the blade, and the positive electrode is connected to the positive terminal of the plasma generator through the wire; start the axial flow Fan, start the plasma generator, form an electric field between the positive electrode and the negative electrode, ionize the air between the positive electrode and the negative electrode, and with the high-speed rotation of the blade, a plasma will be formed in the annular gap between the top of the blade and the casing Ring curtain, when the airflow on the pressure surface of the blade wants to pass through the gap, the neutral particles in the airflow will collide with the plasma ring curtain, and then produce a blocking effect on this part of the airflow to reduce the amount of airflow leaking from the gap. .
Description
Technical Field
The invention belongs to the technical field of axial flow fans, and particularly relates to a plasma type blade top gap sealing method for improving the performance of an axial flow fan.
Background
The working principle of the axial flow fan is that when the impeller rotates, gas can pass through the impeller from the air inlet along the axial direction, blades on the impeller push the gas to increase the pressure, the gas after pressure increase flows through the impeller and then enters the guide vane, the guide vane can convert deflected gas flow into axial gas flow, meanwhile, the gas flow flows into the diffuser pipe, and kinetic energy of the gas can be further converted into pressure energy in the diffuser pipe.
However, the working efficiency of the axial flow fan is generally low at present, and in order to prevent the rotating blade and the stationary casing from being abraded, a certain gap needs to be left between the blade tip and the casing in the working process of the axial flow fan, and because the pressure of the pressure surface of the blade is greater than that of the suction surface, the leakage of the blade tip gap inevitably occurs, and the leakage of the blade tip gap directly affects the flow of the main stream, affects the lift coefficient of the blade, and finally affects the performance of the axial flow fan.
At the present stage, research for solving the problem of blade tip clearance leakage of the axial flow fan is still in a blank stage, in order to improve the performance of the axial flow fan, research for blade tip clearance leakage of the axial flow fan needs to be carried out, and an effective blade tip clearance sealing method is provided.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a plasma type blade top gap sealing method for improving the performance of an axial flow fan, which effectively fills the gap of blade top gap leakage research of the axial flow fan and can further improve the working efficiency of the axial flow fan.
In order to achieve the purpose, the invention adopts the following technical scheme: a plasma type blade top gap sealing method for improving the performance of an axial flow fan comprises the following steps:
the method comprises the following steps: the blades and the casing of the axial flow fan are all replaced by insulating materials;
step two: a plasma generator is arranged outside the casing, a negative electrode is arranged at the top of the blade and is connected with a negative electrode wiring terminal of the plasma generator sequentially through a lead and an impeller shaft electrical starter; the positive electrode is arranged on the inner wall of the casing, which is opposite to the top of the blade, and is in a circular ring shape and is connected with a positive electrode wiring terminal of the plasma generator through a lead;
step three: starting the axial flow fan to enable the blades to rotate at a high speed;
step four: and starting the plasma generator to form an electric field between the positive electrode and the negative electrode, so that air between the positive electrode and the negative electrode is ionized, a plasma circular curtain is formed in an annular gap between the top of the blade and the casing along with the high-speed rotation of the blade, when the airflow on the pressure surface of the blade wants to pass through the gap, neutral particles in the airflow collide with the plasma circular curtain, and a blocking effect is further generated on the airflow so as to reduce the flow of the airflow leaked from the gap.
The invention has the beneficial effects that:
the plasma type blade top gap sealing method for improving the performance of the axial flow fan effectively fills the gap of the blade top gap leakage research of the axial flow fan, and can further improve the working efficiency of the axial flow fan.
Drawings
FIG. 1 is a schematic diagram illustrating the effect of the plasma tip clearance sealing method for improving the performance of an axial flow fan according to the present invention;
in the figure, 1 is a blade, 2 is a casing, 3 is a cathode, 4 is an anode, and 5 is a plasma circular curtain.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
A plasma type blade top gap sealing method for improving the performance of an axial flow fan comprises the following steps:
the method comprises the following steps: the blade 1 and the casing 2 of the axial flow fan are all replaced by insulating materials;
step two: a plasma generator is arranged outside the casing 2, a negative electrode 3 is arranged at the top of the blade 1, and the negative electrode 3 is connected with a negative electrode connecting terminal of the plasma generator sequentially through a lead and an impeller shaft electrical starter; an anode 4 is arranged on the inner wall of the casing 2 opposite to the top of the blade 1, the anode 4 is in a ring shape, and the anode 4 is connected with an anode connecting terminal of the plasma generator through a lead;
step three: starting the axial flow fan to enable the blades 1 to rotate at a high speed;
step four: the plasma generator is started, an electric field is formed between the anode 4 and the cathode 3, so that air between the anode 4 and the cathode 3 is ionized, a plasma circular curtain 5 is formed in an annular gap between the top of the blade 1 and the casing 2 along with the high-speed rotation of the blade 1, when airflow on the pressure surface of the blade 1 wants to pass through the gap, neutral particles in the airflow collide with the plasma circular curtain 5, and a blocking effect is further generated on the airflow, so that the airflow leaked from the gap is reduced.
In this embodiment, the axial flow fan is modified as shown in fig. 1, wherein the positive electrode 4 and the negative electrode 3 both adopt sheet-like electrodes, the thickness of the electrodes is 0.2mm, the rated rotation speed of the axial flow fan is 2900r/min, the rated power of the axial flow fan is 0.55kW, the total pressure is 350Pa, and the annular gap between the top of the blade 1 and the casing 2 is 3 mm.
In order to verify that the working efficiency of the axial flow fan can be effectively improved by the method, a flowmeter is arranged on the outlet side of the axial flow fan, and a comparison test is carried out. Firstly, running an axial flow fan under the condition of not starting a plasma generator for 1 hour, and then recording the total flow for 1 hour through a flowmeter; next, the axial flow fan was operated with the plasma generator started, the operation time was also 1 hour, and then the total flow rate was recorded for 1 hour by the flow meter; the test is repeated for 10 times under both conditions, and the final result shows that under the condition of forming the plasma circular screen 5, the total flow of the axial flow fan for 1 hour is improved by about 5 percent on average compared with the condition of not starting the plasma generator, thereby proving the effectiveness of the invention.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (1)
1. A plasma type blade top gap sealing method for improving the performance of an axial flow fan is characterized by comprising the following steps:
the method comprises the following steps: the blades and the casing of the axial flow fan are all replaced by insulating materials;
step two: a plasma generator is arranged outside the casing, a negative electrode is arranged at the top of the blade and is connected with a negative electrode wiring terminal of the plasma generator sequentially through a lead and an impeller shaft electrical starter; the positive electrode is arranged on the inner wall of the casing, which is opposite to the top of the blade, and is in a circular ring shape and is connected with a positive electrode wiring terminal of the plasma generator through a lead;
step three: starting the axial flow fan to enable the blades to rotate at a high speed;
step four: and starting the plasma generator to form an electric field between the positive electrode and the negative electrode, so that air between the positive electrode and the negative electrode is ionized, a plasma circular curtain is formed in an annular gap between the top of the blade and the casing along with the high-speed rotation of the blade, when the airflow on the pressure surface of the blade wants to pass through the gap, neutral particles in the airflow collide with the plasma circular curtain, and a blocking effect is further generated on the airflow so as to reduce the flow of the airflow leaked from the gap.
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| CN201910042809.3A CN109779948B (en) | 2019-01-17 | 2019-01-17 | A plasma tip clearance sealing method for improving the performance of an axial flow fan |
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| CN201910042809.3A CN109779948B (en) | 2019-01-17 | 2019-01-17 | A plasma tip clearance sealing method for improving the performance of an axial flow fan |
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| CN109779948B true CN109779948B (en) | 2021-01-05 |
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| CN117948290B (en) * | 2024-03-22 | 2024-06-18 | 河北冀力重型机械设备有限公司 | Axial flow fan |
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| KR100464902B1 (en) * | 2001-02-12 | 2005-01-05 | (주)에스이 플라즈마 | Apparatus for generating low temperature plasama at atmospheric pressure |
| GB0411178D0 (en) * | 2004-05-20 | 2004-06-23 | Rolls Royce Plc | Sealing arrangement |
| CN1793665A (en) * | 2006-01-12 | 2006-06-28 | 上海交通大学 | Low noise axial fan with rotary deflecting ring |
| US7819626B2 (en) * | 2006-10-13 | 2010-10-26 | General Electric Company | Plasma blade tip clearance control |
| WO2008154592A2 (en) * | 2007-06-11 | 2008-12-18 | University Of Florida Research Foundation, Inc. | Electrodynamic control of blade clearance leakage loss in turbomachinery applications |
| US8282336B2 (en) * | 2007-12-28 | 2012-10-09 | General Electric Company | Instability mitigation system |
| CN103133391A (en) * | 2011-12-01 | 2013-06-05 | 中国科学院工程热物理研究所 | Cartridge receiver processing system |
| CN102913399A (en) * | 2012-11-06 | 2013-02-06 | 中国科学院工程热物理研究所 | Plasma flow control method for reducing the wake loss of a wind turbine |
| CN103835888B (en) * | 2012-11-20 | 2016-05-11 | 中国科学院工程热物理研究所 | The Apparatus and system of wind energy conversion system brake |
| CN104138712B (en) * | 2013-05-06 | 2016-02-24 | 孙红梅 | Wind wheel electrode discharge device |
| CN103925152A (en) * | 2014-04-23 | 2014-07-16 | 哈尔滨工业大学 | Wind turbine blade based on dielectric barrier discharging plasma excitation |
| JP2017053261A (en) * | 2015-09-08 | 2017-03-16 | 国立研究開発法人産業技術総合研究所 | Pressure loss reduction device for fluid machinery |
| CN105673559B (en) * | 2016-04-13 | 2018-04-06 | 上海理工大学 | Efficient meridionally-accelerated axial flow fan with casing |
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Effective date of registration: 20210514 Address after: 330200 no.2377 hanghanghangcheng Avenue, high tech Zone, Nanchang City, Jiangxi Province Patentee after: Jiangxi Zhongfa Tianxin Aero Engine Technology Co.,Ltd. Address before: 110136, Liaoning, Shenyang moral and Economic Development Zone, No. 37 South Avenue moral Patentee before: SHENYANG AEROSPACE University |
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Denomination of invention: A Plasma Blade Tip Gap Sealing Method for Improving the Performance of Axial Flow Fans Granted publication date: 20210105 Pledgee: CITIC Bank Nanchang branch of Limited by Share Ltd. Pledgor: Jiangxi Zhongfa Tianxin Aero Engine Technology Co.,Ltd. Registration number: Y2024980008468 |