CN102913386A - Plasma flow control method for suppressing flow separation of suction surface of wind turbine blade - Google Patents
Plasma flow control method for suppressing flow separation of suction surface of wind turbine blade Download PDFInfo
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- CN102913386A CN102913386A CN2012104386948A CN201210438694A CN102913386A CN 102913386 A CN102913386 A CN 102913386A CN 2012104386948 A CN2012104386948 A CN 2012104386948A CN 201210438694 A CN201210438694 A CN 201210438694A CN 102913386 A CN102913386 A CN 102913386A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
一种抑制风力机叶片吸力面流动分离的等离子体流动控制方法：在绝缘材料两侧非对称地布置两块金属电极，其中一块金属电极裸露在空气中，另一块金属电极嵌在绝缘材料里，组成一组等离子体激励器，在风力机叶片的吸力面上安装至少一组等离子体激励器，安装方式须使等离子体诱导流动方向与主流方向相同；在等离子体激励器的两个金属电极上施加等离子体激励电压，在嵌入绝缘材料内的金属电极上方生成低温等离子体，通过离子与中性气体分子的碰撞向边界层输送能量，使周围空气形成静流量为零的水平方向射流，加速附面层内的气流流动。本发明具有机构简单紧凑、反应迅速、能耗低等优点。
A plasma flow control method for suppressing flow separation on the suction surface of a wind turbine blade: two metal electrodes are asymmetrically arranged on both sides of the insulating material, one of which is exposed in the air, and the other is embedded in the insulating material. Form a group of plasma exciters, install at least one set of plasma exciters on the suction surface of the wind turbine blades, and install them in such a way that the plasma-induced flow direction is the same as the main flow direction; on the two metal electrodes of the plasma exciter The plasma excitation voltage is applied to generate low-temperature plasma above the metal electrode embedded in the insulating material, and the energy is transmitted to the boundary layer through the collision of ions and neutral gas molecules, so that the surrounding air forms a horizontal jet with a static flow of zero, and accelerates the surrounding air. Air flow within the facing. The invention has the advantages of simple and compact structure, rapid response, low energy consumption and the like.
Description
Technical field
The present invention relates to energy technology field, be used for the wind-power electricity generation industry, a kind of inhibition pneumatic equipment blades made suction surface flow separation specifically improves the method for wind energy conversion system generating efficiency, more specifically relates to a kind of method for controlling plasma flow that suppresses pneumatic equipment blades made suction surface flow separation.
Technical background
The energy is the important material base of national economy, also is the primary condition that the mankind depend on for existence, and the speed of the national economic development and the raising of living standards of the people all depend on provides for what of the energy.The progressively exhaustion of tradition fossil energy, and to the pollution of environment, energy crisis is obviously approached.China has become world energy sources production and consumption big country, and along with development economic and society, China's energy demand is with sustainable growth, and the shortage of the energy has become a key issue of restriction economic development.Develop the only way that reproducible green energy resource is social sustainable development.Therefore, the development and utilization of renewable new energy more and more causes people's concern.Renewable energy sources comprises water energy, biomass energy, wind energy, solar energy, geothermal power and ocean energy etc.These resource potentials are large, and environmental pollution is low, and sustainable use is the important energy source that is conducive to the harmony between man and nature development.Since the seventies in last century, the idea of sustainable development progressively becomes international community's common recognition, the renewable energy sources development and use are subject to countries in the world and pay much attention to, many countries will develop renewable energy sources as the important component part of energy strategy, clear and definite Renewable Energy Development target has been proposed, formulated law and the policy of encouraging Renewable Energy Development, renewable energy sources is developed rapidly.In recent years, in the green energy resource of developmental research, wind energy has become the most rapidly one of energy of in the world development, estimates that its annual growth will reach 20% in 10 years from now on.Wind energy is called as " following the energy ", and it is different from traditional energy such as coal, oil and atomic power, neither can be to environment, and also can exhaustion.In the developing country that living standard rises gradually, wind energy is a kind of simple installation and the effective energy, and usually is can be to the sole mode of remote districts power supply.In industrialized country, wind energy a kind of novel energy of taking into account energy increase-volume and environmental requirement of can yet be regarded as.
Different in rise from the cost of most of energy, along with the progress of technology, the cost of wind energy but descends, and the Economy of wind energy is improving constantly.Reduced during the nearly last ten years approximately 2/3rds such as, the cost of electricity-generating of a large wind power station of Denmark.
Wind energy conversion system is in running, wind speed and direction in the environment is often to change, so wind energy conversion system is through the off-design point operation of being everlasting, and then the situation of blade suction surface flow separation can occur, cause the increase of pneumatic equipment blades made resistance, lift to reduce, reduce the output power of wind energy conversion system.The present invention can reduce the resistance of pneumatic equipment blades made, the lift of increase blade by suppressing the flow separation of pneumatic equipment blades made suction surface, improves the output power of wind energy conversion system.
Summary of the invention
The object of the present invention is to provide a kind of method for controlling plasma flow that suppresses pneumatic equipment blades made suction surface flow separation, to reduce wind power cost, to improve the wind-powered electricity generation Economy.
For achieving the above object, the method for controlling plasma flow of inhibition pneumatic equipment blades made suction surface flow separation provided by the invention, asymmetricly to arrange two blocks of metal films in the insulating material both sides, wherein a metal film exposes in air, another piece metal film is embedded in the insulating material, form one group of Plasma Actuator, at the suction surface of pneumatic equipment blades made at least one group of Plasma Actuator is installed, mounting type must make plasma-induced flow direction identical with main flow direction;
Two metal films at Plasma Actuator apply plasma excitation voltage, generate low temperature plasma above the metal film in embedding insulating material, collision by ion and neutral gas molecule is to the boundary layer conveying capacity, making surrounding atmosphere form the stationary stream amount is zero substantially horizontal jet, accelerates the air current flow in the boundary layer.
In the method for controlling plasma flow of described inhibition pneumatic equipment blades made suction surface flow separation, Plasma Actuator is two groups when above, and the spacing between every group of actuator is 1-1000mm.
In the method for controlling plasma flow of described inhibition pneumatic equipment blades made suction surface flow separation, plasma excitation voltage is that 1-100kV, frequency are the Ac of 1-1000kHz.
In the method for controlling plasma flow of described inhibition pneumatic equipment blades made suction surface flow separation, the insulating material of Plasma Actuator is teflon, pottery or silica glass.
In the method for controlling plasma flow of described inhibition pneumatic equipment blades made suction surface flow separation, the insulation thickness of Plasma Actuator is 0.01-100mm.
In the method for controlling plasma flow of described inhibition pneumatic equipment blades made suction surface flow separation, the material of the metal film of Plasma Actuator is tungsten, molybdenum, steel or copper.
In the method for controlling plasma flow of described inhibition pneumatic equipment blades made suction surface flow separation, the metal film of Plasma Actuator is shaped as rectangular.
In the method for controlling plasma flow of described inhibition pneumatic equipment blades made suction surface flow separation, the metal film width of Plasma Actuator is 0.1-100mm.
The present invention is suppressing with the technology of moving now very large difference is arranged aspect the pneumatic equipment blades made suction surface flow separation: plasma flow control is a kind of flow control technique based on plasma aerodynamic actuation, plasma excitation is take plasma as carrier, and stream field applies a kind of controlled disturbance.Innovative point of the present invention is embodied in:
1) method for controlling plasma flow is applied to suppress pneumatic equipment blades made suction surface flow separation;
2) plasma excitation is electric excitation, does not have moving element;
3) simple in structure, low in energy consumption, excitation parameters is easily regulated;
4) the incentive action Bandwidth and, response rapidly;
5) Plasma Actuator can not affect blade profile, does not have negative effect when not using.
Description of drawings
Fig. 1 is the structural representation of the Plasma Actuator that adopts of the present invention;
Fig. 2 is the system and device schematic diagram of realizing method of the present invention.
Fig. 3 is known pneumatic equipment blades made suction surface flow separation schematic diagram;
Fig. 4 is that plasma excitation suppresses pneumatic equipment blades made suction surface flow separation schematic diagram;
Embodiment
The method for controlling plasma flow of inhibition pneumatic equipment blades made suction surface flow separation of the present invention can suppress pneumatic equipment blades made suction surface flow separation, improves the output power of wind energy conversion system.
The method for controlling plasma flow of inhibition pneumatic equipment blades made suction surface flow separation provided by the invention comprises following a few part:
Pneumatic equipment blades made plays the effect that drives the generator generating, also is the carrier of Plasma Actuator simultaneously;
Plasma Actuator produces plasma behind the connection high-tension electricity, near air accelerating;
Plasma excitation voltage is to provide power supply by high-voltage ac power for Plasma Actuator;
The present invention adopts the plasma exciting method that is applicable to pneumatic equipment blades made suction surface flow separation from the angle of fluid machinery aerothermodynamics and plasma physics, suppresses pneumatic equipment blades made suction surface flow separation.
The method for controlling plasma flow of inhibition pneumatic equipment blades made suction surface flow separation of the present invention, be applicable to wind turbine system, at pneumatic equipment blades made fixed position arrangement Plasma Actuator, apply the plasma excitation of suitable intensity and frequency,, can play the effect that suppresses pneumatic equipment blades made suction surface flow separation, and then improve the output power of wind energy conversion system.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the structural representation of Plasma Actuator 1 of the present invention, the asymmetric two blocks of metal films 11,12 of arranging in insulating material 10 both sides (interlocking), in the metal film 11 exposed air around (hereinafter referred to as bare electrode 11), another piece metal film 12 is embedded in 10 li of insulating material (hereinafter referred to as buried electrodes 12) and forms one group of Plasma Actuator 1, and metal film 11,12 width can be 0.1-100mm.In fact can have manyly to bare electrode 11 and buried electrodes 12 in one group of Plasma Actuator, and be interlaced arrangement, the staggered spacing between 12 two metal films of bare electrode 11 and buried electrodes can be 0-5mm.The present invention can adopt but the rectangular metal film that is not limited to make such as copper product, and insulating material can adopt but be not limited to such as teflon or silica glass etc., and insulation thickness is 0.01-100mm.At energizing voltage 13 (voltage 1-100kV, the High Level AC Voltage of frequency 1-1000kHz) under the effect, can above buried electrodes 12, generate light current from low temperature plasma 20, collision by ion and neutral gas molecule is to the boundary layer conveying capacity, making surrounding atmosphere form the stationary stream amount is zero substantially horizontal jet, accelerate the air current flow in the boundary layer, play the mobile effect of inducing, as shown in Figure 1.
Fig. 2 is the device schematic diagram of realizing the inventive method, and many group (shown in the figure be three groups, but be not limited to three groups) Plasma Actuators 1 are arranged on the suction surface 15 of pneumatic equipment blades made 14, and the spacing between every group of Plasma Actuator is 1-1000mm.The bare electrode 11 of Plasma Actuator 1 links to each other with the high voltage terminal of energizing voltage 13, and the buried electrodes 12 of Plasma Actuator 1 links to each other with the grounding end of energizing voltage 13.
A direct-open energizing voltage 13 applies plasma excitation in the wind energy conversion system running, can suppress pneumatic equipment blades made suction surface 15 flow separation, reduces the blade resistance, increases blade lift, improves the output power of wind energy conversion system.
Fig. 3 has provided known pneumatic equipment blades made suction surface flow separation schematic diagram, as seen from the figure, flow separation has occured and has formed separation zone A in blade suction surface 15 when the large incoming flow angle of attack, the existence of separation zone A increased blade resistance, reduced the lift of blade, and wind energy conversion system to be lift by blade drive the engine revolution generating, so pneumatic equipment blades made suction surface flow separation can reduce the output power of wind energy conversion system.
Fig. 4 has provided plasma excitation and has suppressed pneumatic equipment blades made suction surface flow separation schematic diagram, as seen from the figure under the plasma excitation effect, air-flow is attached on the pneumatic equipment blades made, blade suction surface 15 flow separation are inhibited, can reduce like this blade resistance, increase blade lift, and then improve the output power of wind energy conversion system.
Above-described specific embodiment; purpose of the present invention, technological scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. method for controlling plasma flow that suppresses pneumatic equipment blades made suction surface flow separation:
Asymmetricly arrange two blocks of metal films in the insulating material both sides, wherein a metal film exposes in air, another piece metal film is embedded in the insulating material, form one group of Plasma Actuator, suction surface at pneumatic equipment blades made is installed at least one group of Plasma Actuator, and mounting type must make plasma-induced flow direction identical with main flow direction;
Two metal films at Plasma Actuator apply plasma excitation voltage, generate low temperature plasma above the metal film in embedding insulating material, collision by ion and neutral gas molecule is to the boundary layer conveying capacity, making surrounding atmosphere form the stationary stream amount is zero substantially horizontal jet, accelerates the air current flow in the boundary layer.
2. the method for controlling plasma flow that suppresses as claimed in claim 1 pneumatic equipment blades made suction surface flow separation, wherein, described Plasma Actuator is two groups when above, the spacing between every group of actuator is 1-1000mm.
3. the method for controlling plasma flow that suppresses as claimed in claim 1 pneumatic equipment blades made suction surface flow separation, wherein, described plasma excitation voltage is that the frequency of 1-100kV, plasma excitation voltage is the Ac of 1-1000kHz.
4. the method for controlling plasma flow that suppresses as claimed in claim 1 pneumatic equipment blades made suction surface flow separation, wherein, the insulating material of described Plasma Actuator is teflon, pottery or silica glass.
5. the method for controlling plasma flow that suppresses as claimed in claim 1 pneumatic equipment blades made suction surface flow separation, wherein, the insulation thickness of described Plasma Actuator is 0.01-100mm.
6. the method for controlling plasma flow that suppresses as claimed in claim 1 pneumatic equipment blades made suction surface flow separation, wherein, the material of the metal film of described Plasma Actuator is tungsten, molybdenum, steel or copper.
7. the method for controlling plasma flow that suppresses as claimed in claim 1 pneumatic equipment blades made suction surface flow separation, wherein, the metal film of described Plasma Actuator is shaped as rectangular.
8. the method for controlling plasma flow that suppresses as claimed in claim 1 pneumatic equipment blades made suction surface flow separation, wherein, the metal film width of described Plasma Actuator is 0.1-100mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012104386948A CN102913386A (en) | 2012-11-06 | 2012-11-06 | Plasma flow control method for suppressing flow separation of suction surface of wind turbine blade |
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| CN2012104386948A CN102913386A (en) | 2012-11-06 | 2012-11-06 | Plasma flow control method for suppressing flow separation of suction surface of wind turbine blade |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103287575A (en) * | 2013-06-07 | 2013-09-11 | 上海交通大学 | Method for reducing surface resistance based on plasma exciting device |
| CN103410680A (en) * | 2013-06-19 | 2013-11-27 | 中国科学院电工研究所 | Plasma control device and method for blades of wind driven generator |
| CN105134496A (en) * | 2014-05-29 | 2015-12-09 | 株式会社东芝 | Wind power generation system and wind power generation method |
| CN107416181A (en) * | 2017-07-28 | 2017-12-01 | 中国人民解放军装备学院 | A kind of near space unmanned plane enhancing device |
| CN108116661A (en) * | 2017-11-24 | 2018-06-05 | 南京航空航天大学 | A kind of active flow control devices and control method for rotor |
| CN111043085A (en) * | 2019-12-05 | 2020-04-21 | 中国人民解放军空军工程大学 | Device and method for regulating and controlling blade surface boundary layer of supersonic compressor by using NS-DBD |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103287575A (en) * | 2013-06-07 | 2013-09-11 | 上海交通大学 | Method for reducing surface resistance based on plasma exciting device |
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| CN103410680B (en) * | 2013-06-19 | 2016-01-20 | 中国科学院电工研究所 | For plasma control apparatus and the method for blade of wind-driven generator |
| CN105134496A (en) * | 2014-05-29 | 2015-12-09 | 株式会社东芝 | Wind power generation system and wind power generation method |
| CN105134496B (en) * | 2014-05-29 | 2018-10-19 | 株式会社东芝 | Wind generator system and wind power generation method |
| CN107416181A (en) * | 2017-07-28 | 2017-12-01 | 中国人民解放军装备学院 | A kind of near space unmanned plane enhancing device |
| CN108116661A (en) * | 2017-11-24 | 2018-06-05 | 南京航空航天大学 | A kind of active flow control devices and control method for rotor |
| CN111043085A (en) * | 2019-12-05 | 2020-04-21 | 中国人民解放军空军工程大学 | Device and method for regulating and controlling blade surface boundary layer of supersonic compressor by using NS-DBD |
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Application publication date: 20130206 |