CN102913399A - Plasma flow control method for reducing the wake loss of a wind turbine - Google Patents
Plasma flow control method for reducing the wake loss of a wind turbine Download PDFInfo
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- CN102913399A CN102913399A CN201210438570XA CN201210438570A CN102913399A CN 102913399 A CN102913399 A CN 102913399A CN 201210438570X A CN201210438570X A CN 201210438570XA CN 201210438570 A CN201210438570 A CN 201210438570A CN 102913399 A CN102913399 A CN 102913399A
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Abstract
The invention provides a plasma flow control method for reducing the wake loss of a wind turbine. Two metal electrodes are distributed asymmetrically on the two sides of an insulating material, wherein one metal electrode is exposed in the air and the other metal electrode is embedded in the insulating material, thereby forming a set of plasma exciter; the plasma exciter is mounted at a tail edge of a suction surface of a blade on a wind turbine, and the mounting manner ensures that the plasma induction flow direction is the same as the main flow direction; and plasma excitation voltages are applied to the two metal electrodes of the plasma exciter, weakly ionized low-temperature plasma is generated above the metal electrode embedded into the insulating material, and the energy is conveyed to a boundary layer through collision between ions and neutral gas molecules, so that the ambient air forms a horizontal jet flow with the static flow of zero, and the air flow in a boundary layer is accelerated. The plasma flow control method can reduce the wake loss of the wind turbine and reduce the interference of the wake in the downstream wind turbine, thereby improving the total output power of a whole wind power farm.
Description
Technical field
The present invention relates to energy technology field, be used for the wind-power electricity generation industry, relate to particularly a kind of new method that reduces the wind energy conversion system Trailing Edge Loss, improves the wind energy conversion system generating efficiency, relate more specifically to a kind of method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss.
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.Such as, the cost of electricity-generating of a large wind power station of Denmark has reduced about 2/3rds during the nearly last ten years.The present invention proposes for reduction wind power cost, raising wind-powered electricity generation Economy just.Many wind energy conversion systems are arranged together in the wind energy turbine set, and some wind energy conversion systems will be in the tail of other wind energy conversion systems, and the performance of wind energy conversion system is affected, and power stage reduces, and affect the total power stage of whole wind energy turbine set.The present invention can improve the total output power of whole wind energy turbine set by improving the tail of wind energy conversion system.
Summary of the invention
The object of the invention is to propose a kind of method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss, adopt method of the present invention can reduce on the one hand the Trailing Edge Loss of wind energy conversion system, tail can be reduced on the other hand to the interference of downstream wind energy conversion system, and then the total output power of whole wind energy turbine set can be improved.
For achieving the above object, the method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss provided by the invention is:
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, this plasma actuator is installed in the trailing edge place of pneumatic equipment blades made suction surface, and mounting type must make plasma-induced flow direction identical with main flow direction; Apply plasma excitation voltage on two metal films of Plasma Actuator, generate above the metal film in embedding insulating material light current from low temperature plasma, 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.
The described method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss, wherein, Plasma Actuator is apart from blade trailing edge 1-1000mm.
The described method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss, wherein, plasma excitation voltage is that the frequency of 1-100kV, plasma excitation voltage is the Ac of 1-1000kHz.
The described method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss, wherein, the insulating material of described Plasma Actuator is teflon, pottery or silica glass.
The described method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss, wherein, the insulation thickness of described Plasma Actuator is 0.01-100mm.
The described method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss, wherein, the material of the metal film of described Plasma Actuator is tungsten, molybdenum, steel or copper.
The described method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss, wherein, the metal film of described Plasma Actuator is shaped as rectangular.
The described method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss, wherein, the metal film width of described Plasma Actuator is 0.1-100mm.
The present invention is reducing with known technology very large difference is arranged aspect the wind energy conversion system Trailing Edge Loss: 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 reduce the wind energy conversion system Trailing Edge Loss;
2) plasma excitation is electric excitation, does not have moving element;
3) simple in structure, low in energy consumption, excitation parameters is regulated easily;
4) the incentive action Bandwidth and, response rapidly.
Description of drawings
Fig. 1 is the structural representation of the Plasma Actuator that adopts of the present invention;
Fig. 2 is the structural representation of realizing the inventive method.
Fig. 3 is known pneumatic equipment blades made tail schematic representation;
Fig. 4 is that plasma excitation of the present invention reduces wind energy conversion system tail schematic representation.
Embodiment
The method for controlling plasma flow that reduces the wind energy conversion system Trailing Edge Loss provided by the invention is used for wind-power generating system, and the inventive method 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 (high-voltage ac power) is for Plasma Actuator provides power supply.
The present invention adopts the plasma exciting method that is applicable to the control of wind energy conversion system wake from the angle of fluid machinery aerothermodynamics and plasma physics, makes the wind energy conversion system Trailing Edge Loss be in reduced levels always.
The present invention arranges Plasma Actuator at place, pneumatic equipment blades made fixed position, applies the plasma excitation of suitable intensity and frequency, can play the effect that reduces the wind energy conversion system Trailing Edge Loss on the one hand, can reduce on the other hand tail to the interference of downstream 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, produced such as inducing among Fig. 1 mobile.
Fig. 2 is structural representation of the present invention, and Plasma Actuator 1 is arranged in the trailing edge of the suction surface 15 of pneumatic equipment blades made 14, and Plasma Actuator 1 (edge of buried electrodes 12) remains with the distance of 1-1000mm apart from the trailing edge of pneumatic equipment blades made.The bare electrode 11 of plasma actuator links to each other with the high voltage terminal of energizing voltage 13, the buried electrodes 12 of plasma actuator links to each other with the grounding end of energizing voltage 13, a direct-open energizing voltage 13 in the wind energy conversion system running, apply plasma excitation, so just can reduce the pneumatic equipment blades made Trailing Edge Loss, reduce simultaneously the interference to the downstream wind energy conversion system.
Fig. 3 has provided known pneumatic equipment blades made and has streamed schematic representation, and incoming flow has formed tail through behind the pneumatic equipment blades made as seen from the figure, is full of irregular whirlpool in the tail, constantly consumes the energy of air-flow, and forms pressure drag and aerodynamic noise.
Fig. 4 has provided the present invention and has utilized plasma excitation to reduce tail width indication figure, as seen from the figure under the plasma excitation effect, with do not apply plasma excitation among Fig. 3 and compare, tail width behind the pneumatic equipment blades made reduces, can reduce Trailing Edge Loss like this, reduce simultaneously the interference to the downstream 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 reduces the wind energy conversion system Trailing Edge Loss:
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, this plasma actuator is installed in the trailing edge place of pneumatic equipment blades made suction surface, and mounting type must make plasma-induced flow direction identical with main flow direction;
Apply plasma excitation voltage on two metal films of Plasma Actuator, generate above the metal film in embedding insulating material light current from low temperature plasma, 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. reduce as claimed in claim 1 the method for controlling plasma flow of wind energy conversion system Trailing Edge Loss, wherein, described Plasma Actuator is apart from pneumatic equipment blades made trailing edge 1-1000mm.
3. reduce as claimed in claim 1 the method for controlling plasma flow of wind energy conversion system Trailing Edge Loss, wherein, described plasma excitation voltage is that the frequency of 1-100kV, plasma excitation voltage is the Ac of 1-1000kHz.
4. reduce as claimed in claim 1 the method for controlling plasma flow of wind energy conversion system Trailing Edge Loss, 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. reduce as claimed in claim 1 the method for controlling plasma flow of wind energy conversion system Trailing Edge Loss, wherein, the material of the metal film of described Plasma Actuator is tungsten, molybdenum, steel or copper.
7. reduce as claimed in claim 1 the method for controlling plasma flow of wind energy conversion system Trailing Edge Loss, wherein, the metal film of described Plasma Actuator is shaped as rectangular.
8. reduce as claimed in claim 1 the method for controlling plasma flow of wind energy conversion system Trailing Edge Loss, wherein, the metal film width of described Plasma Actuator is 0.1-100mm.
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| CN201210438570XA CN102913399A (en) | 2012-11-06 | 2012-11-06 | Plasma flow control method for reducing the wake loss of a wind turbine |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105134496A (en) * | 2014-05-29 | 2015-12-09 | 株式会社东芝 | Wind power generation system and wind power generation method |
| JP2016070085A (en) * | 2014-09-26 | 2016-05-09 | 株式会社東芝 | Wind farm |
| JP2016098787A (en) * | 2014-11-26 | 2016-05-30 | 株式会社東芝 | Wind farm and wind power generation system |
| US9551322B2 (en) | 2014-04-29 | 2017-01-24 | General Electric Company | Systems and methods for optimizing operation of a wind farm |
| CN107061153A (en) * | 2017-04-13 | 2017-08-18 | 上海理工大学 | Vertical axis windmill based on plasma flow control |
| CN107631854A (en) * | 2017-10-30 | 2018-01-26 | 吉林大学 | A kind of model wind tunnel test floor plasma boundary layer active control device and its control method |
| US10024304B2 (en) | 2015-05-21 | 2018-07-17 | General Electric Company | System and methods for controlling noise propagation of wind turbines |
| CN109779948A (en) * | 2019-01-17 | 2019-05-21 | 沈阳航空航天大学 | It is a kind of for improving the plasma formula blade tip clearance encapsulating method of axial flow blower performance |
| US10385829B2 (en) | 2016-05-11 | 2019-08-20 | General Electric Company | System and method for validating optimization of a wind farm |
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| CN101666343A (en) * | 2008-09-03 | 2010-03-10 | 中国科学院工程热物理研究所 | Control system and control method for plasma excitation for cascade internal flow |
| CN102595758A (en) * | 2011-01-12 | 2012-07-18 | 中国科学院工程热物理研究所 | Dielectric barrier discharge (DBD) plasma trailing edge jetting device and method |
| JP2012189215A (en) * | 2006-04-28 | 2012-10-04 | Toshiba Corp | Wing, airflow generation device, heat exchanger, micro machine, and gas treatment device |
| JP2012193678A (en) * | 2011-03-17 | 2012-10-11 | Toshiba Corp | Airflow generation device, and insulating film for the same |
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Patent Citations (4)
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| JP2012189215A (en) * | 2006-04-28 | 2012-10-04 | Toshiba Corp | Wing, airflow generation device, heat exchanger, micro machine, and gas treatment device |
| CN101666343A (en) * | 2008-09-03 | 2010-03-10 | 中国科学院工程热物理研究所 | Control system and control method for plasma excitation for cascade internal flow |
| CN102595758A (en) * | 2011-01-12 | 2012-07-18 | 中国科学院工程热物理研究所 | Dielectric barrier discharge (DBD) plasma trailing edge jetting device and method |
| JP2012193678A (en) * | 2011-03-17 | 2012-10-11 | Toshiba Corp | Airflow generation device, and insulating film for the same |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US9551322B2 (en) | 2014-04-29 | 2017-01-24 | General Electric Company | Systems and methods for optimizing operation of a wind farm |
| 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 |
| JP2016070085A (en) * | 2014-09-26 | 2016-05-09 | 株式会社東芝 | Wind farm |
| JP2016098787A (en) * | 2014-11-26 | 2016-05-30 | 株式会社東芝 | Wind farm and wind power generation system |
| US10024304B2 (en) | 2015-05-21 | 2018-07-17 | General Electric Company | System and methods for controlling noise propagation of wind turbines |
| US10385829B2 (en) | 2016-05-11 | 2019-08-20 | General Electric Company | System and method for validating optimization of a wind farm |
| CN107061153A (en) * | 2017-04-13 | 2017-08-18 | 上海理工大学 | Vertical axis windmill based on plasma flow control |
| CN107631854A (en) * | 2017-10-30 | 2018-01-26 | 吉林大学 | A kind of model wind tunnel test floor plasma boundary layer active control device and its control method |
| CN107631854B (en) * | 2017-10-30 | 2023-06-06 | 吉林大学 | Active control device and control method for plasma boundary layer of model wind tunnel test floor |
| CN109779948A (en) * | 2019-01-17 | 2019-05-21 | 沈阳航空航天大学 | It is a kind of for improving the plasma formula blade tip clearance encapsulating method of axial flow blower performance |
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Application publication date: 20130206 |