CN201771673U - Vortex generator on surface of wind-power blade - Google Patents
Vortex generator on surface of wind-power blade Download PDFInfo
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- CN201771673U CN201771673U CN2009202867684U CN200920286768U CN201771673U CN 201771673 U CN201771673 U CN 201771673U CN 2009202867684 U CN2009202867684 U CN 2009202867684U CN 200920286768 U CN200920286768 U CN 200920286768U CN 201771673 U CN201771673 U CN 201771673U
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/0608—Rotors characterised by their aerodynamic shape
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05B2240/306—Surface measures
- F05B2240/3062—Vortex generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
A vortex generator on the surface of a wind-power blade is characterized in that a plurality of connected vortex generator units are installed at an area with largest profile thickness on the surface of the wind-power blade so as to generate blade-type suction side turbulent flow for increasing blade lifting force. The vortex generator is made of punched metal plates and has a stereoscopic triangular cone structure locally opposite in reverse directions, the folded edge of the cone root and a punched opening form 20-degreee deflection angles. Installation of the vortex generators in single band form can increase lift drag ratio of the blades, and leads the blades to start in lower starting wind speed, and achieve rated power via lower rated wind speed. At high wind speed, output power curves are more stable, and under the same wind condition, generation is increased by 3% to 5%. Additionally, the vortex generator has the effects of controlling vibration of the blades in a non-designed state and prolonging service life of the blades.
Description
Technical field
The utility model relates to the vortex generator on a kind of wind electricity blade surface, particularly about a kind of megawatt wind-power blade upper surface that is installed in, produces blade profile suction side turbulent flow to promote the vortex generator of blade lift.
Background technique
The Application and Development of the renewable sources of energy becomes one and shows, and on the option that reduces CO2 emission, it is important consideration and achievement that the whole world all is provided with the generating proportioning with the raising renewable sources of energy, wherein especially has more advantage with wind-power electricity generation on generated energy and economic benefit; Large-scale MW level wind electricity blade, as utilizing the nature wind energy to convert the instrument of mechanical energy generating to,, assist traditional firepower or nuclear energy power generation kenel in conjunction with the renewable clear energy sources that generator set produced, the consumption of minimizing fossil energy reaches the harm to environment, reaches the purpose of carbon reduction; Wind electricity blade is the technical products of most critical in the green energy industry wind-power generating system; Blade is base material in conjunction with pneumatic and structure engineering with polymer composites such as glass fiber cloth, epoxy resin, and surface Machining is handled and coating process, in conjunction with mechanical, material and chemical industry, is one to contain the engineering industry of complicated technology and knowledge.
The main function of blade produces lift exactly, the drives impeller rotation, and the shape of blade transverse section (horizontal section) is called blade profile, and the aggregating characteristic of blade section and the aerodynamic force of blade have confidential relation.See from the side, blade SS face (suction side) bending, and PS is more flat relatively, and the air-flow that blade will pass in air is separated, and portion of air is from blade SS surface current mistake, and another part is from PS surface current mistake.Because blade generally is asymmetric, the SS face is more protruding, and the PS face is more flat, and the air-flow velocity that flows through blade upper surface (SS face) is very fast, and it is slower to flow through the air-flow velocity of blade lower surface (PS face).According to hydromechanical basic principle, then atmospheric pressure is bigger slowly for air-flow velocity, and the fast atmospheric pressure of air-flow velocity is less, the pressure of blade PS face is just than the pressure height of SS face like this, in other words, be exactly that atmosphere applies pressure ratio with blade PS face to put on the pressure of blade SS face big, the pressure difference of the two has just formed the lift of blade; In simple terms, airspeed is fast more, and the aerodynamic lift that blade produces is also just big more, and when lift during greater than resistance, impeller just can rotate; When lift during less than resistance, impeller will stop.
It is because exist pressure difference on the upper and lower blade profile acting surface of blade that blade can produce lift, but this has precondition, will guarantee that exactly the air-flow on blade face does not separate.But when blade moved in air with certain tilt angle (being called the angle of attack), the pressure that upper and lower surface will occur was inconsistent, thereby also can produce lift.
When blade and airflow direction have angle (angle of attack), increasing lift with the angle of attack can increase, resistance also can increase, if the angle of attack of blade has arrived greatly to a certain degree, the flat board that blade is equivalent to hold up in air-flow, because angle is too big, speed is too fast, and the air-flow streamline of walking around the SS face can't link up, and can separate, be subjected to the drive of outer gas flow simultaneously, flow to trailing edge, will be rolled into the eddy current of a sealing at last, be called and separate the whirlpool, pressure is constant in Xuan Zhuan the separation whirlpool like this, and its pressure equals the pressure of the air-flow of SS face; So this moment, the pressure difference value on blade face can be little a lot of up and down, the lift of blade had just reduced than originally like this, and the whole generating system effectiveness greatly reduces.
The angle of attack is that 8 to 15 degree are better in general, and surpassing 15 degree rear blade SS face air-flows can separate, and produces eddy current, and lift can descend rapidly, and resistance can sharply rise, and this phenomenon is called stall; Blade stall has the influence that whole blade causes:
1. blade both sides difference pressuring loss has increased the blade running resistance, has reduced operation lift, has improved blade and has started wind speed, rated wind speed, has reduced blade overall operation efficient.
2. unsettled eddy current can cause shivering that blade is in operation, and has shortened the working life of mechanisms such as blade, transmission shaft.
As mentioned above, the application of existing blade and the some careless mistakes of all existence work in service, and demand the improver urgently; In view of considering above-mentioned operational efficiency and all the disappearances such as mechanism's shortening in working life such as causing blade, transmission shaft of shivering in service, creator's Drawing upon work is the working experience in wind electricity blade field for many years, concentrate on studies, draw the vortex generator on the utility model creation wind electricity blade surface finally.
Summary of the invention
The main purpose of the vortex generator on the utility model creation wind electricity blade surface is to solve airflow breakaway and causes blade to shift to an earlier date stall, and reduced the problem of blade aeroperformance and power conversion efficiency; An inferior purpose is to be used in blade SS face and installs vortex generator additional and obtain to increase the blade critical angle of attack that resistance reduces, lift increases; Another purpose is to be used for to stop effectively shivering that blade that unsettled eddy current causes is in operation, and prolongs the working life of mechanisms such as blade, transmission shaft.
The vortex generator on utilization the utility model creation wind electricity blade surface is characterized in that: vortex generator is that the triangle sheet is turned up and is the three-dimensional triangular-cone body with sheet metal through punching molding, between this three-dimensional triangular-cone body oppositely to arrange relatively; A plurality of vortex generators unit links, and is installed on wind electricity blade surface-type face thickness maximum region.
In order to solve the problem that blade aeroperformance that airflow breakaway causes reduces, install vortex generator additional at blade SS face.Vortex generator is mounted in a section or several sections long and narrow winglets of leading edge, mainly is to obtain a kind of step-up system that lift increases by increasing the blade critical angle of attack, and it mainly acts on is exactly to be used for stoping effectively the premature disengagement of air-flow.The action principle of vortex generator is vertically to be installed in the lip-deep low aspect ratio winglet of blade shell with an established angle, so it is the same with conventional aerofoil profile in air-flow to produce the wing tip whirlpool, but because its aspect ratio is little, so the intensity in wing tip whirlpool is stronger relatively.After mix with the low-yield airflow breakaway laminar flow in its downstream is moving in this high-octane wing tip whirlpool, just given the airflow breakaway layer energy transfer, after making the airflow breakaway lamellar field that is in the delay state obtain additional-energy, can continue to be attached to blade surface and unlikely separation the basic functional principle of Here it is vortex generator.Aerodynamic force educational circles has done a large amount of experiments at the relation of aeroperformances such as parameters such as shape, geometric parameter and the mounting point of vortex generator and lift, ratio of lift coefficient to drag coefficient.Select the major parameter and the physical dimension of vortex generator and make their optimizations according to these parameter values and aeroperformance: 1. the vortex generator position of installing: learn that according to a large amount of tests vortex generator all has drag-reduction effect in different chordwise location.Best drag reduction position is a profile thickness maximum region; Say that from flow mechanism because viscosity is to the dissipation of vortex intensity, the vortex generator mounting point is forward more, away from the separation zone, when vortex arrived at the stagnant area, its intensity had dissipated and has weakened, and the control of separation zone is also weakened thereupon.Therefore, vortex generator should could strengthen the blending of airflow breakaway layer inner fluid as much as possible near the separation zone, improves retention layer bottom liquid speed, delays airflow breakaway.Because all data all are the posterior infromations that obtains by test and test at present, there is no formula accurately and reliably.Consider that NACA series blade profile that Areodyn adopts requires height to the smoothness of leading edge, miniature vortex generator position can not be too far away apart from airflow breakaway layer defiber, its optimum position is in the thickest zone of blade SS face profile, so " we fix on the mounting point of vortex generator apart from one section of root of blade 3m~25m ".2. the setting angle of vortex generator, at interval: prove that according to a large amount of aerodynamic testings when angle of attack 〉=7 °, exhibition is to interval λ=12mm, mounting shift angle β=20 °, drag-reduction effect is better.Miniature vortex generator established angle mainly shows the intensity that produces vortex to airflow breakaway layer separating controlling effect.Mounting shift angle is too little, and the vortex intensity of generation is not strong, and is little to the blending effect of airflow breakaway intrastratal flow, and attached bottom momentum increment is little, and drag-reduction effect is just poor; Mounting shift angle is too big, vertically comes the useful area of flow path direction big, and the type resistance of generation is big.Take all factors into consideration the influence of each side, make best mounting shift angle β=20 °.In the same way, reversed dip turbulent flow produces in the same way respectively after interacting with the boundary layer, counterrotating flows to vortex row, rotating flow can produce strong control action in the part to vortex row in the same way, counterrotating flows to vortex row then can form control relatively uniformly to the boundary layer, and has the bigger control area that flows to.The root flanging and the die-cut openings limit of the three-dimensional triangular-cone body of " setting angle that is vortex generator is a reversed arrangement, and mounting shift angle is 20 ° " that is vortex generator are 20 ° of drift angles.3. the material of vortex generator: the material of vortex generator can multiple material it, for example various material such as aluminum alloy, stainless steel, plastics all have application.But consider that the blade working environment is abominable, wear resistance, the ageing-resistant performance of metal material are better than plastics, and the moulding process of aluminum alloy is simpler than stainless steel, and cost is lower." so the aluminium alloy is made vortex generator ".4. the means of fixation of vortex generator: vortex generator and leaf shell surface need strong bonded, need stable operation 20 years under abominable natural environmental condition.So need stable, a reliable mounting type.This creation considers to adopt splicing and riveting process to fix.Adopt riveting process more firm, reliable, but can embed the glass fibre reinforced plastics base material, produce stress and concentrate.Find that thickness maximum region and girder area coincidence are not easy to adopt riveting process postmenstruation behind the measurement and positioning.Adhesive technology does not influence the mechanical structure and the aerodynamic configuration of blade.So " adopt the mode of structure glue gluing ", but need the polishing of metal cement plane is coarse, with the more weak shortcoming of the cohesiveencess that overcomes structure glue and metal.
Adopt the blade of the vortex generator on the utility model creation wind electricity blade surface, can improve the aeroperformance of blade.Concrete effect following points:
1, improves the aeroperformance of blade; The blade that vortex generator is installed can improve the lift resistance ratios of blade, makes blade start under lower startup wind speed, and lower rated wind speed is issued to rated power.Under high wind speed, the power curve of output is also more steady.Under same wind regime condition, increase generated energy 3%~5%.
2, prolong the working life of blade.The irregular motion of air in the generation association of eddy current, has the vibration under a large amount of off design points when making the blade operation.The vibration of this off design point can have higher endurance requirement to blade.
Now enumerate the description of drawings and the embodiment of the vortex generator on the utility model creation wind electricity blade surface, the technical characteristics and the content of this creation are done understanding to assist the patent examination committee member, please be referring to following statement:
Description of drawings
Fig. 1 is the vortex generator schematic perspective view of the utility model creation;
Fig. 2 is the schematic representation that links of band shape for the vortex generator of the utility model creation;
Fig. 3 is the mounting point schematic representation of the vortex generator of the utility model creation;
Fig. 3 a is that the utility model creation vortex generator is in the local enlarged diagram of mounting point;
Fig. 4 installs the part section structural representation of back for the vortex generator of the utility model creation; And
Fig. 5 implements schematic representation for the single unit system of the vortex generator of the utility model creation.
Embodiment
Label declaration: vortex generator 10, three-dimensional triangular-cone body 20, wind electricity blade 30, wind electricity blade leading edge 40, wind electricity blade trailing edge 50;
See also shown in Figure 1, " vortex generator on wind electricity blade surface " that this creation is addressed, this vortex generator 10 is a sheet metal, is shaped to reverse three-dimensional triangular-cone body 20 in die-cut mode, and at the hypotenuse of three-dimensional triangular-cone body 20; Link by a plurality of vortex generators Unit 10, be the vortex generator 10 of a belt-like form, see also shown in Figure 2; Certainly, can also use the sheet metal of bar-shape, the making worker method of disposable die-cut a plurality of three-dimensional triangular-cone bodies 20; By Fig. 3 and Fig. 3 a as can be seen, the vortex generator 10 that this creation is addressed is to be installed in wind electricity blade 30 profile thickness maximum regions; Vortex generator 10 on wind electricity blade 30 surfaces, structure characteristic because of its three-dimensional triangular-cone body 20, making can be when airflow passes vortex generator 10, produce eddy current and then reach the purpose and the effect of flow-disturbing, Fig. 4 then is installed on the part section structural representation of back, wind electricity blade 30 surface for vortex generator 10, by the structure direction of high-visible vortex generator 10 in the diagram, three-dimensional triangular-cone body 20 cusps of this vortex generator 10 are to install towards wind electricity blade trailing edge 50; Fig. 5 then be vortex generator 10 in the enforcement schematic representation of wind electricity blade 30 surperficial single unit systems;
Determine the theoretical mounting point of vortex generator 10, determine the theoretical mounting point of vortex generator 10 by the mode that on wind electricity blade 30 design drawings, grasps SS profile thickest point, consider the convenience of installation, grasp mounting points every 1m, the measure theory mounting points is to the distance on wind electricity blade trailing edge 50 limits.(subordinate list 1 sees reference)
1. all theoretical mounting points in all 3m to 25m zones are coupled together markedness theory vortex generator 10 mounting point lines with straight line.
2. because of SS face profile has certain radian, for the aluminium alloy plate cambered surface of better fitting, vortex generator 10 plate bars can not be oversize; The length of setting vortex generator 10 battens is 0.5m.
At present on 3 cover wind electricity blades 30 to the layout line the position respectively to leading edge skew 5cm, 0cm ,-5cm installs vortex generator 10, with the optimum position point of further understanding vortex generator 10 settings.
The paint of aluminum alloy vortex generator 10 cement planes, wind electricity blade 30 mounting zones is coarse with the sand papering of 80# 4., be convenient to follow-up gluing.
5. with the glued vortex generator 10 of quick structure glue, the structure glue that cleaning is extruded.Treat that it solidifies the back with the space of silica gel filling vortex generator 10 with wind electricity blade 30 surfaces, floating with soap solution, level and smooth to guarantee outward appearance.
The theoretical mounting points position (subordinate list 1) of vortex generator
Sectional position/m | Apart from trailing edge distance/cm |
5? | 169.0? |
10? | 203.9? |
15? | 157.9? |
20? | 122.8? |
25? | 98.8? |
Therefore, we overlap the seat in the plane that the blower fan of having installed this creation vortex generator 10 is installed in similar wind regime with 3, observe 3 months gross generation difference; And, continue to improve the size of vortex generator 10 according to the difference of generated energy, and profile, relevant parameters such as installation parameter are so that determine best installation parameter.
Claims (6)
1. the vortex generator on a wind electricity blade surface, its feature is to be: vortex generator is that the triangle sheet is turned up and is the three-dimensional triangular-cone body with sheet metal through punching molding, between this three-dimensional triangular-cone body oppositely to arrange relatively; A plurality of vortex generators unit links, and is installed on wind electricity blade surface-type face thickness maximum region.
2. the vortex generator on wind electricity blade according to claim 1 surface, wherein, the mounting point of vortex generator is defined as apart from root of blade 3m to 25m zone.
3. the vortex generator on wind electricity blade according to claim 1 surface, wherein, it is that the mode of one band shape is made that vortex generator can be a plurality of unit combination.
4. the vortex generator on wind electricity blade according to claim 1 surface, wherein, the root flanging of the three-dimensional triangular-cone body of vortex generator and die-cut openings limit are 20 ° of drift angles.
5. the vortex generator on wind electricity blade according to claim 1 surface, wherein, the material of vortex generator is made it with aluminum alloy or stainless steel or plastic materials.
6. the vortex generator on wind electricity blade according to claim 1 surface, wherein, the device of vortex generator adopts adhesive technology to fix.
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Cited By (16)
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CN102691631A (en) * | 2011-03-22 | 2012-09-26 | 通用电气公司 | System and method for increasing energy capture by wind turbines |
CN103987622A (en) * | 2011-07-22 | 2014-08-13 | Lmwp专利控股有限公司 | Wind turbine blade comprising vortex generators |
CN104728038A (en) * | 2015-01-20 | 2015-06-24 | 河海大学 | Self-adjustment enhanced vortex generating device for horizontal-axis wind turbine |
CN105240223A (en) * | 2015-11-04 | 2016-01-13 | 苏州墨华高科信息技术有限公司 | Wind-electricity amplifier application system |
CN105324577A (en) * | 2013-06-11 | 2016-02-10 | 乌本产权有限公司 | Rotor blade of a wind turbine and wind turbine |
CN105822511A (en) * | 2016-05-16 | 2016-08-03 | 宜春学院 | Method and device for mounting eddy current generator or similar flowing control device |
CN107143470A (en) * | 2017-07-07 | 2017-09-08 | 中航瑞德(北京)科技有限公司 | Wind electricity blade is vortexed synergy component and its installation method |
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CN114580120A (en) * | 2022-05-05 | 2022-06-03 | 浙江中自庆安新能源技术有限公司 | Fan blade vortex generator optimization method and system |
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- 2009-12-30 CN CN2009202867684U patent/CN201771673U/en not_active Expired - Fee Related
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CN102691631A (en) * | 2011-03-22 | 2012-09-26 | 通用电气公司 | System and method for increasing energy capture by wind turbines |
CN103987622B (en) * | 2011-07-22 | 2019-05-28 | Lm Wp 专利控股有限公司 | Wind turbine blade including vortex generator |
CN103987622A (en) * | 2011-07-22 | 2014-08-13 | Lmwp专利控股有限公司 | Wind turbine blade comprising vortex generators |
CN105324577A (en) * | 2013-06-11 | 2016-02-10 | 乌本产权有限公司 | Rotor blade of a wind turbine and wind turbine |
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CN104728038A (en) * | 2015-01-20 | 2015-06-24 | 河海大学 | Self-adjustment enhanced vortex generating device for horizontal-axis wind turbine |
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