CN104948396A - Wind turbine blade adopting serrated blade tip tail edge structure and wind turbine - Google Patents
Wind turbine blade adopting serrated blade tip tail edge structure and wind turbine Download PDFInfo
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- CN104948396A CN104948396A CN201510434944.4A CN201510434944A CN104948396A CN 104948396 A CN104948396 A CN 104948396A CN 201510434944 A CN201510434944 A CN 201510434944A CN 104948396 A CN104948396 A CN 104948396A
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to the technical field of wind power generation, particularly to a wind turbine blade adopting a serrated blade tip tail edge structure. The wind turbine blade comprises a blade body, wherein the blade tip tail edge of the blade body is serrated. The invention further provides a wind turbine which comprises the blade serrated in blade tip tail edge, an air guide cover, an electric generator, a controller, a storage battery, an inverter and a current load. According to the wind turbine blade adopting the serrated blade tip tail edge structure, a groove is formed in the tail edge part of the blade tip of the horizontal shaft wind turbine, so that the tail edge of the blade tip is serrated, the design of the blade tip structure is improved under the premise that the cost is not increased, the process is simple, the cost is low, and the integrated design and scale production are facilitated; meanwhile, under the condition that the output power is basically constant, the blade tip noise of the wind turbine is reduced, the fatigue degree of the blade is reduced, and the service life of the wind turbine is prolonged.
Description
Technical field
The present invention relates to wind energy power technology field, especially relate to a kind of pneumatic equipment blades made of blade tip trailing edge indentation structure and there is the wind energy conversion system of flexuose blade tip structure blade.
Background technique
Along with the fast development of wind energy industry, wind energy turbine set distance residential belt is more and more nearer, and wind energy conversion system aerodynamic noise problem highlights day by day, has caused the concern of some environmental protection organizations abroad, and receives the complaint from resident near wind energy turbine set successively.For this reason, each state has formulated the regulations of wind energy conversion system aerodynamic noise being carried out to strict restriction all in succession.Wind energy conversion system aerodynamic noise problem has become one of principal element of restriction wind energy conversion system development at present, therefore urgently develops effective wind energy conversion system aerodynamic noise suppression technology.
Axis Wind Turbine With A Tip Vane is the main region that aerodynamic force produces, during the blade rotary motion of finite length, due to the pressure difference of blade tip pressure side and suction surface, cause pressure side air-flow to walk around leaf apex end surface and flow into suction surface, both destroyed blade tip two-dimensional flow situation, and can tip vortex have been produced simultaneously.Tip vortex causes the one of the main reasons that blade efficiency reduces, fatigue load increases.In order to improve the power coefficient of wind energy conversion system and reduce wind energy conversion system noise, the researcher of countries in the world proposes various method, the aerofoil profile of the blade optimized as adopted aeroperformance, design low-noise high-efficiency, increase diffuser (Diffuser) in wind wheel periphery, add wing flap at trailing edge, add winglet (Tip Vane) etc. at blade tip.Above research method is all change wind energy conversion system aerodynamic characteristic to reduce wind energy conversion system aerodynamic noise by adding pneumatic original paper and design new blade on blade after blade design completes, and does not have not start with from blade design root to deal with problems.
Summary of the invention
The present invention, at horizontal-shaft wind turbine blade tip fluting, makes tip structure change, blade tip trailing edge indentation, under the prerequisite not increasing cost, Curve guide impeller is carried out to tip structure, reduce Axis Wind Turbine With A Tip Vane noise, reduce the degree of fatigue of blade, extend wind energy conversion system working life.
The pneumatic equipment blades made of a kind of blade tip trailing edge indentation structure provided by the invention, is characterized in that, comprise blade body, the blade tip trailing edge indentation of blade body.
Further, the length of blade tip trailing edge sawtooth is 10% of blade body length.
Present invention also offers a kind of wind energy conversion system, comprise the blade of blade tip trailing edge indentation, air guide sleeve, generator, controller, storage battery, inverter and current loading; Air guide sleeve is positioned at the front end of blade, and generator is positioned at the rear portion of blade, and generator, storage battery are all electrically connected with controller, and storage battery, current loading are all electrically connected with inverter.
The pneumatic equipment blades made of a kind of blade tip trailing edge indentation structure provided by the invention; slot at horizontal-shaft wind turbine blade tip trailing edge position; make blade tip trailing edge indentation; under the prerequisite not increasing cost, Curve guide impeller is carried out to tip structure; technique is simple; expense is low, is convenient to integrated design, is produced on a large scale.Meanwhile, when ensureing that output power is substantially constant, reducing Axis Wind Turbine With A Tip Vane noise, reducing the degree of fatigue of blade, extend wind energy conversion system working life.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schematic diagram at the pneumatic equipment blades made blade tip position of the blade tip trailing edge indentation structure that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is testing section point layout schematic diagram when territory, wind energy conversion system near-wake region angle of swing that the embodiment of the present invention provides is 90 °;
Fig. 3 is the wind speed of wind energy conversion system and the relationship change plotted curve of power before and after blade tip of the present invention remodeling;
Fig. 4 is wind speed and the power coefficient change curve of wind energy conversion system before and after blade tip of the present invention remodeling;
Fig. 5 is that before and after blade tip of the present invention remodeling, wind energy conversion system is in tip-speed ratio λ=7.5, and x=30cm, tests 7 measuring points rotation fundamental frequency noise variation diagrams that angle of rotation is 90 °;
Fig. 6 is that before and after blade tip of the present invention remodeling, wind energy conversion system is in tip-speed ratio λ=7.5, and x=30cm, test angle of rotation is the tip vortex shedding frequence noise variation diagram of 7 measuring points of 90 °.
Embodiment
Be clearly and completely described technological scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
As shown in Figure 1, the pneumatic equipment blades made of a kind of blade tip trailing edge indentation structure provided by the invention, is characterized in that, comprise blade body, the blade tip trailing edge indentation of blade body.The geometric parameter of sawtooth blade tip trailing edge comprises sawtooth height H and blade tip trailing edge sawtooth length L, and length L is 10% of blade body length.
Present invention also offers a kind of wind energy conversion system, comprise the blade of blade tip trailing edge indentation, air guide sleeve, generator, controller, storage battery, inverter and current loading; Air guide sleeve is positioned at the front end of blade, and generator is positioned at the rear portion of blade, and generator, storage battery are all electrically connected with controller, and storage battery, current loading are all electrically connected with inverter.
Based on the empty theory of mechanics of wind energy conversion system air, key parameter (as tip speed ratio, rotor diameter, reynolds' number, Airfoil Aerodynamic Performance and the blade loading etc.) impact on wind mill performance of labor research blade; And then on whole blade design, adopt the wind mill airfoil series of brand-new design, propose with Maximun power coefficient and unit area Energy Maximization as Model for Multi-Objective Optimization, with chord length, torsional angle for design variable, effective control blade loading, to improve blade fatigue life, sets up novel wind motor blade design and optimized mathematical model.Apply this to design a model, when rated output coefficient, thrust coefficient and moment coefficient, partial power's coefficient in each infinitesimal foline face, thrust coefficient and moment coefficient are carried out the cumulative summation of multistage, obtain the aeroperformance coefficient of whole blade.Adopt the method design pneumatic equipment blades made profile and blade tip profile and retrofit, obtain the pneumatic equipment blades made of blade tip trailing edge indentation.
Design concrete steps:
The first step considers the probability distribution of the actual wind field of pneumatic equipment blades made, carries out computation and analysis to wind energy conversion system DESIGNED FEATURE wind speed;
Second step, by comparative analysis, chooses the good wind mill airfoil of aeroperformance; With the unit area generated energy of wind energy conversion system for objective function, adopt the sub-continuous multi-stage superposition method of reason to combine the optimizing Design Software developed, determine blade key parameter, design a model pneumatic equipment blades made;
3rd step is carried out local improving to the blade profile parameter that wind mill airfoil constructs and is repaiied type, mainly for blade tip remodeling, obtains the pneumatic equipment blades made of blade tip trailing edge indentation.
In order to the noise characteristic of accurate full test blade tip trailing edge indentation and the adenticulate wind energy conversion system of blade tip trailing edge, acoustic array method 7 measuring points on the holding wire of wind wheel plane of rotation 30cm cross section angle of swing when being 90 ° of adjusting the distance are utilized to test.Its test zone 3-D walls and floor is defined as, be wind wheel plane of rotation with wind wheel rotational axis vertical and by the plane definition of pneumatic equipment blades made blade tip aerofoil profile leading edge point, the intersection point of wind wheel running shaft and this plane is wind wheel rotating center, outwards moves horizontally 30cm be set to true origin O along wind wheel rotating center to wind wheel plane of rotation radial direction.Each measuring point interval 10cm on holding wire, shown in concrete test arrangement schematic diagram 2.
In the present embodiment, test sawtooth blade tip trailing edge structures parameter is height H=0.87cm, and zigzag fashion is equilateral triangle pointed tooth, and angle is 60 °, and the external characteristics of the wind energy conversion system of blade tip trailing edge sawtooth entire length L=6.5cm, wind energy conversion system contrasts with not retrofiting.Test method utilizes load constant, and the test method(s) changing incoming flow wind speed measures the change of wind energy conversion system output power and power coefficient Cp, and it the results are shown in Figure 3 and Fig. 4.As seen from Figure 3, in the wind energy conversion system output power of 3-8m/s wind speed range sawtooth blade tip trailing edge structures lower than blade tip wind energy conversion system output power of not retrofiting, in the wind energy conversion system output power of the wind speed range sawtooth blade tip trailing edge structures of 8-14m/s apparently higher than blade tip wind energy conversion system output power of not retrofiting.Equally as seen from Figure 4, at the wind energy conversion system power coefficient of 3-8m/s wind speed range sawtooth blade tip trailing edge structures lower than blade tip wind-force power coefficient of not retrofiting, at the wind energy conversion system power coefficient of the wind speed range sawtooth blade tip trailing edge structures of 8-14m/s apparently higher than blade tip wind energy conversion system power coefficient of not retrofiting.It is 4m/s that the wind energy conversion system power coefficient maximum value 0.354 of sawtooth blade tip trailing edge structures appears at incoming flow wind speed, and it is 5m/s that blade tip wind energy conversion system power coefficient maximum value 0.364 of not retrofiting appears at incoming flow wind speed.As can be seen here, sawtooth blade tip trailing edge structures has considerable influence to wind energy conversion system power performance in middle high wind speed section, less in low wind speed section impact.Power corresponding to rated wind speed 13m/s is respectively the blade tip wind energy conversion system 316W that do not retrofit, the wind energy conversion system 313W of sawtooth blade tip trailing edge structures.By calculating, the wind energy conversion system power drop 0.95% of sawtooth blade tip trailing edge structures.It can thus be appreciated that the blade tip trailing edge zigzag structure wind energy conversion system after remodeling affects little on wind energy conversion system power and wind energy utilization.
In the present embodiment, by the analysis to specified tip-speed ratio λ=7.5 time blade tip remodeling anterior-posterior horizontal axle wind mill wind wheel blade tip downstream 3D region noise pattern, the spectrogram of Axis Wind Turbine With A Tip Vane noise region is that tip vortex shedding frequence, the wind-tunnel power fan mainly produced by the rotation fundamental frequency of wind wheel blade and harmonic wave, blade rotary rotates the frequency produced and form.We adopt sawtooth blade tip trailing edge structures parameter to be height H=0.87cm, zigzag fashion is equilateral triangle pointed tooth, angle is 60 °, the wind energy conversion system of blade tip trailing edge sawtooth entire length L=6.5cm, then the wind energy conversion system after not retrofiting and retrofiting is tested when incoming flow wind speed 13m/s, tip-speed ratio λ=7.5, Fig. 5 is shown in the change of the rotational noise corresponding to rotation fundamental frequency 72Hz that x=30cm tests 7 measuring points that angle of rotation is 90 °, and Fig. 6 is shown in the blade tip noise change corresponding to tip vortex shedding frequence 357Hz.
As seen from Figure 5, the impact that sawtooth pattern blade tip trailing edge structures produces the rotational noise of wind wheel, the spectrogram peaks corresponding to the frequency of rotation fundamental frequency and harmonic relationships thereof is made to have obvious downward trend, it rotates fundamental frequency noise changing value wave range-0.71% to-4.95%, on average reduces 2.83%.Find have tip vortex to pass through at measuring point 5 and measuring point 6, the sound pressure level of measuring point 5 and measuring point 6 rotational noise is raised.As seen from Figure 6, the impact that sawtooth pattern blade tip trailing edge structures produces tip vortex noise figure, its tip vortex noise changing value wave range is-0.99% to-5.71%, on average reduce 3.76%, and prove have tip vortex to pass through between measuring point 5 and 6 further, the sound pressure level of this tip vortex noise is raised, but all lower than blade tip of not retrofiting.It can thus be appreciated that the sawtooth pattern blade tip trailing edge structures after remodeling effectively reduces Axis Wind Turbine With A Tip Vane noise.
Find that sawtooth blade tip trailing edge structures has considerable influence to wind energy conversion system power performance in middle high wind speed section by the test of wind energy conversion system external characteristics, less in low wind speed section impact.Be 13m/s at incoming flow wind speed, tip-speed ratio λ=7.5 time, testing angle of rotation by the blade tip downstream of wind energy conversion system of not retrofiting to sawtooth pattern blade tip trailing edge structures wind energy conversion system and blade tip is that 7 measuring points of 90 ° are tested, find that the spectrogram peaks corresponding to frequency that sawtooth pattern blade tip trailing edge structures makes wind wheel rotate fundamental frequency and harmonic relationships thereof has obvious downward trend, on average reduce 2.83%.Sawtooth pattern blade tip trailing edge structures has an impact to the spectrogram peaks corresponding to the shedding frequence of tip vortex simultaneously, makes it maximum reduction by 5.71%.
By the remodeling to tip structure, the pneumatic equipment blades made of a kind of blade tip trailing edge indentation structure provided by the invention and wind energy conversion system, when ensureing that output power is substantially constant, reduce Axis Wind Turbine With A Tip Vane noise, reduce the degree of fatigue of blade, extend wind energy conversion system working life.
Last it is noted that above each embodiment is only in order to illustrate technological scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technological scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristics; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technological scheme.
Claims (3)
1. a pneumatic equipment blades made for blade tip trailing edge indentation structure, is characterized in that, comprise blade body, the blade tip trailing edge indentation of described blade body.
2. a pneumatic equipment blades made for trailing edge indentation structure, is characterized in that, the length of described blade tip trailing edge sawtooth is 10% of described blade body length.
3. a wind energy conversion system, is characterized in that, comprises the blade of blade tip trailing edge indentation as claimed in claim 1, air guide sleeve, generator, controller, storage battery, inverter and current loading;
Described air guide sleeve is positioned at the front end of described blade, and described generator is positioned at the rear portion of described blade, and described generator, described storage battery are all electrically connected with described controller, and described storage battery, described current loading are all electrically connected with described inverter.
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| CN201510434944.4A CN104948396B (en) | 2015-07-22 | 2015-07-22 | Blade tip trailing edge is serrated the pneumatic equipment bladess and wind energy conversion system of structure |
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| CN201510434944.4A CN104948396B (en) | 2015-07-22 | 2015-07-22 | Blade tip trailing edge is serrated the pneumatic equipment bladess and wind energy conversion system of structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109386426A (en) * | 2017-08-09 | 2019-02-26 | 新疆工程学院 | The pneumatic equipment bladess and wind energy conversion system of a kind of linear micro- cavernous structure of trailing edge |
| CN109386425A (en) * | 2017-08-09 | 2019-02-26 | 新疆工程学院 | The pneumatic equipment bladess and wind energy conversion system of a kind of linear micro- cavernous structure of blade inlet edge |
| CN110145491A (en) * | 2019-07-07 | 2019-08-20 | 代元军 | A kind of blade tip rear is in the mining partial axial ventilator of saw-tooth-type structures |
| CN111237254A (en) * | 2018-11-29 | 2020-06-05 | 湖南科技大学 | Aviation compressor blade with noise reduction function under high Reynolds number condition |
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| CN110145491A (en) * | 2019-07-07 | 2019-08-20 | 代元军 | A kind of blade tip rear is in the mining partial axial ventilator of saw-tooth-type structures |
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| CN104948396B (en) | 2017-12-05 |
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Inventor after: Dai Yuanjun Inventor after: Li Baohua Inventor after: Yuan Xingbiao Inventor after: Ren Changzai Inventor after: Cui Zutao Inventor after: Zhou Linyuan Inventor before: Dai Yuanjun Inventor before: Li Baohua Inventor before: Yuan Xingbiao Inventor before: Ren Changzai Inventor before: Cui Zutao Inventor before: Zhou Linyuan |
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