CN102141000A - Method for designing pre-twisting sweepback wind turbine blade - Google Patents
Method for designing pre-twisting sweepback wind turbine blade Download PDFInfo
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- CN102141000A CN102141000A CN2010191140770A CN201019114077A CN102141000A CN 102141000 A CN102141000 A CN 102141000A CN 2010191140770 A CN2010191140770 A CN 2010191140770A CN 201019114077 A CN201019114077 A CN 201019114077A CN 102141000 A CN102141000 A CN 102141000A
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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
The invention relates to a method for designing a pre-twisting sweepback wind turbine blade. The main steps: 1) setting the sweepback wind turbine blade as a rigid body, carrying out blade pneumatic design, and designing a torsional angle of a blade at each section; 2) analyzing and calculating the angle deformation amount of each section for materials and structural properties of the blade in the step 1 according to the loading condition of pneumatic design; and 3) carrying out equivalent pre-twisting to the opposite direction for the torsional angle of the blade obtained from the design of the step 1 according to the angle deformation amount calculated from the step 2, thus new torsional angle of the blade at each section is obtained. Through the pre-twisting sweepback wind turbine blade designed by the invention, the optimal torsional angle at each section of the blade at a rated wind speed can be ensured, thus the throughput loss can be reduced.
Description
Technical field
The present invention relates to a kind of wind-power electricity generation sweepback linear leaf, relate to a kind of design method of pretwist sweepback pneumatic equipment blades made particularly.
] technical background
Be on the rise along with global climate warms, Abnormal Phenomena on Climate constantly occurs, and CO2 reduces discharging pressure and strengthens, and fossil energy is in short supply simultaneously, and price climbs up and up, and renewable and clean energy resource more and more is subjected to the favor of each major country.Wind energy relies on that its reserves are big, wide, the cleanliness without any pollution of distributing, overall cost is lower and in degradation advantage down, is called as one of the most promising generation mode.
1993 to 2008 15 in the period of, the annual growth of world's wind-power electricity generation installation total amount reaches 28.26%.To the year ends 2008, global wind-powered electricity generation electric motor power reaches 1.2 hundred million kilowatts, the wind-power electricity generation amount in global gross generation proportion from 2000 0.25% rise to 2008 1.5%.EWEA expects the year two thousand twenty wind-power electricity generation will account for 12% of world's electric power total amount.Wind energy is subjected to the generally attention of countries in the world as the strategic position of future source of energy supply important component part.
The THE WIND ENERGY RESOURCES IN CHINA reserves are abundant, and according to preresearch estimates, the wind energy resources of the land overhead 10 meters height layers of China can the exploitation amount be 2.53 hundred million kilowatts; The wind energy content of off sea 10 meters height layers of greater coasting area is about 7.5 hundred million kilowatts.On macroscopic view, China possesses the resources supplIes of extensive development wind-power electricity generation.To the end of the year 2008, China's wind-power electricity generation accumulative total electric motor power reaches 1,221 ten thousand kilowatts, annual growth surpassed 100% in continuous the 3rd year, the wind-powered electricity generation total installation of generating capacity still was expected to continue to be doubled growth in 2009, at this rate, China or will realize 3,000 ten thousand kilowatts of development plan targets of wind-powered electricity generation of the year two thousand twenty in advance in 2010.
In order to realize the scale utilization of wind energy, reduce the Wind Power Utilization cost, the wind-powered electricity generation unit just develops towards large scale, high flexibility, powerful direction.Because the large-scale blades rigidity is less, when bearing aerodynamic loading, deform easily, distortion can bring the loss of absorbed power, this distortion generally is not the designing institute expectation, but this servo distortion but can reduce wind speed sudden change and the extreme wind speeds destruction to blade, for further utilizing this characteristic, the design philosophy of sweepback self-adaption leaf blade is suggested, estimate that the blade of this structure can reduce the fatigue load of 20-30%, thereby reduce the fatigue ruption of 20-70%, this is a considerable income.But because the torsional angle in each cross section of sweepback pneumatic equipment blades made changes with aerodynamic force, the pneumatic efficiency under the blade rated wind speed can descend, thereby loses certain function force that spendes.
Summary of the invention
The object of the invention is to provide a kind of design method of pretwist sweepback pneumatic equipment blades made, by the sweepback pneumatic equipment blades made being carried out the pretwist design, realizes the efficient wind energy utilization.
For achieving the above object, the design method of pretwist sweepback pneumatic equipment blades made provided by the invention, key step is:
1) the sweepback pneumatic equipment blades made is made as rigid body, carries out the blade pneumatic design, design the twist angle of blade of each section;
2),, carry out analysis meter and calculate each angle of section amount of deformation according to the load condition of pneumatic design with the blade material in the step 1, structural characteristics;
3) according to the angular distortion amount of calculating in the step 2, the twist angle of blade that design obtains to step 1, equivalent pretwist round about obtains the twist angle of blade of each new section.
Wherein step 2 is to adopt known structure analysis software (as: MSC.Patran/Nastran) analysis meter to calculate each angle of section amount of deformation.
After considering that twist angle of blade changes, aerodynamic loading will change, and this will cause in the unit operation, may not necessarily just in time be in the target torsional angle of backward-swept blade behind the deformable blade.Therefore the present invention is necessary the blade through step 3 design is repeated the process of step 2 and step 3, until satisfying blade after distortion, can just in time be in the target torsional angle of backward-swept blade, or reach approximate torsional angle position, be the pretwist sweepback pneumatic equipment blades made of final design.
The present invention compared with prior art has following tangible substantive features and remarkable advantage:
The present invention adopts pretwist sweepback pneumatic equipment blades made, both has been convenient to realize the automatic control of the load of blade, and it is impaired to reduce blade; Guarantee that again blade is in design conditions when normally moving, keep higher wind energy absorption efficiency.
Description of drawings
Fig. 1 is a sweepback horizontal-shaft wind turbine structure, and wherein: 1 is the wind wheel hub, and 2 are the sweepback pneumatic equipment blades made, and 3 is pylon.
Fig. 2 is the sweepback pneumatic equipment blades made.
Fig. 3 is when not considering pretwist, the blade profile torsional angle value of departing from objectives schematic representation, and wherein: 4 is blade profile target torsional angle position, and 5 is torsional angle position after the blade profile torsional deflection.
Fig. 4 is the present invention when considering pretwist, and the blade profile torsional angle returns to the desired value schematic representation, and wherein: 4 ' is the best torsional angle of blade profile target position, and 6 is the torsional angle position, design section of pretwist sweepback pneumatic equipment blades made.
Embodiment
The present invention adopts following technological scheme:
Setting blade earlier is rigidity, carries out the design of sweepback pneumatic equipment blades made, makes can both be under the best angle of attack at rated wind speed lower blade arbitrary section, realizes maximum utilization this moment of wind energy, and each sectional position of blade can obtain according to known Pneumatic design method.Target torsional angle location status when as shown in Figure 3, position 4 is normally moved for a certain section of blade.
In fact, blade structure is non-rigid body, simultaneously because the blade sweepback causes torsional rigidity to reduce relatively.Therefore, the sweepback wind electricity blade waits under the loading pneumatic, will bigger torsional deflection take place.Under known blade structure, material and aerodynamic loading distributed data situation, can adopt structure analysis methods such as finite element, calculate each section torsional deflection amount of blade.As shown in Figure 3, a certain blade profile place, the target torsional angle position of design is 4, has become torsional angle position 5 after the distortion, has departed from design conditions.This will cause the reduction of blade aeroperformance.
The present invention is for eliminating the harmful effect of torsional deflection to the backward-swept blade aeroperformance, according to each cross section torsional deflection amount that the front calculated, design on the basis of aerodynamic configuration for rigid body at the hypothesis blade, again reversing to a certain degree carried out in each cross section of blade, windup-degree is identical with front resiliently deformable analysis result, and torsional direction is opposite with the analysis result direction.As shown in Figure 4, torsional angle position 6 is the torsional angle position, cross section of designed pretwist sweepback pneumatic equipment blades made.This blade is in operation, the pneumatic grade under the loading under rated wind speed, and the distortion that twists reaches the torsional angle position of the blade 4 ' among Fig. 4, i.e. She Ji target torsional angle position.
According to above scheme, pretwist sweepback vane design of wind turbines process is as follows:
1) the sweepback pneumatic equipment blades made is considered as rigid body, carries out the blade pneumatic design, design the twist angle of blade of each section, be i.e. the target torsional angle of backward-swept blade.
2) blade in the step 1 is given characteristics such as material, structure, according to the load condition of pneumatic design in the step 1, structure analysis softwares such as use MSC.Patran/Nastran are analyzed, and calculate each angle of section amount of deformation.
3) according to the angular distortion amount of calculating in the step 2, the twist angle of blade that design in the step 1 is obtained, equivalent pretwist round about obtains the twist angle of blade of each new section.And produce new Blade Design profile with this.
4) consider that twist angle of blade changes after, aerodynamic loading will change, this will cause in the unit operation, may not necessarily just in time be in the target torsional angle of backward-swept blade behind the deformable blade.Be necessary until satisfying blade after distortion, can just in time be in the target torsional angle of backward-swept blade, or reach approximate torsional angle position the process of newly-designed blade repeating step 2 to step 3.
5) having satisfied blade in the step 4, is the pretwist sweepback pneumatic equipment blades made of final design.
The length of sweepback pneumatic equipment blades made is 15 meters, and from 5 meters to 15 meters section sweepback of blade root, its design process demonstration is as follows:
1) the sweepback pneumatic equipment blades made is considered as rigid body, carries out the blade pneumatic design, design the twist angle of blade of each section, be i.e. the target torsional angle of backward-swept blade.Torsional angle between initial cross section of wherein sweepback section and top differs 10 degree.
2) blade in the step 1 is given characteristics such as material, structure,, used the MSC.Patran/Nastran structure analysis software to analyze, calculate each angle of section amount of deformation according to the load condition of pneumatic design in the step 1.Its middle period top torsional angle has reduced 3 degree.
3) according to the angular distortion amount of calculating in the step 2, the leaf top section be-3 degree, the twist angle of blade that design in the step 1 is obtained, and equivalent pretwist round about obtains the twist angle of blade of each new section, and its middle period top section torsional angle is 13 to spend.And produce new Blade Design profile with this.
4) after twist angle of blade changes, aerodynamic loading will change, in the unit operation, still can not just in time be in the target torsional angle of backward-swept blade behind the deformable blade, to the blade repeating step 2 after the design to the process of step 33 times, satisfy blade after distortion, near the target torsional angle of backward-swept blade, leaf top torsional angle reaches 10.012 degree.Being out of shape front vane leaf top torsional angle this moment is 12.5 degree.Like this, during the wind wheel operation, can guarantee that the torsional angle in each cross section is in target torsional angle position.
Claims (3)
1. the design method of a pretwist sweepback pneumatic equipment blades made, key step is:
1) the sweepback pneumatic equipment blades made is made as rigid body, carries out the blade pneumatic design, design the twist angle of blade of each section;
2),, carry out analysis meter and calculate each angle of section amount of deformation according to the load condition of pneumatic design with the blade material in the step 1, structural characteristics;
3) according to the angular distortion amount of calculating in the step 2, the twist angle of blade that design obtains to step 1, equivalent pretwist round about obtains the twist angle of blade of each new section.
2. design method according to claim 1, wherein, step 2 is to adopt MSC.Patran/Nastran structure analysis software analysis meter to calculate each angle of section amount of deformation.
3. design method according to claim 1, wherein, the blade that step 3 is obtained repeats the process of step 2 to step 3, until satisfying blade after distortion, can just in time be in the target torsional angle of backward-swept blade, or reaches approximate torsional angle position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010191140770A CN102141000B (en) | 2010-02-03 | 2010-02-03 | Method for designing pre-twisting sweepback wind turbine blade |
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| CN2010191140770A CN102141000B (en) | 2010-02-03 | 2010-02-03 | Method for designing pre-twisting sweepback wind turbine blade |
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| CN102141000A true CN102141000A (en) | 2011-08-03 |
| CN102141000B CN102141000B (en) | 2012-11-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305175A (en) * | 2011-08-19 | 2012-01-04 | 天津大学 | Blade of wind driven generator |
| CN105888963A (en) * | 2016-04-07 | 2016-08-24 | 扬州大学 | Low-wind-speed wind turbine blade |
| CN113719408A (en) * | 2021-09-23 | 2021-11-30 | 中国华能集团清洁能源技术研究院有限公司 | Sweepback blade of wind turbine generator and wind turbine generator |
-
2010
- 2010-02-03 CN CN2010191140770A patent/CN102141000B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305175A (en) * | 2011-08-19 | 2012-01-04 | 天津大学 | Blade of wind driven generator |
| CN102305175B (en) * | 2011-08-19 | 2013-04-24 | 天津大学 | Blade of wind driven generator |
| CN105888963A (en) * | 2016-04-07 | 2016-08-24 | 扬州大学 | Low-wind-speed wind turbine blade |
| CN113719408A (en) * | 2021-09-23 | 2021-11-30 | 中国华能集团清洁能源技术研究院有限公司 | Sweepback blade of wind turbine generator and wind turbine generator |
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| Publication number | Publication date |
|---|---|
| CN102141000B (en) | 2012-11-14 |
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