CN101865081A - A device and method for adjusting the output power of a rotating blade by using a leading edge rudder blade - Google Patents
A device and method for adjusting the output power of a rotating blade by using a leading edge rudder blade Download PDFInfo
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Abstract
本发明涉及风力发电机，是一种利用前缘舵片调节旋转叶片输出功率的装置及方法。通过在旋转叶片前缘加装一定数量的舵片，利用舵片在不同姿态角下产生的强旋涡流动对叶片上表面的流动特性进行主动干预，改变其原有的气动特性，使叶片在较大运行工况范围内保持稳定的输出功率；舵片具有滚转和俯仰两个转动自由度，实际控制过程中，既可以使所有舵片保持统一的姿态角，又可以根据需要单独调整每一个舵片的姿态角。本发明提供的装置，设计更加简单，控制更加灵活和精细，能够有效改善旋转叶片在大风速非设计工况时的气动性能，提高风力发电机组的运行效率。
The invention relates to a wind power generator, and relates to a device and a method for adjusting the output power of rotating blades by using leading edge rudder blades. By installing a certain number of rudder vanes on the leading edge of the rotating blade, the strong vortex flow generated by the rudder vanes at different attitude angles is used to actively intervene in the flow characteristics of the upper surface of the blade, changing its original aerodynamic characteristics, and making the blade move at a relatively high speed. Maintain stable output power in a wide range of operating conditions; the rudder blades have two degrees of freedom of rotation, roll and pitch. The attitude angle of the rudder blade. The device provided by the invention has simpler design, more flexible and fine control, can effectively improve the aerodynamic performance of the rotating blades in high wind speed non-design working conditions, and improve the operating efficiency of the wind power generating set.
Description
Technical field
The present invention is a kind of device and method that utilizes front edge rudder pieces to regulate the wind-driven generator output power of rotating blade.
Background technique
Rotation blade has obtained extensive use as a kind of energy conversion device in the wind-power electricity generation industry.By the effect of rotation blade, wind-driven generator is converted to electric energy with wind energy, and is exported.
In order from air, to extract the operational efficiency of wind energy, raising wind-driven generator to greatest extent, when the design wind-driven generator, all need usually rotation blade is optimized design.Rotation blade after the optimal design can make the generating efficiency of wind-driven generator the highest with the operation such as (as rated wind speed) under the design conditions of a certain appointment of the aeroperformance of the best.
But in the actual moving process of blower fan, be subjected to the influence of natural condition (as weather, landform, landforms etc.), the air-flow that acts on rotation blade is always complicated, changeable.Therefore, except specific design conditions (being declared working condition), wind-driven generator also must possess the ability of moving under off-design behaviour.Under these off-design behaviours, the velocity magnitude of air-flow, direction may significantly depart from the rated wind speed condition.When moving under this class off-design behaviour, the aeroperformance of rotation blade is the off-design state inevitably, causes the operational efficiency of wind-driven generator to decline to a great extent; Under the extremity, even may influence the safe operation of generator set.Therefore, in order to guarantee rotation blade stable operation under all operating modes, wind-driven generator all must be provided with a cover control system, adjusts the aerodynamic characteristic of blade under off-design behaviour and the output power of whole wind power generator with this.
At present, the Poewr control method of wind-driven generator mainly contains two kinds: feather control and stall control.
(1) feather control
By adjusting the blade pitch angle, this controlling method can reduce the air-flow angle of attack of blade under big wind speed off-design behaviour, thereby makes the output power of rotation blade keep stable in big wind speed range.
(2) stall control
Stall control can be subdivided into deliberate speed loss control again and passive stall is controlled two kinds.Stall is a kind of common flowing state.When the air-flow angle of attack surpassed certain limit, aerodynamic configuration (as aerofoil profile, fan blade etc.) was surperficial with the occurrence of large-area flow separation, thereby causes its aeroperformance to decline to a great extent.Stall control is exactly to utilize output power that this rule suppresses rotation blade excessive increase when big wind speed off-design behaviour, to reach the purpose of protection generator set.
Feather control is the main flow of current large-scale wind driven generator development.But also there is apparent in view defective in this controlling method, mainly comprises following several aspect:
(1) control mechanism is complicated and expensive;
(2) corresponding variations in flow speed, the control rate of feather is slower, long, response lag of flow response time;
(3) to change that each exhibition of rotation blade caused changes to the local angle of attack of position be non-linear to wind speed, but feather control can only be at the unified adjustment in blade root place attack angle of blade, so feather is controlled the angle of attack correction effect of being introduced, and each exhibition is different to the position to blade, this causes the aeroperformance of relevant position also to have nothing in common with each other, the vane stress inequality;
(4) feather is controlled under the driftage state and lost efficacy, therefore must be earlier when blower fan is in the driftage state by to wind apparatus to wind, and then carry out feather according to flowing state and control.
Just because of there being above-mentioned defective, therefore in the actual moving process of blower fan, feather control may cause significantly the power swing of (as 100%).
Compare with variable pitch control method, stall control has advantages such as control mode is simple, be the first-selection of early development wind-driven generator therefore, but its shortcoming is also very outstanding:
(1) stall causes the blade aeroperformance sharply to descend, and the non-permanent feature that flows is outstanding, thereby causes that the blower fan generating efficiency significantly reduces, the non-permanent pulsation feature of output power significantly strengthens;
(2) stall has aggravated the aeroelasticity distortion of blade self, and long-time running will cause decline to a great extent the working life of blower fan in the stall zone;
(3) stall control is not suitable for the driftage state equally.
In addition, also there are some patented technologies to adopt vortex generator to revise the output power of fan blade, as CN101539119-A, US20090285682A1, WO2009080316-A2, WO2009026928-A2 etc.In this class patented technology, the disturbance eddy current that utilizes vortex generator to produce can impel flowing of the upper and lower surface of blade to separate in advance and stall.But, because the common yardstick of these vortex generators very little (as the millimeter magnitude), and be arranged in the upper and lower surface of blade more.In case flow separation has taken place in these zones, then vortex generator will no longer work.Therefore, the operating mode scope that these controlling schemes are suitable for is less, and the control effect is more limited.
Summary of the invention
At the power control problem of rotation blade under big wind speed off-design behaviour, this patent has proposed a kind ofly to control new method and the relevant control rudder sheet design proposal that blade is exerted oneself based on front edge rudder pieces.
The central idea of this patent is in the rotation blade leading edge a series of control rudder sheets to be installed, and guarantees that by the state of a control (as roll attitude angle φ and pitch attitude angle Δ α) of adjusting the rudder sheet continual and steady fan blade is exerted oneself and generated output output under each stream condition.Fig. 1 and Fig. 2 be two kinds of state of a controls of corresponding rudder sheet respectively.Wherein, the state of a control of the corresponding rudder sheet of Fig. 1 when design conditions (as rated wind speed), the state of a control of the then corresponding rudder sheet of Fig. 2 when big wind speed off-design behaviour.
The technological scheme of this patent is as follows:
Increase a series of rudder sheets on the rotation blade of wind-driven generator, described rudder sheet is positioned at the rotation blade leading edge; Described rudder sheet links to each other with the interior control mechanism of blade by connecting rod member; Described rudder sheet is carried out two kinds of actions by control mechanism control: around rudder sheet self symmetry axis make rolling movement and along the rotation blade exhibition to doing pitching movement, its range of movement corresponds respectively to roll attitude angle φ and pitch attitude angle Δ α; The attitude angle of each rudder sheet (6) can both be adjusted separately, and the attitude angle of all rudder sheets also can be unified to adjust.
The spacing l value of adjacent rudder sheet is 1/8～1/2 of blade chord length c; The length a value of rudder sheet self is 5%～30% of adjacent rudder sheet spacing l.
Described rudder sheet is positioned at rotation blade 50% and opens up the blade inlet edge that grows between the blade tip (5).
0 °～180 ° of the control ranges of described roll attitude angle φ, the control range of pitch attitude angle Δ α are-60 °～30 °.
The manufactured materials of described rudder sheet can adopt glass fibre/carbon fiber composite, reinforced aluminum, steel or other metal materials.
Described rudder sheet is the delta wing shape, and rudder sheet sectional shape is two arcs; The span of rudder plate shape angle (sweepback angle) Λ is 30 °～80 °, and the span of long a is 0.05～0.3 times of rudder sheet spacing l, wide b=2a * cot Λ, thickness t≤0.1a.
The assemblage gap δ of rudder sheet and blade inlet edge is less than 0.2 times of rudder leaf length a.
The present invention provides a kind of method of utilizing above-mentioned controlling device to regulate rotation blade face output power simultaneously, step is as follows: in the wind-driven generator running, control system is according to the variation of wind speed and motor output power, continue the roll attitude angle φ and the pitch attitude angle Δ α of rudder sheet are adjusted, in the blower fan output power drops on rational interval range.
The main advantage of the art of this patent is as follows:
(1) because the front edge rudder pieces volume is little, himself suffered aerodynamic force is also very little.Therefore, with respect to feather control, the art of this patent can be more promptly responded the instantaneous perturbation of air-flow, and control rate is fast, the response time is short;
(2) because rudder sheet volume is little, self suffered aerodynamic force is little, can designs very simply so be used for the control system of control vane sheet, and can be arranged in the blade interior cavity very neatly;
(3) this patent has been installed a series of control rudder sheets in the rotation blade leading edge, and can control separately the attitude angle of each rudder sheet as required, thereby each exhibition is carried out meticulous control to the aerodynamic condition of position to blade, and this advantage is that current each controlling method is not available;
(4) when being in the driftage state, each exhibition of blade will the cyclically-varying with the blade rotation to the local angle of attack of position.In this patent, by the roll attitude angle φ of real-time adjustment front edge rudder pieces, the periodically pulsing of can effectively eliminating this class because the blade that caused of asymmetry air-flow is exerted oneself.
Utilize apparatus and method provided by the invention, the rotation blade of wind-driven generator is responded the instantaneous perturbation of air-flow more promptly, control rate is fast, the response time is short; The Control System Design that is used for the control vane sheet is fairly simple, and can be arranged in the blade interior cavity very neatly; Can control separately the attitude angle of each rudder sheet as required, thereby each exhibition is carried out meticulous control to the aerodynamic condition of position to blade, this advantage is that current each controlling method is not available; The art of this patent can effectively be improved the aeroperformance of rotation blade when big wind speed off-design behaviour, improves the operational efficiency of wind power generating set.
Description of drawings
Fig. 1: rotation blade and front edge rudder pieces structural representation (being applicable to design conditions):
(a) rotation blade and rudder sheet;
(b) the coupled condition schematic representation of rudder sheet and blade inlet edge;
(c) be the side cutaway view of (b);
(d) rudder chip architecture size;
Fig. 2: rotation blade and front edge rudder pieces structural representation (being applicable to off-design behaviour);
Fig. 3: the state of a control schematic representation of rudder sheet in asymmetric flowing such as blade driftage;
Fig. 4: rudder plate shape example:
(a) rudder sheet surface configuration (A-A view among Fig. 2 (b));
(b) sectional shape;
Fig. 5: control flow chart.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.It should be noted that the purpose of publicizing and implementing example is to help further to understand the present invention, but it will be appreciated by those skilled in the art that: in the spirit and scope that do not break away from the present invention and claims, various substitutions and modifications all are possible.Therefore, the present invention should not be limited to the disclosed content of embodiment, and the scope of protection of present invention is as the criterion with the scope that claims define.
The overall structure of the case study on implementation of this patent as depicted in figs. 1 and 2.
Fig. 1 is the control rudder chip architecture schematic representation of wind-driven generator rotation blade and this patent design.Among Fig. 1 (a): structure 1 expression rotation blade upper surface (suction surface); Structure 2 expression blade inlet edges; Structure 3 expression trailing edges; Structure 4 expression roots of blade, it is the junction surface of blade and fan shaft; Structure 5 expression blade tips (being blade tip); Structure 6 is control rudder sheets of this patent design, and this patent has been arranged a series of control rudder sheets along exhibition to (promptly pointing to blade tip 5 from blade root 4) at blade inlet edge 2.With respect to blade, the rudder chip architecture of this patent design is small-sized, and the suffered aerodynamic force of rudder sheet itself is also less relatively.Therefore, the manufactured materials of rudder sheet can adopt glass fibre/carbon fiber composite, reinforced aluminum, steel or other metal materials etc.
Among Fig. 1 (a), U represents the wind field wind speed, L represents span of foil (promptly from blade root 4 or fan shaft axle center to the radial distance between the blade tip 5), and c represents blade maximum chord length (i.e. the distance between 3 from blade inlet edge 2 to trailing edge), and l represents the spacing of adjacent rudder sheet.Excessive or too small rudder sheet spacing all should be avoided.In this patent, rudder sheet spacing is got l=(1/8～1/2) c.For rotation blade, need in opening up long scope entirely, blade all not install the rudder sheet additional.Result of study shows that when the long blade inner segment of blade root 4 to 50% exhibitions installed the rudder sheet additional, it controlled DeGrain.Therefore, among Fig. 1 (a), the rudder sheet mainly be installed in exhibition to the position greater than the blade of 50%L outside the section.
Fig. 1 (b) has described the relative position (partial enlarged drawing) between the single rudder sheet and blade when design conditions (rated wind speed condition).Among Fig. 1 (b): structure 7 expression rotation blade leading edges are cracked; Structure 8 connecting rod for indication spares, it directly passes blade inlet edge and cracks 7, and rudder sheet and the control mechanism 10 that is installed in the blade interior cavity are coupled together; The base that is used for fixing control mechanism 10 in 9 expressions of structure blade cavity; Structure 11 expression rotation blade lower surfaces.
Fig. 1 (c) is the side view of Fig. 1 (b).Wherein δ represents the assemblage gap between rudder sheet and the rotation blade leading edge.Fig. 1 (d) has then provided the physical dimension of rudder sheet self.Wherein, a, b, t represent the length (thickness) of rudder sheet respectively.In addition, utilize the shape angle Λ (being the sweepback angle of rudder sheet leading edge) of rudder sheet to describe the rudder plate shape.Obviously, meeting geometric relation between a, b and the Λ: b=2a * cot Λ.Like this, the size of rudder sheet will depend primarily on length a.In this patent, get a=(0.05～0.3) l, wherein l is the spacing of adjacent rudder sheet, shown in Fig. 1 (a).Rudder plate shape angle (sweepback angle) Λ is the important parameter of influence control effect.In this patent, get Λ=30 °～80 °.Rudder sheet thickness t also has certain influence to the control effect.In this patent, should choose relative thickness less than 10% flake structure, i.e. t/a≤10%.In addition, for fear of the adverse effect that the Clearance Flow between rudder sheet and the blade inlet edge may cause the control effect, can be in the reasonable scope with assemblage gap δ control.In this patent, get δ＜0.2a.
Fig. 1 (b) shows that rudder sheet 6 can carry out rolling movement around self symmetry axis in control procedure, remember that its roll attitude angle is φ, and the roll attitude angle φ of state of a control shown in note Fig. 1 (b)=0 °.Then in control procedure, the scope that the rudder sheet carries out rolling movement is φ=0 °～180 °.Among Fig. 1 (b), the rudder sheet is parallel with streaming of blade inlet edge, and the rudder sheet will be immersed in adhering in the stream of blade inlet edge fully, also is that flowing of rudder sheet surface also will be finished to be in and adhere to stream mode.Like this, the rudder sheet shown in Fig. 1 (b) will be not can be to the adhering to flow and produce any negative influence of rotation blade surface thereafter, guarantee blade under declared working condition with best generating efficiency operation.Therefore, the rudder sheet state shown in Fig. 1 (b) is applicable to the rotation blade that moves under declared working condition.
For wind-driven generator, because the wind field climatic conditions change, fan blade operates under the big wind speed off-design behaviour many times all having to.As previously mentioned, under big wind speed off-design behaviour condition, rotation blade all is in stall conditions usually, and the nearly wall of blade upper surface 1 flows and shows as boundary layer separation on a large scale, forms bigger flow separation zone.In the separation zone, flow and slow down and disorder, cause blade upper surface 1 place pressure to raise (with respect to adhering to stream mode), reduce blade pneumatic efficiency (pressure difference between blade lower surface 8 and the upper surface 1 is the main source of parameter of aerodynamic characteristics such as blade lift).
With 90 ° of rudder sheet 6 lift-over of blade inlet edge (be φ=90 °), shown in Fig. 2 (a-b), utilize rudder sheet 6 and rotation blade leading edge to stream the strong vortex that interaction produces and flow, can effectively improve the aeroperformance of rotation blade under big wind speed off-design behaviour condition.When rudder sheet 6 was in state of a control shown in Fig. 2 (b), the relative angle of attack (angle) that blade inlet edge streams between the rudder sheet 6 with triangle wing was bigger, and air-flow will form strong vortex (flowing to vortex structure) after through rudder sheet 6.These flow to the mobile momentum of nearly wall that vortex structure will significantly strengthen blade upper surface 1, strengthen the ability of its opposing adverse pressure gradient and flow separation, dwindle the separation zone of blade upper surface, effectively improve the aeroperformance of blade, make wind-driven generator under big wind speed off-design behaviour, keep more stable output power.
For blade is carried out meticulous control in the output power of off-design behaviour, this patent is further given rudder sheet 6 with pitching movement degrees of freedom Δ α, shown in Fig. 2 (c).In this patent, the scope that the rudder sheet carries out pitching movement is Δ α=-60 °～30 °, in the process of the concrete blade of design, also can suitably expand this span according to actual conditions.Δ α＜0, expression rudder sheet rotates, and shown in Fig. 2 (c), the air-flow angle of attack of rudder sheet reduces relatively; Otherwise, Δ α＞0, the rudder sheet upwards rotates, and the angle of attack increases.
Pitch attitude angle by adjusting rudder sheet 6 is (shown in Fig. 2 (c), rudder sheet 6 turns to 6 ', vice versa), can adjust the power that flows to vortex structure that the rudder sheet is produced, thereby change its intensity, finally reduce the pulsation amplitude of wind-driven generator output power as far as possible the effect of blade upper surface separation zone.
When operating in the asymmetric air-flow such as driftage when wind-driven generator, the exhibition of blade surface is to flowing and the local angle of attack of each cross section of blade presents cyclically-varying with the blade rotation, thereby causes vane stress also to show identical cyclophysis with output power.Current commercial wind-driven generator all can only pass through unitary rotation wind wheel (to wind), makes blower fan be in righteous style and practice again but not the driftage state.But, all be very slowly usually therefore to the wind process because commercial wind-driven generator all has huge physical dimension and weight.In this patent, can be by adjusting the roll attitude angle φ of rudder sheet in real time, as shown in Figure 3, utilize guide functions and the strong vortex of rudder sheet under the sideslip state to flow to weaken even eliminate the asymmetric of blade upper surface and flow, keep the stable of vane stress and output power.
In the present embodiment, get the long L=5m of blade, blade root chord length c=0.8m, adjacent rudder sheet spacing l=0.3c, rudder length of a film a=0.25l, rudder plate shape angle Λ=65 ° (wide b=2a * cot Λ), rudder sheet thickness t=0.1a, the assemblage gap of rudder sheet and blade inlet edge are δ=0.15a.The rudder sheet adopts the manufacturing of glass fibre reinforced plastics material.For the simplified structure design, present embodiment is not made polishing, smooth treatment to the rudder sheet, and rudder sheet sectional shape directly adopts the rectangle among Fig. 4 (b).
In the present embodiment, the wind speed range of the normal operation of wind-driven generator is 10m/s-20m/s, and wherein 10m/s is the rated wind speed of fan blade, and blade rotational speed is 1.2 revolutions per seconds.For the control effect is analyzed, present embodiment was divided into for two steps: at first, the blower fan output power that does not add the rudder sheet is tested; Then, install the rudder sheet by structural design scheme illustrated in figures 1 and 2 additional in the fan blade leading edge, testing the rudder sheet again (is the control effect of wind velocity U＞10m/s) under big wind speed off-design behaviour.Test result is as follows.
When (1) not adding the rudder sheet, the blower fan output power is 13% in the fluctuation amplitude of 10m/s-20m/s wind speed range.Wherein, during the 15m/s wind speed, the blade output power is during than rated wind speed low 13%; During the 20m/s wind speed, the blade output power is during than rated wind speed low 10%.
(2) after the employing rudder sheet controlling schemes, the fluctuation amplitude of blower fan output power reduces to 2%.Concrete control procedure is as follows: during rated wind speed (U=10m/s), rudder sheet roll attitude angle φ=0 °, pitch attitude angle Δ α=0 ° promptly keeps state shown in Figure 1, blower fan output power consistent when not adding the rudder sheet (also this moment, the rudder sheet can be ignored the side effect of rotation blade aerodynamic characteristic); When wind speed increases to 15m/s, rudder sheet roll attitude angle φ=90 °, pitch attitude angle Δ α=-15 °, the blade output power improves 11% than the output power that does not add when control, thereby makes the fluctuation amplitude of output power reduce to 2%; When wind speed increases to 20m/s, rudder sheet roll attitude angle φ=90 °, pitch attitude angle Δ α=-5 °, the blade output power after the control increases 1.2% (amplitude fluctuates) during than rated wind speed, and the output power when not adding control improves 9%.
In the structural representation of Fig. 1-shown in Figure 3, the rudder sheet mainly adopts the delta wing shape, and rudder sheet sectional shape adopts two arcs.Fig. 4 gives other several rudder plate shapes that are applicable to this patent, and as trapezoidal, arc etc., rhombus, rectangle, trapezoidal etc. then can be adopted in rudder sheet cross section.When actual design rudder chip architecture, can Fig. 4 be the basis also, suitably correct.
Claims (9)
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| CN2010102152424A CN101865081B (en) | 2010-07-01 | 2010-07-01 | A device and method for adjusting the output power of a rotating blade by using a leading edge rudder blade |
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| CN2010102152424A CN101865081B (en) | 2010-07-01 | 2010-07-01 | A device and method for adjusting the output power of a rotating blade by using a leading edge rudder blade |
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| CN102606417A (en) * | 2012-03-19 | 2012-07-25 | 西安交通大学 | Blade structure of wind power generator with serrated blade apexes |
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| CN105518292A (en) * | 2013-07-30 | 2016-04-20 | 荷兰能源研究中心基金会 | Rotor blade for a wind turbine, and wind turbine field |
| CN105756866A (en) * | 2016-02-22 | 2016-07-13 | 上海理工大学 | Vortex generating device |
| GB2588258A (en) * | 2020-03-26 | 2021-04-21 | Lm Wind Power As | Wind turbine blade with a flow controlling element |
| WO2021089019A1 (en) * | 2019-11-07 | 2021-05-14 | 中材科技风电叶片股份有限公司 | Apparatus and method for regulating airfoil aerodynamic performance of blade, vortex generator control system, unit control system of wind turbine, vortex generator, and blade |
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| CN102606417A (en) * | 2012-03-19 | 2012-07-25 | 西安交通大学 | Blade structure of wind power generator with serrated blade apexes |
| CN105518292A (en) * | 2013-07-30 | 2016-04-20 | 荷兰能源研究中心基金会 | Rotor blade for a wind turbine, and wind turbine field |
| CN105518292B (en) * | 2013-07-30 | 2018-12-14 | 荷兰能源研究中心基金会 | Rotor blade and wind turbine airport for wind turbine |
| CN104728038A (en) * | 2015-01-20 | 2015-06-24 | 河海大学 | Self-adjustment enhanced vortex generating device for horizontal-axis wind turbine |
| CN105756866A (en) * | 2016-02-22 | 2016-07-13 | 上海理工大学 | Vortex generating device |
| CN105756866B (en) * | 2016-02-22 | 2018-04-20 | 上海理工大学 | Vortex generating means |
| US11926383B2 (en) | 2018-03-15 | 2024-03-12 | Beijing Qisheng Science And Technology Co., Ltd. | Systems and methods for controlling an object |
| CN113641121A (en) * | 2018-03-15 | 2021-11-12 | 北京骑胜科技有限公司 | Method and system for controlling bicycle based on pressure detection |
| CN113167226A (en) * | 2018-12-13 | 2021-07-23 | 西门子歌美飒可再生能源公司 | Method and controller for full power control of wind turbines |
| US12018652B2 (en) | 2018-12-13 | 2024-06-25 | Siemens Gamesa Renewable Energy A/S | Method and controller for full-power control of a wind turbine |
| WO2021089019A1 (en) * | 2019-11-07 | 2021-05-14 | 中材科技风电叶片股份有限公司 | Apparatus and method for regulating airfoil aerodynamic performance of blade, vortex generator control system, unit control system of wind turbine, vortex generator, and blade |
| CN113090442A (en) * | 2019-12-23 | 2021-07-09 | 江苏金风科技有限公司 | Adjustable wing blade, control method and control device thereof and wind generating set |
| GB2588258A (en) * | 2020-03-26 | 2021-04-21 | Lm Wind Power As | Wind turbine blade with a flow controlling element |
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