Blade, blade wheel and method of determining optimal value of outflow tangent inclination of windward side
A method for determining the windward side, which is applied in the field of determining the optimal value of the inclination angle of the tangent line of the outflow, can solve the problems of high wind speed at the start of the wind turbine rotor, low wind energy utilization coefficient, and low wind energy utilization rate, so as to improve the utilization of wind energy Efficiency, improving the ability to convert energy into blade rotation, and improving the ability of wind power generation blades to convert the energy of flowing air into blade rotation energy
Active Publication Date: 2017-06-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0005] At present, the research on the active action of air flow (wind) on the blades to make the wind rotor rotate is still in the exploratory stage. Compared with Europe and the United States, the quality of China's wind resources is relatively poor, and the annual average wind speed in most areas is low. The wind turbines imported from abroad are widely installed in the field, and there are problems such as high start-up wind speed of wind turbines, high rated operating wind speed, and low wind energy utilization rate, which makes the wind energy utilization coefficient of these imported wind turbines in China lower than the design value. The phenomenon that the annual power generation is lower than the foreign test level
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[0036] see Figure 1 to Figure 4 As shown, the embodiment of the present invention provides a blade, including a windward surface 201 and a leeward surface 202; the outflow tangent angle α of the windward surface 2 is 0°, where the inclination angle α of the outflow tangent line on the windward side 2 is the initial absolute velocity of air flowing out of the blade The direction of the air flow out of the blade and the initial implicated motion velocity The angle between the opposite directions of . Outflow tangent inclination angle α on the windward side 2 is 0°, that is, the outflow tangent on the windward side is parallel to the initial entrainment velocity of the air flowing out of the blade direction. By changing the shape of the curve of the windward side to change the inclination angle of the outflow tangent line on the windward side, and make the inclination value zero degrees, the aerodynamic force has been fully exerted, thereby improving the energy of the wi...
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The invention relates to the technical field of wind power generation, in particular to a blade, a blade wheel and a method of determining optimal value of outflow tangent inclination of a windward side; the blade comprises a windward side and a leeward side; outflow tangent inclination Alpha2 of the windward side is 0 DEG, wherein the outflow tangent inclination Alpha2 of the windward side is an included angle between a direction of initial absolute motion velocity, shown in the description, of air flowing out the blade and an opposite direction of initial transport motion velocity, shown in the description of the air flowing out the blade. The outflow tangent inclination of the windward side is changed and is set to zero DEG so that aerodynamic force is given to full play, the ability of the wind generating blade to convert energy of flowing air into rotational energy of the blade is improved, and wind power utilization rate is increased, that is to say, wind power conversion rate of the wind generating blade is maximized.
Description
technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for determining the optimal value of the outflow tangent inclination angle of a blade, a wind wheel and a windward surface. Background technique [0002] The working principle of the wind turbine is to convert wind energy into mechanical energy through the blades, and then transfer the mechanical energy to the wind turbine through connecting devices such as hubs, shafts and gearboxes, and finally the generator converts the mechanical energy into electrical energy and transmits it to the grid for use by users. Blades are one of the core components of wind turbines. [0003] At present, wind power blades are mostly developed from the aircraft airfoil. The design process of the unit blade is to stack the airfoil along the blade span according to a certain twist angle, chord length and thickness distribution. Therefore, the aerodynamic performance of the airfoi...
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Patent Timeline
Login to View More IPC IPC(8): F03D1/06
CPCF03D1/0633Y02E10/72
Inventor 张照煌宋玉旺王磊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)