Local energy accumulation ring of wind wheel of wind turbine and design method thereof
A technology of energy-gathering rings and wind turbines, which is applied to wind engines, wind engines consistent with the wind direction, and wind power generation. The effect of improving work efficiency
Inactive Publication Date: 2011-06-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0002] At present, the wind turbine blades of kilowatt-level and above wind turbines are basically installed directly on the hub, which not only has low strength of the blades, but also is not conducive to the capture of wind energy, resulting in a high start-up wind speed of the wind turbine and a decrease in the working efficiency of the wind turbine.
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[0011] The present invention provides a design method for a local energy-collecting ring of a wind turbine rotor. The present invention will be further described below through the description of the drawings and specific implementation methods.
[0012] figure 1 is the position and structure diagram of the local energy gathering ring; figure 2 It is a schematic diagram of the structure of A-A surface. The shape of the local energy-gathering ring 2 is circular, and its cross-sectional shape from the windward direction is: an isosceles triangle, the angle of the top angle is γ=30°, and the bottom side is l; the width domain of the blade is a rectangle, and the size is l×B ; then it is a long ellipse with a semi-major axis of , the semi-minor axis is ; Among them, l is the width of the local energy-collecting ring in the radial direction, and B is the axial width of the wind rotor blade. According to Bezier's theory, the maximum wind energy captured by the wind rotor is: ...
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The invention belongs to the technical field of wind power generation, in particular to a design method of a local energy accumulation ring of a wind wheel of a wind turbine. The local energy accumulation ring is arranged on the wind wheel, wherein, the local energy accumulation ring is positioned and fixed by blades of the wind wheel and centrosymmetrically arranged by taking an axis of rotationof the wind wheel as a center, the shape of the local energy accumulation ring is circular, and the shape of a cross section thereof is a combination of an isosceles triangle, a rectangle of a width region of the blades and a long oval after that, which are sequentially arranged in the windward direction. The radius of the local energy accumulation ring is adjusted to be r, and the width of the local energy accumulation ring in the radius direction is adjusted to be l, thereby obtaining different wind energy utilization improvement coefficients of epsilon. A wind turbine unit with the same diameter of the wind wheel can improve the utilization rate of wind energy by 2%-5%, reduce the start-up wind speed by about 3%-6% and effectively improve the working efficiency of the wind turbine calculated by taking the diameters of 80m and 90m of the wind wheel as examples by adopting the local energy accumulation ring of the wind wheel of the wind turbine.
Description
technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a design method of a local energy gathering ring of a wind wheel of a wind turbine. Background technique [0002] At present, the wind turbine blades of kilowatt-level and above wind turbines are basically directly installed on the hub, which not only has low strength of the blades, but also is not conducive to the capture of wind energy, resulting in a high start-up wind speed of the wind turbine and a decrease in the working efficiency of the wind turbine. Contents of the invention [0003] The invention provides a local energy-gathering ring of a wind turbine rotor, characterized in that the local energy-gathering ring of the wind turbine rotor is installed on the wind rotor, wherein the local energy-gathering ring is formed by the wind The positioning of the rotor blades is fixed, and they are symmetrically arranged around the rotation axis of the ...
Claims
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IPC IPC(8): F03D1/06
CPCY02E10/72Y02E10/721
Inventor 张照煌
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)