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以美国可再生能源试验室公开的5 MW风力机(NREL-5MW)为原型,试验模型几何缩尺比为1∶50,使用动量叶素理论(BEM理论)计算叶片风轮推力。为改善模型试验叶片的尺度效应,变化模型叶切面的翼型和分布,对风轮推力进行计算和分析。以此为基础,选取叶切面的弦长和转角作为优化变量,以风轮推力为优化目标,建立优化数学模型,使用模矢搜索法和罚函数法求解,得到能较准确模拟风轮推力的试验用叶片。
The 5MW wind turbine (NREL-5MW) disclosed by the United States Renewable Energy Laboratory was used as a prototype. The geometry scale ratio of the experimental model was 1:50. The rotor thrust of the blade was calculated using the momentum valence element theory (BEM theory). In order to improve the scale effect of model test blades, the aerofoil thrust force was calculated and analyzed by changing the airfoil shape and distribution of blade surface. Based on this, the chord length and rotation angle of blade surface are selected as optimization variables, and the propeller thrust is taken as the optimization objective. An optimized mathematical model is established and mode-search method and penalty function method are used to solve the problem. Test leaves.