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本文采用CFD数值模拟方法研究了H型垂直轴风力机基于动态变桨条件下的二维非定常黏性绕流场。以一个三叶片H型风力机的实验模型为研究对象,采用笛卡尔动网格方法,选用SST湍流模型。叶尖速比分别为2.15和2.27,将动态变桨条件下模拟得到的风力机的功率系数与常规无变桨条件下的模拟结果进行了比较。讨论了单个叶片和风轮总载荷沿周向的变化规律,详细分析了一个旋转周期内二维非定常涡量场的变化,揭示了动态变桨后风力机气动载荷提高的原因。
In this paper, the CFD numerical simulation method is used to study the two-dimensional unsteady viscous flow around a H-axis wind turbine under dynamic pitch conditions. A three-blade H-type wind turbine experimental model for the study, the use of Cartesian moving grid method, the selection of SST turbulence model. The tip speed ratios are 2.15 and 2.27, respectively. The power factor of the wind turbine simulated under dynamic pitch is compared with that under conventional non-pitch conditions. The variation regularity of the total load of single blade and wind wheel in the circumferential direction was discussed. The variation of two-dimensional unsteady vorticity field in one rotation cycle was analyzed in detail. The reason of the aerodynamic load increase of wind turbine after dynamic pitch was revealed.