A 3-D dynamic stall model based on a low aspect ratio rectangular wing is modified for the ro-tating wind turbine blade with high aspect ratio. Only one tip vortex is trailed and is appropriately cou-pled with the blade element theory and 3-D rotational effect model for the calculation of both the wind turbine gross performance and 3-D unsteady aerodynamic airloads in different flow environments. The comparison between the calculated results and the experimental data demonstrates that the wind turbine unsteady aerodynamic performance prediction is improved when the 3-D dynamic stall model is included. For completeness, both the scheme and the calculated results are discussed. It is demonstrated that the 3-D dynamic stall characteristic of the wind turbine blade is simulated better by the propose model than by other models.%为了适应风力机叶片的大展弦比、旋转和只有单侧叶尖涡的特点,对已建立的适用于小展弦比直机翼的三维动态失速模型进行了一系列的修正,然后用于风力机三维非定常气动特性计算.该动态失速模型所必须的气动输入参数将由动量叶素理论方法计算得到.本文将动量叶素理论、三维动态失速模型、三维旋转效应模型适当耦合起来,获得了风力机叶片的三维非定常气动特性计算方法.应用上述方法计算得到了不同工况下的风力机叶片各截面的非定常气动载荷结果,并与风洞实验结果以及用二维动态失速模型计算的结果进行比较,对计算方法和计算结果进行了详细的分析和讨论.本文模型相比于二维模型,能够更好地仿真风力机叶片的三维动态失速气动特性,尤其在叶片外部截面效果更佳.
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