瞬变工况风力机气动性能预测

摘要：
用非线性非定常涡格法计算了风力机在瞬态的非定常性能.该方法由于风力机尾迹未知，故采用时间步进历程确定.以NREL Phase VI 风力机作为 模型，进一步计算了该风力机在瞬态变桨距角时尾迹、功率输出、载荷等变化历程，并与实验值进行对比.结果表明，该模型可以较好地反映尾迹 对叶片的诱导速度变化，载荷的快速变化以及变化至稳态结果的过程. 关键词：
风力机； 动态入流； 气动性能 中图分类号： TK 83
文献标志码： A

Aerodynamic Investigation of Wind Turbine During Pitching Motion

A vortex lattice method was used for the blade model for the unsteady aerodynamic prediction of wind turbine during pitching motion. In order to present the change of the shape and vorticity of the wake, a time marching free wake model was used to calculate the wake trailed for the tip of the blade. The results of the test cases were compared with the experimental data available from the NREL PHASE VI rotor experiments, indicating that the model not only corrects power levels, but also predates the transient overshoots and undershoots of the rotor during pitching motion accurately.