基于涡尾迹方法的风力机非定常气动特性计算

WIND TURBINE UNSTEADY AERODYNAMIC PERFORMANCE PREDICTION BASED ON THE VORTEX WAKE METHOD

给出了一种水平轴风力机三维非定常气动特性计算方法。风力机的绕流用预定涡尾迹模型确定,并引入涡核模型和考虑粘性引起的耗散效应对模型进行修正,解决了涡尾迹方法在大叶尖速比时普遍存在的计算发散问题。通过对Leishman-Beddoes动态失速模型中动态失速判据和模拟的修正,更准确计算侧偏风时风轮叶片的非定常气动响应。将三维旋转失速延迟模型与预定涡尾迹模型和动态失速模型适当耦合,从而计算包括三维旋转效应对叶片气动载荷非定常响应的影响,提高了风力机风轮和叶片非定常气动特性计算的准确度。

A three-dimensional unsteady aerodynamic model for horizontal axis wind turbine performance prediction was presented. The flowfield around the turbine was calculated using the prescribed wake model. In particular, a vortex core model and a vorticity dissipation model were introduced to cope with the divergence generally existing in vortex wake methods. The Leishman-Beddoes dynamic stall model was modified and then used to provide the unsteady characteristics of the blade due to the yaw wind. A modified three-dimensional stall delay model was coupled with the method to calcu- late the unsteady aerodynamic response of the blade due to the rotational effect. The calculated results demonstrate that the wind turbine unsteady aerodynamic performance prediction is improved using the modified approach.