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致动模型是一种较新的CFD计算模型,通过在N-S方程添加源项的形式模拟叶片对流场的作用,减少了网格数量和计算时间。在OpenFoam平台上对比了两种风力机尾流预测模型,包括PISO求解的致动线模型和多重参考稳态求解的CFD实体模型。进而数值研究了NREL 5 MW风力机在均匀来流中的近尾流区流场特性,结合大涡模型和致动线模型,通过对不同风速下尾流的流场特性分析,包括涡结构、尾流速度亏损、拟涡能等,验证了致动线模型的准确性,为近场尾流研究提供有利参考。
Actuation model is a newer CFD calculation model. By adding the source term to the N-S equation to simulate the action of the blade on the flow field, the number of grids and the calculation time are reduced. Two wind turbine wake prediction models are compared on the OpenFoam platform, including the PISO-solved actuation line model and the multiple reference CFD solid model. Furthermore, the flow field characteristics of NREL 5 MW wind turbine near the wake were studied numerically. Combining the large eddy model and the actuation line model, the flow field characteristics of the wake at different wind speeds were analyzed, including the vortex structure, Wake velocity loss and quasi-vortex energy. The accuracy of the model is verified, which provides a good reference for the near wake wake research.