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基于双方程k-ω SST模型提出两种改进湍流模型,采用丹麦科技大学的自编求解器EllipSys3D结合致动盘方法,对单台风力机尾流流场进行数值模拟。该文将SST-sust模型引入到风力机尾流的数值研究中,为了更进一步增大预测到的湍流强度和提高尾流恢复速度,提出SST-Csust模型和SST-Dsust模型,它们是在SST-sust模型的基础上分别调整湍流模型的封闭常系数、修正ω方程的耗散项。通过与理论、实验以及LES模型进行对比分析,结果表明该文提出的改进模型在尾流区速度分布和湍流强度分布的预测方面可取得较好的应用效果。
Two improved turbulence models are proposed based on the two-equation k-ω SST model. EllipSys3D combined with actuator disk method is used to simulate the wake flow field of a single wind turbine. In this paper, the SST-sust model is introduced into the numerical study of wind turbine wake. In order to further increase the predicted turbulence intensity and improve wake recovery rate, SST-Csust model and SST-Dust model are proposed, -sust model based on the regulation of the closed-loop turbulence model of constant coefficients, correction ω equation of the dissipative term. By comparing with theoretical, experimental and LES models, the results show that the improved model proposed in this paper can be applied in prediction of wake velocity distribution and turbulence intensity distribution.