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中文摘要：
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to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。
英文摘要：
The flow field of a wind turbine wake was numerically simulated based on two improved turbulence models proposed by double equation k-ω SST model, and using EllipSys3D self-made solver with the actuator disc （AD）method. The SST-sust model was introduced into the numerical research of wind turbine wake, and in order to increase further forecasted turbulence intensity and raise wake recovery rate, SST-Csust model SST-Dsust model were proposed. Based on the SST-sust model, they adjust the closed constant coefficient of the turbulence model, modify the dissipation item of the to equation, respectively. The comparisons and analyses between theory, experiment and LES model were carried out, the results show that the improved models indeed obtain better application effect in predicting speed distribution and turbulence intensity distribution in the wake flow region. It is expected that the improved models are able to be used for wind energy assessment of larger wind farm in the near future.
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