Wind turbine power output is influenced by environmental conditions, including rain. Therefore, a better understanding of the effect of rain on the performance of wind turbines is necessary. Our coupled Lagrangian-Eulerian multiphase computational fluid dynamics model was modified to more accurately simulate the momentum transfer during water film formation on the airfoils of a horizontal-axis turbine and the performance loss caused by the rainwater film on the National Renewable Energy Laboratory (NREL) turbine performance. To obtain three-dimensional numerical simulation of the wind turbine in manageable computational time, simplifying assumptions were made and the validity of these assumptions was verified by simulating the flow over the S809 airfoil of the NREL turbine. In a dry environment, simulation of turbine power output agreed well with NREL experimental data. Our multiphase model showed that the rain film accumulation and flow on the surface of the turbine airfoil reduces the power output of the turbine. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

---

降雨对水平风力涡轮机性能的影响的CFD模拟

风力涡轮机的功率输出受包括雨水在内的环境条件的影响。因此，有必要更好地了解雨水对风力涡轮机性能的影响。我们对耦合的拉格朗日-欧拉多相计算流体动力学模型进行了修改，以更准确地模拟水平轴涡轮机翼型上的水膜形成过程中的动量传递以及国家可再生能源实验室（NREL）的雨水膜造成的性能损失涡轮性能。为了在可控制的计算时间内获得风力涡轮机的三维数值模拟，我们进行了简化的假设，并通过模拟NREL涡轮机的S809翼型上的流动，验证了这些假设的有效性。在干燥的环境中 涡轮功率输出的仿真与NREL实验数据吻合得很好。我们的多相模型表明，雨膜在涡轮机翼型表面上的积累和流动降低了涡轮机的功率输出。©2017美国化学工程师学会AIChE的Ĵ，2017年