风力机标模非定常数值模拟中的影响因素研究

基于自主研发的“亚跨超 CFD 软件平台”(TRIP3.0)，采用刚性运动网格技术和动态拼接网格技术，开发了针对旋转类机械的非定常求解模块。本文开展了 NREL Phase VI 风力机标模非定常数值模拟中的影响因素研究，影响因素主要包括不同时间步长的影响、不同湍流模型的影响、刚性动网格技术和动态拼接网格技术的影响三个方面。本文数值模拟采用的控制方程为雷诺平均 N-S 方程，采用有限体积法离散控制方程，离散方程的时间方向采用“双时间步”方法求解，空间方向无粘项离散采用 MUSCL-Roe 格式，湍流模型采用 SA 和 SST 湍流模型，并引入多重网格和并行计算技术加速求解。数值模拟结果表明：时间步长、湍流模型、网格方案等因素主要影响风力机叶片吸力面的流动结构，进而影响吸力面的压力分布，而对压力面的流动结构和压力分布基本没有影响；采用刚性运动网格结合 SA 湍流模型所得到的压力分布更接近实验值。

Numerical investigation of different parameters on the unsteady aerodynamic characteristics of the standard wind turbine model

The unsteady calculation modules based on the “TRIsonic Platform”(TRIP 3.0) are developed and applied to the standard wind turbine models with dynamic patched-grid and crossed-grid techniques.The influences of different parameters on the aerodynamic characteristics of the NREL Phase VI wind turbine model are analyzed,which includes different real time steps, turbulence models and grid methods on calculating the unsteady RANS equation.The SA/SST turbulence models,dual-time method,MUSCL-Roe scheme,multi-grid and massively parallel computation technique are adopted for the unsteady simulations.The numerical results show that the different real time steps,turbulence models and grid methods mainly affect the flow structure on the suction surface,further on the pressure distribution on the suction surface.The numerical results of the dynamic patched-grid technique combined with SA turbulence model are in good agreement with the experimental data.