风电场复杂尾流场的快速仿真模拟

Fast Simulations of Complex Wake Flows around Wind Farm

该文基于自主开发的风电场尾流快速模拟软件WinFm-SJTU,结合Park尾流模型和能量守恒叠加模型,对风电场尾流流动进行了模拟仿真。结果表明,与CFD数值模拟结果相比,WinFm-SJTU能较好预测串列三风机的功率总和以及首台和第二台风机的功率,但对于较小流向间距下的第三台风机功率预报误差较大。为此,考虑到尾流叠加区域内更高的湍流强度引起的速度恢复更快,并基于改进后的能量守恒尾流叠加模型,对包含35台风机的大型风电场进行了仿真模拟,结果表明,WinFm-SJTU能够较好预测不同列向风机中各台风机的尾流损失及功率,风电场总功率误差仅1.02%。以上计算结果表明,WinFm-SJTU软件能够快速准确地模拟风电场尾流流动。

The simulations of wind farm wake flow are performed based on self-developed software WinFm-SJTU.The Park wake model and energy conservation superposition model are used.Compared to results simulated by CFD method,power of three tandem wind turbines,as well as power of first and second wind turbines is well predicted by WinFm-SJTU,whereas power of third turbine under smaller spacing shows a discrepancy.Therefore,for simulation of wind farm with 35 wind turbines,the energy conservation superposition model is modified to account for faster velocity recovery induced by stronger turbulence intensity in wake superposition region.The wake loss of each wind turbine in a column predicted by WinFm-SJTU,as well as power of various columns in windfarm show a good agreement with those of CFD method,and the difference of total power of wind farm is only 1.02%.It is demonstrated that WinFm-SJTU can quickly and accurately predict the wake flow in wind farm.