【摘要】 针对现有致动盘模型高估尾流速度的问题,对动量源项进行修正,以正确反映风轮对来流的作用;对湍流模型进行修正,在标准k-ε方程中添加湍流动能源项和耗散率源项,使湍流动能的生成和耗散相互协调;修正耗散率源项系数,使其沿径向服从抛物线分布。选取风洞实验数据对模型进行验证,并对串列和错列排布下的尾流流场进行分析。结果表明:串列排布时尾流的速度损失和湍流强度均增加,并随间距的增大而减小;错列排布对尾流湍流强度的影响大于对速度的影响,下游尾流会出现湍流强度不对称现象,横向间距为1D时最为严重,横向间距为4D时仍可观察到不对称现象。更多还原

【Abstract】 To solve the problem of overestimation of wake velocity in the actuator disc model,the source term in momentum equation was modified to accurately reflect the effect of wind turbine rotor on the incoming flow.The turbulence model was corrected by adding new source terms to the turbulence kinetic energy equation and the turbulence dissipation rate equation in the standard k-εturbulence model,to make the formation and dissipation of turbulent kinetic energy coordinated with each other.The parameter C4εin the dissipation rate equation was corrected from a constant to a certain distribution along radial direction.The wind tunnel experimental data were chosen to verify the simulation results and the wake flow field was analyzed under different arrangement conditions.Results show that under tandem arrangement,both the velocity loss and the turbulence intensity in the wake increase,which reduce with rising spacing.The influence of staggered arrangement on the turbulence intensity is greater than that on the velocity.Under staggered arrangement,an asymmetric profile of turbulence intensity occurs in the wake;the maximum deviation occurs in the case of 1Dspacing,and the asymmetric phenomenon can still be observed even the spacing gets up to 4D.更多还原