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在风剪切来流风况下,对WindPACT 1.5MW风力机近尾迹流动特性进行了数值计算,同时研究了三种风剪切系数(0.1、0.2和0.3)对风力机近尾迹流动特性的影响。基于雷诺平均不可压N-S方程的计算流体力学方法数值模拟三维非定常的风力机流场,其中,湍流模型选取Shear Stress Transport k-ω湍流模型。研究结果表明:在近尾迹区域,来流空气的轴向诱导因子和切向诱导因子受到旋转叶片的强烈影响,并在风力机下游形成明显的轴向速度亏损。这种轴向速度亏损随空气向下游流动过程中,逐渐减弱。轴向诱导因子和切向诱导因子受风剪切影响,呈非周期性分布,并且风剪切系数增加,这种影响随之增强。
Under the condition of wind shear flow, the near wake flow characteristics of WindPACT 1.5MW wind turbine are numerically calculated and the influence of three wind shear coefficients (0.1, 0.2 and 0.3) on the near wake flow characteristics of wind turbine is studied. Based on the Reynolds-average incompressible N-S equation, the computational fluid dynamics (CFD) method is used to numerically simulate the three-dimensional unsteady wind turbine flow field. The turbulence model is Shear Stress Transport k-ω turbulence model. The results show that axial inducing factor and tangential inducing factor of incoming air are strongly affected by rotating blades in the near wake region, and a significant axial velocity loss is formed downstream of the wind turbine. This loss of axial velocity decreases with air flow downstream. Axial and tangential factors are influenced by wind shear, and are non-periodic, and the wind shear coefficient increases. This effect is enhanced.