风剪切来流对风力机近尾迹流动特性影响

THE EFFECTS OF WIND SHEAR ON THE NEAR WAKECHARACTERISTICS OF AWIND TURBINE BLADE

中文关键词: 近尾迹  速度亏损  风剪切  诱导因子

英文关键词: near wake  velocity deficit  wind shear  interference factor

中文摘要:

      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。

英文摘要:

      The effects of wind shear and wind shear coefficients on the near wake of WindPACT 1.5 MW wind turbine were investigated. Wind shear coefficients were equal to 0.1, 0.2 and 0.3, respectively. The numerical simulation results were obtained using the three-dimensional incompressible RANS equations. The SST k–ω turbulence model was used. The axial interference factor and tangential interference factor were significantly affected by the rotation at the region of the blade near wake. When the air flowed over the blade, there was an obvious velocity deficit at the near wake. This velocity deficit gradually decreased as the air flows downstream. The axial and tangential interference factors were affected by wind shear at the region of the blade near wake. The influence was more obvious as the shear coefficient increases.