NREL 5 MW风力机气动特性的数值模拟研究

NUMERICAL SIMULATION OF AERODYNAMIC PERFORMANCE OF NREL 5 MW WIND TURBINE

以NREL 5 MW风力机为研究对象，忽略风轮的仰角和锥角，采用CFD数值模拟方法并选用SST湍流模型研究均匀来流条件下不同风速时风力机的输出功率，并与FAST软件的计算结果进行比较。分析叶片展向不同截面的压力分布和径向速度流场，讨论风力机尾流场速度和湍动能的变化规律。研究结果表明，沿着叶片展向自叶根至叶尖，吸力面压力逐渐降低，低压区覆盖面积逐渐增大；压力面压力逐渐升高，前缘与尾缘附近压力增幅较大。风穿过风轮能量被大量吸收，风轮对来流的阻塞作用主要集中在近尾流区。风轮后随着流体从近尾流区运动到远尾流区湍动能逐渐减小。

The aerodynamic performance of NREL 5 MW wind turbine without tih angle and cone angle is numerically investigated by using CFD numerical simulation method with SST turbulence model in this paper. The power calculated with different velocities in the condition of uniform speed is compared with the result of FAST software. In addition, pressure distribution and radial velocity flow field of blade at different locations along the blade is analyzed. The variation of velocity and turbulent energy of wind turbine wake flow field is discussed. The results showed that the pressure of the suction surface reduces along the blade from blade root to tip and the low pressure area gradually increases. The pressure of the pressure surface increases and the pressure increase sharply near the leading edge and trailing edge. A large number of wind energy is absorbed by the wind turbine, the wind turbine for coming flow blocking action mainly concentrated in the near wake region. The turbulent energy gradually decreases after the wind turbine with the fluid moving from the near wake to the far wake.