偏航流动对水平轴风力机声辐射影响研究

Research on influence of yaw on sound radiation of horizontal axis wind turbine

风力机处于复杂多变的自然风条件下,经常处于偏航状态。文章运用分离涡方法(DES)寻找偏航流动对水平轴风力机声辐射的影响。结果表明:随偏航角度的增加,风轮输出功率减小;垂直风轮旋转面和平行来流方向的测试线上,总声压级都随着远离风轮旋转面逐渐衰减,且随着偏航角的增大,平行来流方向测试线上的声压级降低较快;在不偏航流动下平行于风轮旋转面的声压级,沿旋转方向基本相同,在偏航流动下,随偏航角度的增大而降低;平行于入口面上距离声源面近的一侧声压级较大,且随偏航角的增加逐渐升高;叶尖处声压级最大,中心轴上最小。DES方法用于风力机声辐射的模拟研究是可行的,对风力机气动噪声研究具有一定的参考价值。

Wind turbines often yaw because they are working in complex natural conditions. In this pa- per, the detached-eddy simulation （DES） was used to find airflow influence on sound radiation of hor- izontal axis wind turbine at yaw condition. The results shown that wind rotor output power decreased with increasing of yaw angle; sound pressure levels （SPL）, which were gotten from sensors arranged in a line perpendicular to rotor rotation plane and parallel to incoming flow, decreased gradually away from the rotor plane, and SPL decreased faster with the yaw angle increasing, it decreased quickly par- allel to the flow direction; the SPLs which parallel to the rotor were basic same along the rotation direc- tion without yaw, decreased with the yaw angle increasing; the SPLs which parallel to the inlet were larger and rose with the yaw angle increasing; it was the largest at the tip of blades and smallest on the central axis. DES method was feasible for simulation study of wind turbine sound radiation, the related research results could provide a certain reference for the study of aerodynamic.