固定偏航下风力机输出功率及涡声关系的研究

Research on the power output of wind turbine and relationship between vortex and sound under fixed yaw condition

文章研究了偏航条件下风力机的出力及气动噪声,对固定偏航下的风力机进行了非定常数值模拟。研究结果表明:偏航角每增加10°,升力系数平均值分别降低2.0%,5.7%,10.6%,输出功率分别下降为3.90%,11.11%,19.77%;随着偏航角的增加,中心涡扩散区域增大,涡量强度增强,声压级也相对较强;中心涡对尾迹声辐射的影响长度较长,叶尖涡影响长度较短。

The power output and aerodynamic noise of wind turbine under yaw condition were studied in this paper, The unsteady numerical model of wind turbine under fixed jaw was simulated and the results showed that when the yaw angle were increased by ten degrees, lift coefficient average values were relatively reduced by 2.0% ,5.7% and 10.6%, and the power output were dropped to 3.90%, 11.11% ,19.77% ,respectively;Meanwhile, the center eddy diffusion area were increased with the addition of the yaw angle and vortex intensity were enhanced relatively, the sound pressure levels also became strong. The center vortex had a long influence on the wake sound radiation,while the tip vortex had a short influence on the wake sound radiation.The research can provide some basic information on the numerical simulation and test of the aerodynamic characteristics, and noise of wind turbine in the fixed yaw field.