偏航对水平轴风力机尾迹的影响

Effect on the wake of horizontal axis wind turbine turbine under yaw condition

文章采用数值模拟结合理论分析的方法,对在偏航工况下额定功率为300 W的S翼型水平轴风力机进行计算和分析。首先进行网格无关性验证,在此基础上对4个偏航工况进行数值模拟,对比分析了风轮后不同截面上的尾迹速度和尾迹偏转角。结果表明,偏航导致尾迹中心产生一定程度的偏斜,尾迹形状卷曲不对称,风力机尾迹缩短;随着偏航角的增大,尾迹偏转角增大;随着传播距离的增加,偏转程度逐渐减小,风轮上、下侧尾迹偏转差别很大。

The numerical simulation combined with the theoretical formula were used to calculate and analyze the S-winged horizontal-axis wind turbine with the rated power of 300 W under yaw conditions. Firstly,the grid independently verification were carried out. Based on this, the numerical simulation were carried out on four yaw conditions, and the wake velocity and wake deflection angle on the different cross sections of the wind wheel were compared and analyzed. The results showed that the yaw causes the skim center to produce a certain degree of skew,the trailing shape curly asymmetry,the wind turbine wake were shortened;with the increase of the yaw angle, the traverse deflection angle increases;with the increase of the propagation distance,the degree of deflection decreases, and the deflection of the upstream and downstream wake were very different.