中文摘要：

在风洞开口实验段，针对不同尖速比应用BSWAVS302USB振动噪声采集分析系统对水平轴风力机叶尖下游4个角度的测试线进行噪声测试，同时在不同尖速比下对风轮近尾迹不同方位面内的瞬时速度场进行PIV测试。通过对流动信息和噪声信息的对比分析发现，叶片脱落的涡系在向风轮下游传播的过程中，能量逐渐耗散，涡量降低。风轮叶尖区域脱落的涡系主要是由结构的几何形状决定，与风轮旋转速度的关系较小。230Hz附近频带声信号可能是由于流体的旋转运动激发，它与旋转频率信号的能量随着尖速比的增加而增大。

英文摘要：

In wind tunnel opening, the noise in four test lines was measured by BSWA VS302USB Noise and Vibration Analysis System under different tip speed ratio, the PIV measure of the instan- taneous velocity field in different azimuth plane of rotor near wake was carried out. By comparison of the flow and sound signal, it was found that vortex system shedding from blade is dissipation and its vorticity decreases gradually as it propagate downstream. The vortex system shedding from blade tip region is mainly caused by the geometry of the structure and the rotor rotation speed slightly. The acoustic signal near 230 Hz may be excitation by fluid rotary motion, its energy and rotating frequency signal energy increase with tip speed ratio.