论文部分内容阅读
在风洞开口实验段,针对不同尖速比应用BSWA VS302USB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,同时在不同尖速比卜.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,230 Hz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.
In the experimental section of wind tunnel opening, noise test was carried out on BSAO VS302USB vibration noise acquisition and analysis system with different tip speed ratio at four angles downstream of the tip of horizontal axis wind turbine. At the same time, Through the comparative analysis of the flow information and the noise information, it is found that the vortex shedding by the blades dissipates energy gradually, the vorticity decreases and the wind energy decreases gradually during the propagation to the downstream of the wind wheel. Vortex shedding in the tip area is mainly determined by the geometry of the structure and has little to do with the rotational speed of the wind turbine. Acoustic signals in the vicinity of 230 Hz may be excited by the rotational movement of the fluid, which is related to the energy of the rotating frequency signal The tip speed ratio increases and increases.