风电机组噪声预测

在已有后缘为钝形双叶片风电机组噪声预测模型基础上,结合我国风力发电机组叶片形状及其辐射噪声的频谱特性等,对预测模型进行了修正.通过对3台不同型号风电机组13个测点噪声测量值和预测值对比验证表明,修正后模型能较好地反映风电机组噪声的衰减规律.在预测点与风轮中心距离大于1.5倍风轮直径时,修正后模型预测值与实测值差值在±2.5dB(A)范围内.利用修正后预测模型计算确定的风电机组噪声声功率级及指向性指数,将其代入考虑指向性的点声源模型,可用于简化预测与风轮中心距离大于3倍风轮直径处的噪声.

Noise prediction of wind turbines

Based on the blade shape and the radiated noise frequency spectrum of wind turbines in China,the noise prediction model for wind turbines with blunt trailing edges is modified.Noise of wind turbines of three kinds is measured at 13 sampling points,which is also predicted using the modified model.The results show that the modified model could well reflect the noise attenuation of wind turbines.When the distance between rotor center and receiver is greater than 1.5 times the rotor blade diameter,the difference between the measurement values and the predicted values of the modified model is within ±2.5 dB(A).Using the modified model,sound power level and directivity index of different kinds of wind turbines can be calculated.So the noise prediction model can be simplified if the distance between rotor center and receiver is greater than 3 times the rotor blade diameter.