非均匀湍流场中螺旋桨噪声研究

Propeller noise study in non-uniform turbulence

针对螺旋桨在湍流中的非定常噪声问题,在均匀湍流下螺旋桨宽频噪声相关性法的基础上,推导了非均匀湍流下螺旋桨宽频噪声的公式。在均匀湍流的研究中使用了十桨叶螺旋桨模型,并将计算结果与试验数据进行了对比,发现吻合较好。对于非均匀湍流中的问题,研究发现湍流的不均匀程度不会对宽频谱波峰的位置产生影响,噪声谱波峰的位置仍然取决于叶频,湍流的不均匀程度只会改变叶频处的波峰高度。最后研究了均匀湍流和非均匀湍流中侧斜角对螺旋桨噪声的影响,发现桨叶侧斜角的存在会降低螺旋桨在湍流中受到的宽频噪声。

Based on the correlation approach in uniform turbulence,the formula of propeller broadband noise in non-uniform turbulence was deduced to analyze the unsteady noise problem of propeller.For uniform turbulence,the ten-bladed propeller model was used,and the calculated result was compared with the experiments data,which shows a good agreement.For non-uniform turbulence,the results show that the degree of non-uniformity have no effect on the position of the peak in sound spectrum which depends on the blade frequency,but it can change the degree of hump in blade frequency.Finally the effects of skew angle to propeller noise in uniform and non-uniform turbulence were studied,and the results show the skew angle of blade can reduce the noise spectrum of propeller in turbulence.