基于扇声源理论的螺旋桨负载噪声频域预报

发布时间：2018-06-18 17:07

本文选题：螺旋桨 + 负载噪声　；参考：《推进技术》2016年08期

【摘要】：为了准确计算螺旋桨噪声,以均匀进流条件下船用E779A螺旋桨为研究对象,采用扇声源方法结合边界元方法对螺旋桨的负载噪声进行了数值预报,研究了扇声源方法中等效偶极子不同划分方案对螺旋桨负载噪声计算精度的影响。结果表明:采用扇声源方法结合边界元方法能够准确预报螺旋桨的负载噪声,在低频处计算值与文献值相差最大不超过4d B;不同频率对应的指向性均呈现8字形分布,其中叶频和二倍叶频对应的指向性在桨轴方向声压级最大,而三倍叶频对应的指向性在径向方向声压级最大;叶片等效的旋转偶极子越多,低频噪声的计算精度越高,在叶频和二倍叶频处的计算值与文献值相差最大不超过1.2d B。
[Abstract]:In order to calculate the propeller noise accurately, taking the marine E779A propeller as the object of study, the fan sound source method combined with the boundary element method is used to predict the load noise of the propeller numerically. The effect of different partition schemes of equivalent dipoles in fan sound source method on the calculation accuracy of propeller load noise is studied. The results show that the fan sound source method combined with the boundary element method can accurately predict the load noise of propeller, and the maximum difference between the calculated value and the reference value at low frequency is not more than 4 dB, and the corresponding directivity of different frequencies shows an 8-shaped distribution. The directivity of the blade frequency and the double blade frequency is the largest in the axial direction of the propeller, while the direction of the triple blade frequency is the largest in the radial direction, and the higher the accuracy of the calculation of the low frequency noise is, the more the rotating dipole is equivalent to the blade, the higher the accuracy of the calculation of the low frequency noise is. The maximum difference between the calculated value and the reference value at the leaf frequency and the double leaf frequency is not more than 1.2 dB.
【作者单位】：海军工程大学动力工程学院;
【基金】：国家自然科学基金青年基金资助项目(51306205)
【分类号】：U661.44

【相似文献】