基于Lighthill声类比理论的螺旋桨噪声性能研究

Research on Performance of Propeller Noise Based on Lighthill Acoustic Analogy Theory

基于Lighthill声类比理论和傅立叶变换结合声学软件Actran开展螺旋桨噪声性能的分析研究。以E779A螺旋桨模型为对象,进行了螺旋桨噪声性能的数值模拟,分析了不同位置处声压谱和声功率谱的特性、噪声随距离变化的衰减特性、不同进速系数下的声压级云图等。最后,分析了非均匀进流、螺旋桨空化、进速系数(即轻载、正常荷载、重载)等对螺旋桨噪声的影响。

The performance of the propeller noise is analyzed and researched based on the acoustic analogy theory and the fourier transform combining with the software Actran. The numerical computations of the propeller noise performance for the E779 A model are carried out. The sound pressure level and sound power spectral density in different positions are given. The noise attenuation characteristics with distance changing are presented. Finally, the impacts of the different calculation steps on the calculation results, the impact of velocity changes in flow on frequency spectrum as well as the impact of change of the cavitation number on the acoustic spectral characteristics related to the propeller are studied in the paper.