基于Lighthill声类比理论的螺旋桨噪声性能研究

论文基于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、进速系数等对螺旋桨噪声的影响。本文主要的研究工作是对螺旋桨噪声性能的预报研究，对今后船舶工程螺旋桨的设计研究有着重要的指导意义。

Research on performance of propeller noise based onLighthill acoustic analogy theory

The propeller noise is forecasted using Actran based on acoustic analogy theory and fourier transform. Numerical computations of propeller noise for E779A model are carried out. The sound pressure level and sound power spectral density in different positions are given. The noise attenuation characteristic with distance changing is 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. This paper is devoted to forecast propeller cavitation and noise, which makes sense for the design of propeller.