涡轮机械、航空发动机、高速直升机推力桨等旋转部件气动噪声的预测一直是气动声学研究领域的热点，对其噪声准确预测不仅要计算桨叶旋转时产生的气动噪声，而且还要考虑固定壁面对噪声的散射效应。相比于静止介质而言，考虑介质运动的旋转声源散射声场预测更贴近实际情况，研究难度也更大。本项目拟基于对流FW-H方程构建运动介质中旋转声源散射声场计算模型，利用改进的时域等效源法计算分析基于对流FW-H方程的旋转声源散射声场变化情况，分析时间离散步长、源点位置、源点数量等参数对声源散射声场及总声场的影响规律，给出不同参数的取值范围。在此基础上，以X2复合式高速直升机为研究对象，利用建立的预测方法计算运动介质中考虑机身散射效应的推力桨噪声，分析推力桨声场声压级云图，获得介质运动方向及速度对推力桨噪声指向性的影响机制。该项目的完成将为运动介质中高速直升机推力桨气动噪声预测技术奠定一定的理论基础。

The prediction of aerodynamic noise of rotating parts such as turbine machinery, aeroengine and high-speed helicopter thrust propeller has always been a hot topic in the field of aeroacoustics. The accurate prediction of the noise not only needs to calculate the aerodynamic noise generated when the blade is rotating, but also considers the scattering effect of the fixed wall to the noise. Compared with the stationary medium, the scattering field prediction of rotating sound source considering the motion of the medium is closer to the actual situation and more difficult to study. Based on the convection FW-H equation, this project intends to construct a calculation model for the scattered sound field of rotating sound source in moving medium. The improved time-domain equivalent source method is used to calculate and analyze the variation of the scattered sound field of the rotating sound source based on the convection FW-H equation. The influence law of the parameters such as the length of time travel, the position of the source point and the number of source points on the scattered sound field and the total sound field of the source is analyzed, and the value range of different parameters is given. On this basis, taking the X2 composite high-speed helicopter as the research object, the established prediction method is used to calculate the thrust propeller noise in the moving medium considering the scattering effect of the fuselage. The influence mechanism of the motion direction and velocity of the medium on the noise directivity of the thrust oar was obtained by analyzing the cloud image of the sound pressure level of the thrust oar sound field. The completion of this project will lay a theoretical foundation for the aerodynamic noise prediction technology of high-speed helicopter thrust propeller in moving medium.