关键词: 噪声;螺旋桨;声压;数值法和计算方案

Abstract: A method for calculating the acoustic pressure of a propeller due to blade thickness and steady surface pressure loading (including the effect of forward motion) is presented in this paper. The blade tip speed is limited to subsonic. The formulation is based on the FW-H equation. The blade parameters and observer position are described in three coordinates. The retarded time equation is solved numerically by Newton’s method. The surface integration is calculated by a cubic spline program. Noise frequency spectrum is analysed by used a FFT program.A good agreement is found between theoretical and experimental results within both the time and frequency domains.

Key words: Noise;Propeller;Sound pressure;Numerical method and procedure