螺旋桨涡旋噪声预报

Prediction of Propeller Vortex Noise

涡旋噪声是非空泡螺旋桨噪声连续谱的主要成分，有必要对它进行定量的估计。另一方面，预报随边涡发放频率和强度也是预报唱音的基础。本文采用半经验半理论的方法，其中螺旋桨叶元随边的涡发放特性根据单叶片的实验规律总结而得，整个桨叶的辐射噪声用力源的公式导出。与以往工作不同的是，本文给出了涡旋噪声功率谱密度函数，据此可以预报非均匀流场中变截面桨叶的涡旋噪声谱。

Vortex noise is a major component of the continuous spectrum of non -- cavitating propeller noise.AqUantitative estimation of it is reqUired. On the other hand, prediction of freqUency and strength of vortex sheddingis the base of ptalichon of propeller singing. This paper presentS a send -- empirical theory, in which featUres of thetalling edge vortex shedding from blade elementS are summarized according tO experimental results of an isolatedhydrofoil. The radiated noise of the whole blade is derived from the force source formula. Differing from other research, this paper presents the Power spectrum density of the vortex noise, which make the prediction of the vortexnoise spectrum of a varied blade section in inhomogeneous flow be possible.