水下高速航行体对转螺旋桨线谱噪声预报研究

对转螺旋桨的线谱噪声构成了水下高速航行体整个辐射噪声的重要部分.对转螺旋桨的线谱噪声是由前后桨与航行体尾流场相互作用及前后装相互干扰所引起的.线谱噪声预报方法是利用升力面理论和声学方法相结合实现的.详述了线谱噪声的理论计算方法、线谱噪声的特征和数值预报,同时也预报了尾流场的变化、前后桨间距变化对噪声级的影响等.预报值与实验结果吻合很好.整个方法对航行体的性能预报、噪声源识别和桨的低噪声设计均具有重要价值.

prediction of line-spectrum noise induced by high speed vehicle counter-rotation propellers in water

Line-Spectrum noise of counter-rotation propellers has constituted the main part of radiated noise of high speed vehicles in water.The line spectrum noise of the counter-rotation propellers is due to the interactions between fore or aft propeller and wake of the vehicle,and the interaction between fore and aft propeller.Based on a combination of the lifting sllrface theory and acoustic thecniques,the prediction method of line-spectrum noise is presented in this paper.Theoretical calculation method,characteristics and numerical predition of the line-spectrum noise are detailed in this paper.The effect of different wake and different distance between fore and aft propeller on the propeller noise is also studied by numerical method.The agreement of predicted results compared with existing experimental data is quite satisfactory.So that,the methods are to have important values for performance prediction of the vehicle.inspection of the noise sources and acoustic design of counter-rotation propellers,etc.