水下高速航行体对转螺旋桨线谱噪声预报研究(英文)

Prediction of Line-Spectrum Noise Induced by High Speed Vehicle Contra-Rotating Propellers in Water

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桨相互干扰所引起的。线谱噪声的预报方法是利用升力面理论和声学方法相结合实现的。文中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。预报值和试验结果吻合良好。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。

Line-Spectrum noise of contra-rotating propellers has constructed the main part of the radiatednoise of high speed vehicles in water. The line-spectrum noise of the contra-rotating propellers is due to theinteraction between the wake of the vehicle and the contra-rotating propeller,and the interaction betweenfore and aft propellers. Based on a combination of the lifting surface theory and acoustic techniques, theprediction method of line-spectrum noise is presented in this paper. Theoretical calculation method, characteristics and numerical prediction of the line-spectrum noise are detailed in this paper. The effect of differentwake and different gap between fore and aft propellers on the propeller noise is also studied by numericalmethod. The agreement of predicted results compared with existing experimental data is quite satisfactory.Therefore,the methods are to have important values for performance prediction of the vehicles identificationof the noise sources and acoustic design of contra-rotating propellers,etc.