艇桨一体的螺旋桨激振力和水动力噪声数值预报

Numerical prediction of propeller excitation force and hydrodynamic noise of submarine with propeller

[目的]螺旋桨噪声和水动力噪声是潜艇噪声控制的重点和难点,因此有必要开展艇桨一体的螺旋桨激振力和水动力噪声预报研究。[方法]以SUBOFF潜艇和DTMB 4383桨为计算对象,结合大涡模拟湍流模型和无限元方法,分析潜艇非均匀伴流场中螺旋桨激振力的变化规律,以及螺旋桨对潜艇表面压力场的影响。采用ACTRAN声学计算软件对艇桨一体的水动力噪声性能进行数值预报。[结果]计算结果表明:螺旋桨激振力的各个分量具有相同的脉动频率,脉动峰值以一阶叶频处为主,同时水平力脉动和垂直力脉动大于推力脉动;潜艇艏部、指挥台、艉翼及螺旋桨叶梢部位均存在局部高压区,这是水动力噪声的主要贡献点;艇桨一体的水动力噪声主要集中在低频段,随着频率的增加,其蝶形分布更加明显;与无桨全附体潜艇相比,带桨潜艇特征点的声压值急剧增加,对其辐射声场的影响较大。[结论]研究成果可为艇桨一体的螺旋桨设计提供参考建议。

[Objectives]Propeller noise and hydrodynamic noise are the key and difficult points of submarine noise control.Therefore,it is necessary to carry out propeller excitation force and hydrodynamic noise prediction research.[Methods]With the SUBOFF submarine and DTMB 4383 propeller as the calculation object,combined with the large eddy simulation turbulence model and the infinite element method,the change rule of the propeller excitation force in the non-uniform accompanying flow field of the submarine and the influence of the propeller on the surface pressure field of the submarine are analyzed.The ACTRAN acoustic calculation software is used to numerically predict the hydrodynamic noise performance of the integrated boat.[Results]The calculation results show that the components of the propeller excitation force have the same pulsation frequency,the pulsation peak is mainly the first-order leaf frequency,and the horizontal force pulsation and vertical force pulsation are greater than the thrust pulsation.The high pressure area exists at the bow,command station,tail and blade tip of submarine,which is the main contribution point of hydrodynamic noise.The hydrodynamic noise of the boat and propeller is mainly concentrated in the low frequency band,and the butterfly distribution is more obvious as the frequency increases.Compared with the propeller's full-body submarine,the sound pressure value of the submarine's characteristic point increases sharply due to the rotation of the propeller,and the variation of the radiated sound field is also large.[Conclusions]The research results can provide reference for the propeller design of the propeller.