静音水下航行器的水动力特性数值研究

Numerical Investigation of Hydrodynamic Characteristic of Undersea Vehicle with Low Noise

为了克服传统螺旋桨推进航行器推进效率低、灵活性差和噪声大的缺点,针对一种仿生柔性体推进的水下航行器的水动力特性进行数值研究,分析柔性体波动的振幅和波数对水动力特性的影响、仿生表面对水动力性能的影响以及整体设计对水动力特性的影响。数值结果表明,增大振幅将显著地增大静水推力,同时增加推进阻力;增加波数则显著地增加推进阻力,并减小静水推力。此外,使用仿生表面和现有的前尖端设计,可以减小推进阻力。研究结果有利于进一步优化航行器,提高航行器推进效率。

Given that the shortcomings of low propulsion efficiency,poor flexibility,and high noise of traditional propeller propulsion vehicles,numerical investigation of hydrodynamic characteristics of a new undersea vehicle propelled by bionic flexible bodies is conducted in three aspects:1)the effect of amplitude and wave number of flexible body motions;2)the effect of bionic surface of the vehicle;and 3)the effect of overall design of the vehicle.The numerical results show that increasing the amplitude will significantly increase the hydrostatic thrust and the propulsion resistance,while increasing the wave number will significantly increase the propulsion resistance and decrease the hydrostatic thrust.In addition,the front tip design of the vehicle and the bionic surface of the vehicle can reduce the propulsion resistance.These findings are beneficial to further optimize the vehicle and improve the vehicle propulsion efficiency.