空气动力学学报2025，Vol.43Issue(9)：10-27,18.DOI:10.7638/kqdlxxb-2024.0150
水下航行器围壳结构尾缘锯齿流动噪声控制与机理研究
Study on flow noise control and mechanism by sail trailing edge serrations of underwater vehicle
摘要
Abstract
Inspired by the noise reduction capability of the serration at the owl wing trailing edge,this paper proposes two serration noise reduction structures applied to the sail trailing edge of underwater vehicle,namely,the triangular serration and the iron serration.This paper investigates the effect of serration on the flow and far-field noise characteristics around the sail by using LES and FW-H equations.Quadrupole noise is captured by constructing permeable integral surface combined with"Collapsing-Sphere"equations.The main coherent structures of the sound source are extracted based on the flow field reduced order method,and mapping relationship between the flow field and the sound source is identified.Thus,this reveals the physical mechanism by which trailing edge serrations affect flow noise.The results show that serrations have a double effect on the flow noise,which is the coupled effect of dipole and quadrupole noise.The triangular serration and the iron serration can reduce the overall noise by a maximum of 4.32 dB and 4.86 dB,respectively.However,in regions where the quadrupole noise source is strong,the iron serration amplifies the total noise.The trailing edge serrations block the two sides of the flow from converging at the top and produce flow separation,reducing the turbulent fluctuations in the boundary layer.This destroys the vertical coherence and energy of the pressure pulsations,leading to the dissipation of the dipole noise source.The trailing edge serrations extend the continuous vortex structure in the sail wake stream,and the distortions in the spatial vortex structure increase the Lamb vector amplitude,resulting in a stronger quadrupole noise source energy.关键词
水下航行器/水动力噪声/偶极子噪声/四极子噪声/尾缘锯齿Key words
underwater vehicle/hydrodynamic noise/dipole noise/quadrupole noise/trailing edge serration分类
物理学引用本文复制引用
马智豪,李鹏,郭航,陈克非,杨翊仁..水下航行器围壳结构尾缘锯齿流动噪声控制与机理研究[J].空气动力学学报,2025,43(9):10-27,18.基金项目
国家自然科学基金(12072298,12172311) （12072298,12172311）
西南交通大学博士研究生创新基金项目资助(CX-2025ZD06) （CX-2025ZD06）
