Numerical simulation and analysis of the underwater implosion of spherical hollow ceramic pressure hulls in 11000 m depth  

作　　者：Shengxia Sun Fenghua Chen Min Zhao 

机构地区：[1]State Key Laboratory of Ocean Engineering,School of Naval Architecture,Ocean and Civil Engineering,Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Ocean Engineering and Science》2023年第2期181-195,共15页海洋工程与科学（英文）

基　　金：the support from the National Natural Sciences Foundation of China(51779139,U2067220);the National Key Research and Development Program of China(Grant No.2016YFC0300700);Shanghai Talent Development Funding(2018029);the Young Talent Project of China National Nuclear Corporation.

摘　　要：Pressure hulls play an important role in deep-sea underwater vehicles.However,in the ultra-high pressure environment,a highly destructive phenomenon could occur to them which is called implosion.To study the characteristics of the flow field of the underwater implosion of hollow ceramic pressure hulls,the compressible multiphase flow theory,direct numerical simulation,and adaptive mesh refinement are used to numerically simulate the underwater implosion of a single ceramic pressure hull and multiple linearly arranged ceramic pressure hulls.Firstly,the feasibility of the numerical simulation method is verified.Then,the results of the flow field of the underwater implosion of hollow ceramic pressure hulls in 11000 m depth is analyzed.There are the compression-rebound processes of the internal air cavity in the implosion.In the rebound stage,a shock wave that is several times the ambient pressure is generated outside the pressure hull,and the propagation speed is close to the speed of sound.The pressure peak of the shock wave has a negative exponential power function relationship with the distance to the center of the sphere.Finally,it is found that the obvious superimposed effect between spheres exists in the chain-reaction implosion which enhances the implosion shock wave.

关 键 词：Underwater implosion 11000 m depth Hollow ceramic pressure hull Compressible multiphase flow Adaptive mesh refinement Chain-reaction implosion 

分 类 号：P74[天文地球—海洋科学]