Flow structures of gaseous jets injected into water for underwater propulsion

查看全文 作　　者：Jia-Ning [1,2]Tang;Ning-Fei [1]Wang;Wei [1]Shyy

机构地区：[1]School of Aerospace Engineering, Beijing Institute of Technology, 100081 Beijing, China;[2]Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, USA

出　　处：《Acta Mechanica Sinica》索引2011年第27卷第4期,共12页

摘　　要：Gaseous jets injected into water are typically found in underwater propulsion,and the flow is essentially unsteady and turbulent.Additionally,the high water-to-gas density ratio can result in complicated flow structures;hence measuring the flow structures numerically and experimentally remains a challenge.To investigate the performance of the underwater propulsion,this paper uses detailed Navier-Stokes flow computations to elucidate the gas-water interactions under the framework of the volume of fluid(VOF) model.Furthermore,these computations take the fluid compressibility,viscosity,and energy transfer into consideration.This paper compares the numerical results and experimental data,showing that phenomena including expansion,bulge,necking/breaking,and back-attack are highlighted in the jet process.The resulting analysis indicates that the pressure difference on the rear and front surfaces of the propulsion system can generate an additional thrust.The strong and oscillatory thrust of the underwater propulsion system is caused by the intermittent pulses of the back pressure and the nozzle exit pressure.As a result,the total thrust in underwater propulsion is not only determined by the nozzle geometry but also by the flow structures and associated pressure distributions. 关键词：水下推进器流场结构气体射流注入水水下推进系统数值模拟流量计算流体体积

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Flow structures of gaseous jets injected into water for underwater propulsion

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