【作者】 易文俊； 张木； 谭俊杰； 陈志华；

【Author】 YI Wen-jun,ZHANG Mu,TANG Jun-jie,CHEN Zhi-hua (National Key Laboratory of Transient Physics,NUST,Nanjing 210094,China

【机构】 南京理工大学瞬态物理重点实验室；

【摘要】 基于Navier-Stokes方程,考虑气液间相变,采用大涡模拟湍流模型,PISO算法及VOF方法,利用自行开发程序对三维高速航行体的非定常空泡流动进行了数值模拟研究。研究了Kunz空化模型对高速航行体空泡形态的影响,以及计算了不同空化数条件下的水动力系数。通过计算结果得到超空泡从航行体头部初生至完全包裹弹身的形成过程,计算不同攻角条件下的超空泡形态,并给出航行体表面空泡厚度分布曲线,分析不同攻角对超空泡形态特性的影响规律,将计算结果与实验数据进行对比,两者吻合较好。研究结果为进一步研究水下高速航行体的水动力特性和弹道特性问题提供理论基础。更多还原

【Abstract】 Based on the Navier-Stokes equations,adopting the LES turbulence model,algorithm of PISO and VOF method,the numerical simulation of three-dimension unsteady cavitating flow around supercavitating body adopting the self-developed program has been implemented in this paper,through the consideration of mass transfer between gas and liquid.The process that the supercavity configuration produces from warhead of body until enwraps the whole body is achieved. Based on it,the cavity configuration is calculated at different attack angles,and the distributed curves of cavity thickness on the surface of the body are also given.The analysis that different attack angles influence the configuration characteristic of cavity has been made,and also the effect of empennages and cavity configuration in conditions of zero attack angle.Furthermore,the dimensionless length and thickness of supercavity at different cavitation numbers have been calculated.The comparison of calculation result with experiment result has been made.It is indicated that numerical result can preferably agree with the experimental result.This research offers academic reference for the study of hydrodynamics and ballistic performance of underwater bodies..更多还原