摘要
基于Rayleigh-Plesset方程的单一介质可变密度混合模型,建立了水下高速射弹自然空化流动的多相流模型,通过商业软件Fluent自定义函数将边界条件中的来流速度改写为时间函数并嵌入到软件中,分析了射弹在水下高速运动过程中超空泡几何形态的变化规律及其阻力特性,仿真结果表明:超空泡的相对长度、相对直径以及长细比随空化数增加而减小;超空泡的长细比越大,射弹的阻力系数越小;随着射弹速度衰减,射弹总阻力系数增大。
Multi-phase flow model of nature cavitating flow for underwater high speed projectile was built up based on mixture model of a single-fluid with variable density and Rayleigh-Plesset equation. By means of user-defined functions and commercial software Fluent, the stream velocity under boundary conditions was transformed into time function and embedded in software. Variable law of supercavity geometric form and drag characteristics of underwater high speed projectile were analyzed. The simulation results showed that the relative length, relative diameter and aspect ratio of supercavity decrease with the increase of cavitation number. The bigger of aspect ratio of supercavity, the smaller of drag coefficient of projectile. The total drag coefficient of projectile increases with the decrease of sailing velocity.
出处
《火炮发射与控制学报》
北大核心
2008年第3期6-9,共4页
Journal of Gun Launch & Control
基金
国防重点实验室基金资助(9140C300502070C30)
关键词
流体力学
超空泡射弹
空泡流
空泡形态
阻力特性
hydromechanics
supercaviting projectile
cavitating flow
cavity form
drag characteristics.