收缩—扩散型喷嘴长度影响空化效果的数值分析  

Numerical analysis for effect of the convergence-divergence nozzle length on cavitation

作　　者：张凤华[1] 刘海锋[1] 唐川林[1] 

机构地区：[1]湖南工业大学机械工程学院,湖南株洲412007

出　　处：《水动力学研究与进展（A辑）》2011年第3期307-311,共5页Chinese Journal of Hydrodynamics

基　　金：科技部国际科技合作项目(2008DFA70300)资助

摘　　要：喷嘴长度是影响收缩—扩散型喷嘴空化效果的重要参数。运用连续方程、动量方程和Rayleigh-Plesset方程,对流经收缩—扩散型喷嘴的泡液流进行稳态求解。计算结果表明泡液流中很小的入口空隙率对流动特性有强烈影响,并随着无量纲喷嘴长度的变化对流动特性的影响有着显著的相似性。随着喷嘴长度的增长,喷嘴入口空隙率临界值以指数规律下降,气泡半径呈线性增长。the nozzle length is a major parameter to effect the cavitation of convergence-divergence nozzle. Applying continuity equation, momentum equation and Rayleigh-Plesset equation, the steady-state solutions of bubbly liquid through converging-diverging nozzle are analyzed. It is shown that the flow properties are affected dramatically even though the void fraction in cavitating flow is very small. The notable comparability of the flow properties is observed with the change of dimensionless nozzle length. With the increasing of nozzle length, the critical value of the void fraction at nozzle entrance drops exponentially, and the bubble radius rises linearly.

关 键 词：收缩-扩散型喷嘴:空化喷嘴 喷嘴长度 分岔 

分 类 号：TK71[动力工程及工程热物理—流体机械及工程]