扩展角对收缩-扩散型喷嘴空化效果的影响

The Extend Angle′s Effects on the Cavitation of Convergence-Divergence Nozzle

喷嘴扩展角是影响收缩-扩散型喷嘴空化效果的重要参数之一。运用连续方程、动量方程和Rayleigh-Plesset方程,对流经不同扩展角的收缩-扩散型空化喷嘴的泡液流进行稳态求解。计算结果表明:扩展角的存在对液泡流的流动特性有强烈影响,随着扩展角的变化,喷嘴空隙率和气泡半径呈现"剧烈振荡"。空泡在临界值附近大幅值、高频率振荡导致的空泡多次溃灭过程,将有利于释放更大的空化能量。

The extend angle is a major parameter to effect the cavitation of convergence-divergence nozzle.Applies continuity equation,momentum equation and Rayleigh-Plesset equation to the steady-state solutions of bubbly liquid through different extend angles of converging-diverging nozzle.The results show that the flow properties are affected dramatically by the extend angels and the void fraction and the bubble radius vibrate violently with the increasing of the extend angle.With large-amplitude and high-frequency oscillating near the threshold,bubble creates and collapses repeatedly,which will help to release more cavitation energy.