气环对水射流流场影响的数值模拟分析

Numerical Simulation Analysis of the Gaseous Ring Affecting Water-Jet Flow Field

为从理论上证明周围气环具有抑制中间水射流衰减的作用,选取现场试验中效果良好的典型水气喷嘴组合进行分析,得出在有无气体保护下,处于水淹没环境中的水射流流场中动压力的分布状况,绘制出不同时刻流场的动压力分布云图、水喷嘴中轴线上的动压力沿流线的分布图。从反映水射流衰减的动压力分布规律得出气环保护能提高水射流的射流能力,并分析了气环减缓水射流衰减的原因。

In order to improve the around gaseous ring can prevent the water jet in the center from damping, choosing the better air-water nozzle in the site test. By the way of analyzing the situations of the water jet with or without gas protection, under the submerge condition of water, to get the charts of the flow fields＇ contours of dynamic pressure at different times and the values of the dynamic pressure along the axial line of the water nozzle, consequently, the conclusions that the gaseous ring can protect the water jet and why it can do it are obtained.