摘要：为了提高喷嘴的雾化效果,将液体射流的自激振荡理论与压力喷嘴雾化进行结合,建立自激振荡射流喷嘴的数值模型,并运用Fluent软件研究体腔系数和射流压力对内部流场及雾化效果的影响。结果表明:喷嘴斜壁的设计使得液体发生反弹和振荡现象,最初在喷嘴射流出口处发生原生涡环,之后逐步向四周扩散,并传动到整个喷嘴内部;随着体腔系数的增大,速度峰值呈先增大后减小的抛物线变化趋势,雾化粒度的变化规律与之相反;确定最佳的体腔系数范围为0.6~1.2,射流压力为3~5 MPa。

关键词：喷嘴雾化；自激振荡；速度分布；数值模拟

Abstract：To improve the spray effect of nozzle, the self-excited oscillation jet theory and pressure nozzle atomization were combined, the numerical model of the self-excited oscillation jet nozzle was established,and the effect of coulomb coefficient and jet pressure on the internal flow field and atomizing was studied using Fluent. The results show that the nozzle inclined wall design makes liquid rebound and oscillation phenomena occur, the original primary vortex ring in the nozzle jet exit,then gradually spread to all around, and drive to the whole inside the nozzle. With the increasing of body cavity coefficient, the velocity peak parabolic trend of first increases and then decreases, and the change rule of atomized particle size instead, which determines the best coefficient of body cavity range from 0.6 to 1.2, and jet pressure from 3 to 5 MPa.

Keywords: nozzle atomizing；self-excited oscillation；velocity distribution；numerical simulation