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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 an important parameter that affects the cavitation effect of the shrink-diffuser nozzle. Using the continuous equation, the momentum equation and the Rayleigh-Plesset equation, the bubble solution flow through the shrink-diffuser nozzle is solved in steady state. The calculated results show that the small inlet voids in the bubble liquid flow strongly influence the flow characteristics and have significant similarities with the change of the non-dimensional nozzle length on the flow characteristics. With the increase of the nozzle length, the critical value of the nozzle inlet porosity decreases exponentially with the bubble radius increasing linearly.