低压大流量自激脉冲清洗喷嘴内部气液两相流数值模拟

The numerical simulation of liquid-vapor two phase flow in low pressure-high flow rate self-excited pulsed jet nozzle

对自激脉冲发生的物理过程进行分析,采用气液双流体理论,考虑圆孔射流的轴对称性,耦合振荡腔内的空化模式,建立二维非定常气液双流体模型的控制方程.采用气液两相流SIMPLE解法,对低压大流量自激脉冲清洗喷嘴内部气液两相流进行数值模拟,追踪振荡腔内空化的演变过程,解释低压大流量自激脉冲射流的发生机理.

Two dimensional non-steady double fluid model equations including gas and liquid are established by using the two-fluid model of liquid and vapor, employing the axially symmetric circular hole jet, combining the cavitation characteristics in the oscillation chamber through the analysis on the physical process of the self-excited pulse. The numerical simulation is conducted using double fluid SIMPLE algorithm to trace the cavitation changing process in the low pressure-high flow rate self-excited pulsed jet nozzle. The forming mechanism of the jet is explained in this paper.