脉冲等离子射流与液体工质相互作用特性实验研究及数值模拟

为了解等离子射流与液体介质间的相互作用特性，采用高速录像系统记录了等离子射流在圆柱充液观察室中的扩展过程，获得了等离子射流在液体介质中轴向、径向扩展位移及扩展速度随时间的变化特性。在实验基础上，建立了等离子射流在液体介质中扩展时的二维轴对称非稳态数学模型，并进行了数值模拟，获得了等离子体和液体两相体积分数时空分布特性，由两相体积分数时空分布图计算得到的Taylor空腔轴向扩展位移与实测值吻合较好。同时获得了射流场中的压力、速度和温度分布，并分析了Taylor空腔的间断机理。

Experimental Study and Numerical Simulation on Property of Pulsed Plasma Jet-Liquid Interaction

In order to understand the plasma jet-liquid media interaction characteristics,a high speed digital camera system was used to record the propagation process of plasma jet in liquid media in cylindrical chamber.The properties of the axial and radial displacements of plasma jet in liquid media and the change in its spread speed with time were obtained.Based on experiment,a two-dimensional-axisymmetric,unsteady mathematical model was developed.Numerical simulation of this process was carried out.The temporal and spatial distributions of volume fractions of plasma and liquid were obtained.The axial displacement calculated from the numerical simulation matches well with that from experiment.The distributions of pressure,velocity and temperature of the flow filed were obtained,and the discontinuous mechanism of Taylor cavity was analyzed.