Numerical Study on the Characteristics of the Interaction between a Plasma Jet and a Liquid Media in an Asymptotic Boundary

In order to explore the factors affecting the expansion characteristics of plasma jet in liquid propellant, a two-dimensional axisymmetric unsteady mathematical-physical model is established and verified, revealing that the interaction between plasma jet and liquid propellant. The numerical analysis of the expansion characteristics of plasma jet in simulated liquid propellant under different nozzle diameters and injection pressures are carried out, and the results show that the increase of nozzle diameter brings about the growth of axial extension displacement of the plasma jet, while the reasonable selection of nozzle diameter can effectively control the Kelvin-Helmoltz instability. The increase of the injection pressure strengthens the expansion- compression wave characteristic of the plasma jet and facilitates the growth of the plasma jet velocity. However, the expansion of the Taylor cavity are promoted with an increase of injection pressure, which can enhance the Taylor instability in the expansion process of the plasma jet.