Numerical Simulation of Flow Field Characteristics of Supersonic Jet in Natural Cavitating Tail Cavity

Abstract

In order to reveal the evolution law of the supersonic flow field in the natural cavitating tail cavity and the flow field structure in the cavity, this paper simulated the flow field of the supersonic jet in the natural cavitating tail cavity based on the volume of fluid (VOF) multiphase flow model. The paper compared the distribution of the flow field parameters in the cavity under different cavitation number and different angles of attack of incident flow, and drew the following conclusions: The cavity shape of the natural cavitating tail cavity is relatively stable after the incident flow of the supersonic jet, and its evolution is mainly concentrated in the closure of the cavity tail. The development of the flow field of the supersonic jet in the cavity is mainly affected by the re-entrant jet. When there is no angle of attack of incident flow, the flow field is impacted by the re-entrant jet, and the axial development of the jet is suppressed. The axial jet appears retracted phenomenon. When there is an angle of attack of the incident flow, the position of the re-entrant jet has shifted, and the shear and suction effect is dominant. The axial development of the jet is rapid, and the stability of the attitude of the vehicle is mainly affected by the impact of the incident flow and the distribution of the surface high-pressure area. When the cavitation number is small, increasing the angle of attack of the incident flow can greatly increase the pitching moment of the vehicle.

Keywords

• natural cavitation
• supersonic jet
• tail cavity
• flow field