Study on Re-entrant Jet Pressure Characteristics of Ventilated Cavitating Vehicles

Abstract

When the re-entrant jet phenomenon generation at the end of ventilated cavity, body surface form high pressure under the meanflow impact. This high pressure moves downstream with the development of ventilated cavitation, and will arouses significant effect on the motion stability of the body. Based on this, this paper through the experimental observation of the reentrant jet phenomenon, captures the characteristics of the pressure surface, the dynamic changes of the re-entrant jet pressure of the underwater vehicle during the development of the cavity are studied. The relationship between the velocity of the cavity and the characteristics of the re-entrant jet pressure is obtained, and under the condition of the vehicle at the angle of water shot back pressure feature. The results show that the re-entrant jet pressure is much higher than the pressure inside the cavity, and the re-entrant jet pressure is obviously changed with the development of the cavities. There are differences in the pressure characteristics between the surface and the back surface.