Research on Water Entry and Underwater Trajectory of an Airborne Vehicle with Consideration of Cavity

On the basis of analyzing the relevant information,the paper calculated underwater trajectory of a certain type of airborne vehicle in detail. On the basis of considering entry cavity,we established the kinematics and dynamics model of the water process,and the simulation calculation was carried out in Matlab environment on solving the aircraft with cavity navigation phase fluid power,and two kinds of shape craft under two typical conditions of the water depth,posture and speed change over time were given. The results show that the spread wings of the airborne vehicle has a little influence on cavity time and has a very obvious effect on water ballistic.