School of Marine Science and Technology,Northwestern Polytechnical University,Xi′an 710072 ,China ；Northwest Institute of Mechanical and Electrical Engineering,Xianyang 712099 ,China 在期刊界中查找 在百度中查找 在本站中查找
In order to study the trajectory characteristics of shallow angle water entry for high-speed projectile，the experimental study is carried out when the water entry angle is 20°. An air cannon is set up to provide the initial velocity of high-speed projectile. The flow pattern in water entry is captured by a high-speed video camera，and the variations of the parameters are recorded by a built-in measuring system. The experiment results show that smooth and transparent bubbles are formed at the initial stage of water entry，and the projectile moves in a liner trajectory in a supercavitation state. When entering water，due to the existence of roll angular velocity and pitch angular velocity，the projectile forms motion coupled with tail beat and rotation skiing. Based on the VOF multiphase flow model and cavitation model，combined with the dynamic grid technology，the numerical simulation of the experimental conditions is carried out. The results indicate that the cavitation shape and trajectory characteristics obtained by simulation are in good agreement with the experiment result，and this method can effectively predict the water entry trajectory.
