Analysis of a High-Speed Underwater Supercavitating Projectile Dynamics, Based on an Experiment

In this article, we extracted the forces and moment of a supercavtation projectile according to the former experimental work that is exist within literature. regards to the projectile high-speed and the illustration technique, it's safe to say that this experiment is one of the most attractive examples which is exists in the literature. In this test, projectile after leaving the launcher and moving a short path in the air, enters at a low angle to the free surface of the fluid (water). Due to the availability of the experiment test multimedia and thank to the image processing techniques in this paper, speed and acceleration values of the projectile were extracted. In the next step, forces, moments and hydrodynamic coefficients of the projectile were evaluated. The results in this study show that the value of the drag coefficient (C_D) are in good agreement with existing predictions, but the results related to the values of the lift and moment coefficients (C_L and C_M), contain new and important information in which it will change some of the former assumptions in the literature. The present study also provides useful information about projectile angular velocity which is used in the study of the stability of motion of such devices