Dynamic Features Of Kinetic Energy Supercavitating Vehicles

Stability is an important issue for the application of kinetic energy supercavitating vehicles. Interactions of supercavitating vehicles with their fluid environment are exceptionally complex. Traditionally, the kinetic modeling is established in the longitudinal plane, which is inevitable to lose some important features of 6DOF dynamic system. On the basis of general dynamics theory, a 6DOF dynamic system is established for kinetic supercavitating vehicles. Credibility of this model assesses through experiments and empirical estimation equation. The conception of limit-angle and chi-chi(lim) chart are proposed for analyzing the stability of kinetic supercavity vehicles. The instability mechanism is discussed and the calculation method of velocity stable range is given. These works provide the theoretical basis for the engineering. Besides, the cavity cross and position where the tail-slap occurs is visualized in three-dimensional Cartesian coordinates, which could provide a reference for further research on the ballistic dispersion of supercavitating vehicles. Additionally, the further regular of the angular velocity is found. When the vehicle moves in supercavity the hydrodynamic point of the cavitator would change, which changes the angular velocity.