Investigation of underwater motion parameters for inert conical models

This paper considers high-speed underwater motion of an axisymmetric inert conical model in a supercavitation flow regime. Experimental data on the model velocity variation with distance in water are obtained. Based on these data, a computational method, which is developed to determine the model velocity, is validated. A comparison of the calculated and experimental results obtained in a hydroballistic track shows that, in the first approximation, the motion of the model in a supercavitating flow regime can be considered as the motion of a flat disk having a mass and being streamed around at the developed cavitation directed normally to the surface. Experimental contours of supercaverns are compared with those calculated using the known computational methodology. The conditions ensuring supercavitation motion of the inert conical models in water are determined. As a result, the extended range of the horizontal motion is calculated for the inert conical models moving in a supercavitation regime under water at a depth up to 200 m at given initial velocity, depth of the trajectory location, and model parameters. It is found that reducing of a cavitator radius does not always have a positive effect on the range of the inert model motion.