Cavchenko G. Hydrodynamic characteristics of the wall cavitation flows

The dissertation is dedicated to the wall supercavitation and spray flows research. The study is based on the method of hydrodynamic experiment with following processing and generalization of the obtained data. Experimental research and calculations allow to find the main parameters and regularity of the wall supercavity creation on a solid of revolution and flat surface. The role of a boundary layer influence to the size of the wall cavern when a cavitator size is smaller then the boundary layer is shown. The design equation for a cavitation drag of the wall cavitator is obtained. Special attention is devoted to flush and spray flows that appear in a wall supercavity. The optimum performance of a drag reduction for distributed gas blowing is obtained experimentally and numerically. The drag reduction advantage of ribbed surfaces is discovered. PC subroutines to design the supercavitating objects shape are suggested. They allow to calculate wall-supercavity boundary clearances, parameters of the wall supercavitation and spray flows. Improved methodic of the investigation of a body of revolution gliding in the cavern process is allowed to determine the correlation between a lifting force coefficient, attack angle, immersion depth of a tail edge and the rate of diameters of the body of revolution and supercavity