Supercavities in Compressible Fluid

The basic results obtained by the author in the theory of supercavities in compressible fluid have been presented. Some peculiarities of the theoretical methods application for the supersonic flows and their difference from the analogous flows in air have been noted. The basic correlations for the shock waves in the water are considered. Axissymetric supercavities in sub- and supersonic compressible fluid have been researched using the asymptotic method. An integro-differential equation for the cavity profile was deduced. The outer solution was found and for the thin cone-cavitators the solution was obtained for the whole area of the flow. Based of the modem numerical methods the algorithm calculation of axisymmetric cavities in sub- and supersonic compressible fluid flow has been worked out. The results of calculation of axysimmetric supercavities downstream of a disk within the range of the Mach numbers 0 - M - 1.4 have been represented. As a result of the analysis for the different Mach numbers the following was defined: the cavitation number, the cavitation drag ratio, the mid-section radius, the cavity shape, the distance of shock wave from a disk (for supersonic flow). The conical flows in a supersonic water stream have been calculated by the numerical method. The results obtained by the author have been compared with the known experimental and theoretical results of other investigations. --Original contains color plates: All DTIC reproductions will be in black and white. Presented at the Applied Vehicle Technology Panel (AVT) in support of a VKI Lecture Series presented from 12-16 February 2001, at the von Karman Institute in Brussels, Belgium. ISBN 92-837-1074-6. RTO Lecture Series 005. p16-1/16-29 This article is from ADA400728 Supercavitating Flows (les Ecoulements supercavitants)