Accession Number : AD0718816

Title :   The Wall Effect for Unsteady, Choked Supercavitating Flow,

Corporate Author : CALIFORNIA INST OF TECH PASADENA DIV OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Kim,Jong H.

Report Date : JAN 1971

Pagination or Media Count : 56

Abstract : A linear theory for the two-dimensional supercavitating flow past a flat hydrofoil heaving and pitching with small amplitudes in a choked tunnel is developed using the acceleration potential. It is supposed that the streamlines of the cavity always spring from the leading and the trailing edges of the foil and that the foil is inclined at a small angle to the oncoming flow. Also the pressure in the cavity is assumed to be constant. Force and moment coefficients are calculated as functions of reduced frequency and the ratio of tunnel height to chord length. The pressure disturbances caused by the unsteady motion in a tunnel studied far upstream; these are seen to depend on the chord-tunnel height ratio and reduced frequency. (Author)

Descriptors :   (*HYDROFOILS, TWO DIMENSIONAL FLOW), (*CAVITATION, THEORY), WALLS, LEADING EDGES, TRAILING EDGE, ANGLE OF ATTACK, PRESSURE, HYDRODYNAMICS, MATHEMATICAL MODELS, LINEAR SYSTEMS, EQUATIONS OF MOTION, FLAT PLATE MODELS, BOUNDARY VALUE PROBLEMS, WATER TUNNELS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE