Accession Number : AD0827202

Title :   A THEORETICAL STUDY OF THE FORCE AND MOMENT ON AN OSCILLATING SUPERCAVITATED HYDROFOIL NEAR A FREE SURFACE.

Descriptive Note : Final rept. Dec 66-Nov 67,

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO NY

Personal Author(s) : Tung, Chee ; Statler, Irving C.

Report Date : NOV 1967

Pagination or Media Count : 117

Abstract : The approach assumes linearized, two-dimensional, potential flow but no further limitations are placed on the values of Froude number, cavitation number, or depth-to-chord ratio. Account is taken of the effect of gravity on both the air-water interface and the cavity surface. The report discusses the approach to the general problem which is based on a representation of the system by distributions of elemental singularities and on a double linearization procedure. The latter feature separates the problem into a quasi-steady and an unsteady part in which the governing equations of the unsteady problem depend on the solutions to the quasi-steady problem. The quasi-steady solution is obtained for a supercavitated, flat-plate foil near a free surface taking account of the effects of gravity. Results for the limiting case of steady motion are compared with other theories and with experimental data. (Author)

Descriptors :   (*HYDROFOILS, TWO DIMENSIONAL FLOW), CAVITATION, SURFACE PROPERTIES, FORCE(MECHANICS), MOMENTS, OSCILLATION, LEADING EDGES, GRAVITY, LIFT, INTERFACES, FLAT PLATE MODELS, HYDRODYNAMICS, THEORY.

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE