Accession Number:

AD0601908

Title:

NON-STEADY HYDRODYNAMIC CHARACTERISTICS OF A SUPERCAVITATING HYDROFOIL UNDER A FREE SURFACE,

Descriptive Note:

Corporate Author:

HYDRONAUTICS INC LAUREL MD

Personal Author(s):

Report Date:

1964-04-01

Pagination or Media Count:

52.0

Abstract:

The present report is a sequel to an earlier report AD-601 100. The principal interest here is to clarify, both qualitatively and quantitatively, the influence of a free surface on the non-steady two-dimensional hydrodynamic characteristics of supercavitating hydrofoils. Heaving, pitching, and flapping motions are considered. It is found that, in general, the added mass forces and moments depend only slightly on the submergence depthchord ratio of the hydrofoil. However, the other non-steady forces and moments vary appreciably with the depth of submersion. At a depth-chord ratio of unity typical value the non-steady characteristics are not well approximated by either the deeply submerged or surfaced hydrofoil results. The prediction of hydrofoil flutter or of transient foil or flap response will thus depend very much on the hydrofoil submergence. Detailed numerical results for unsteady response, based on digital machine calculation, are given. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE