NON-STEADY HYDRODYNAMIC CHARACTERISTICS OF A SUPERCAVITATING HYDROFOIL UNDER A FREE SURFACE,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1964
- Accession Number
- AD0601908
Entities
People
- C. C. Hsu