ON FINITE LENGTH CAVITIES BENEATH A FREE SURFACE

Abstract

The two-dimensional flow under a free surface with non-zero cavitation number is considered using a "point drag" cavity model. The drag coefficients obtained in closed form as a function of the cavitation number and the curvature at the cavity end (or nose), but not explicitly of the depth. The thickness-length ratio of the cavity is calculated numerically and compared with the case of an elliptic cylinder under a free surface. The three-dimensional effect on the cavity is also considered by the approximation of the cavity to an ellipsoid. These results should be of use in the estimation of the shape of cavities behind ventilated hydrofoil wings and in the subsequent calculation of downwash.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1962
Accession Number
AD0405679

Entities

People

  • B. Yim

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Aspect Ratio
  • Engineering
  • Equations
  • Flow
  • Froude Number
  • Geometric Forms
  • Geometry
  • Hydrodynamics
  • Hydrofoils
  • Marine Engineering
  • Naval Architecture
  • Navy
  • Ship Model Basins
  • Slender Bodies
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering