THE SHAPE OF CAVITIES IN SUPERCAVITATING FLOWS,

Abstract

The shape of cavities in two-dimensional, steady supercavitating flows is discussed. Some new finite cavity models are described; these models feature cavity termination in spiral vortices followed by trailing wakes whose thickness is proportionate to the drag coefficient of the forebody. Linearized theory, together with point forebodies, is used to derive simple relations between drag, cavitation number and cavity length. The case of a dragless forebody is also considered and the cavity length is shown to depend upon the second moment of the distributed drag. The influence of both longitudinal and transverse gravity fields on the flow past a body producing drag is discussed. It is shown that in all cases the cavity is caused to be finite. In the case of the transverse field, the cavity is shown to be of a length which corresponds to a Froude number, and it is deflected over its mid-part in the same direction in which gravity acts. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1965
Accession Number
AD0615131

Entities

People

  • Marshall P. Tulin

Tags

DTIC Thesaurus Topics

  • Applied Mechanics
  • Cavitation
  • Coefficients
  • Congress
  • Froude Number
  • Geometry
  • Mathematics
  • Mechanics
  • Physical Properties
  • Physics
  • Thickness
  • Transverse
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Mechanics and Fluid Dynamics.
  • Marine Propulsion Engineering and Naval Architecture