SUPERCAVITATING FLAT-PLATE WITH AN OSCILLATING FLAP AT ZERO CAVITATION NUMBER,

Abstract

The results of experimental and theoretical investigations on a supercavitating flat-plate with an oscillating flap at zero cavitation number are presented. The experiment was carried out in a vertical free-jet water tunnel using 3 in. chord and 2 in. chord flat-plate hydrofoils, both having flap-chord ratios of 0.29. Various relative locations of the free surfaces were used and the reduced frequency range of zero to four was covered. Amplitude and phase angle of lift, drag, and moment as well as the surface wave speed were measured. The problem was also solved analytically by means of a first order perturbation theory using complex acceleration potenital. Numerical values were obtained for the cases of inifinite fluid, symmetrical jet, and zero spray thickness using three flap-chord ratios (0.25, 0.30, 0.40). Fairly good agreement between the experimental data and the analytical results was obtained. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1965
Accession Number
AD0630353

Entities

People

  • C. S. Song

Tags

DTIC Thesaurus Topics

  • Agreements
  • Amplitude
  • Cavitation
  • Experimental Data
  • Frequency
  • Frequency Shift
  • Hydrofoils
  • Perturbation Theory
  • Perturbations
  • Surface Waves
  • Thickness
  • Tunnels
  • Water Tunnels
  • Waves

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Marine Propulsion Engineering and Naval Architecture