Experimental and Theoretical Studies of the Effect of Gas Content on Unsteady Cavity Flows.

Abstract

A partially cavitating two-dimensional hydrofoil was oscillated in pitch while air was bled into the cavity at a controlled rate. By varying the ambient pressure and air flow rate simultaneously, a constant ventilation number was maintained for a series of cavity air partial pressures. Unsteady forces and cavity pressures were measured, and photographs taken. It was found that cavity air caused fluctuating cavity pressures, and tended to stabilize cavity length. Its effect on force coefficients was relatively modest. These trends were also found from a parallel theoretical investigation in which a computer program which predicts unsteady cavitation of 2-D foils was modified to allow for cavity gas. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1982
Accession Number
ADA119800

Entities

People

  • H. Clayton Sayre
  • Robert J. Van Houten

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Acquisition
  • Air Pressure
  • Boundary Layer
  • Computers
  • Data Acquisition
  • Data Reduction
  • Engineering
  • Flow Rate
  • Hydrodynamics
  • Measurement
  • Pressure Distribution
  • Pressure Measurement
  • Resonant Frequency
  • Static Pressure
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Fluid Mechanics and Fluid Dynamics.
  • Marine Propulsion Engineering and Naval Architecture