TESTS OF A CAVITATING HYDROFOIL

Abstract

A dynamometer capable of measuring the force and moment characteristics of a hydrofoil in cavitating flow was developed. The system is convenient for measuring lift and moment, but troublesome for measuring drag because of the sensitivity of the drag calibration to the ambient pressure in the water tunnel. There is a large discrepancy between cavitation numbers based upon vapor and cavity pressures and it is important that the latter be used in order to obtain correct results. A serious difficulty in interpreting the results of tests on cavitating hydrofoils in a water tunnel so as to apply to a hydrofoil in a fred stream is the effect of the tunnel walls on the cavitating flow. Attempts were made to correct approximately for this effect by using cavitation numbers based on pressures at the downstream end of the test section rather than at its upstream end. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1961
Accession Number
AD0262739

Entities

Organizations

  • University of Iowa

Tags

DTIC Thesaurus Topics

  • Calibration
  • Cavitation
  • Dynamometers
  • Hydrofoils
  • Measurement
  • Measuring Instruments
  • Sensitivity
  • Tunnels
  • Water Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Marine Propulsion Engineering and Naval Architecture
  • Systems Analysis and Design