Accession Number:

AD0262739

Title:

TESTS OF A CAVITATING HYDROFOIL

Descriptive Note:

Corporate Author:

IOWA UNIV IOWA CITY INST OF HYDRAULIC RESEARCH

Personal Author(s):

Report Date:

1961-07-01

Pagination or Media Count:

1.0

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE