Accession Number : ADP003817

Title :   Experimental Determination of Low Froude Number Hydrofoil Performance in Calm Water and in Regular Waves,

Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD

Personal Author(s) : Wilson,M. B.

Report Date : AUG 1983

Pagination or Media Count : 59

Abstract : Results of experimental investigations are presented for the steady and unsteady hydrodynamic force performance of an aspect ratio 6, NACA 64A010 foil section, plain-flapped, rectangular planform hydrofoil. The forward-leading sting-supported foil model was operated in calm water in the speed range of chord Froude numbers varying from 1.22 to 4.23 at five depth-to-chord ratios. It was run under regular head waves at Froude numbers varying from 1.22 to 3.67 at three depth-to-chord ratios, in a systematic series of wave lengths and amplitudes. These data cover an important low Froude number speed regime. For both the calm water (steady) and the unsteady cases, comparisons are provided between the experimental results and analytical predictions. It is shown that at low Froude numbers there is a trend toward exaggerated level of both steady and unsteady hydrodynamic forces on a hydrofoil. (Author)

Descriptors :   *Hydrofoils, Hydrodynamic characteristics, Aspect ratio, Model tests, Loads(Forces), Water waves, Head on orientation, Amplitude, Frequency, Steady flow, Unsteady flow

Distribution Statement : APPROVED FOR PUBLIC RELEASE