EXPERIMENTAL INVESTIGATIONS OF SUPERCAVITATING HYDROFOILS WITH FLAPS,
Abstract
This report presents smooth-water towing basin test data for two zero-dihedral supercavitating hydrofoils of aspect ratio 3.0, mounted by a single center strut and fitted with various sizes of split trailing-edge flaps. Measurements were made of hydrofoil and flap forces and moments over a wide coverage of parameters. The near-optimum flap size for a modified Tulin twoterm foil giving maximum foil lift is shown to be flap chord equal to 3/10 of foil chord and flap span equal to 9/10 of foil span. Pressure mapping of the foil lower surface indicates that lower surface lift coefficients are essentially independent of speed, and that more than 50% of the foil lift comes from the upper surface for cavities which are only partially fed with atmospheric air. Data extrapolated to a cavitation number of zero are shown to agree with theory by Johnson, extended by Lin to cover the case with flaps. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1963
- Accession Number
- AD0432457
Entities
People
- A. C. Conolly
Organizations
- General Dynamics