Accession Number:

AD0478354

Title:

EXPERIMENTAL STUDY OF THE EFFECT OF A GAP CLEARANCE ON THE PERFORMANCE OF A FULLY CAVITATING FLAT PLATE WITH AND WITHOUT A FLAP.

Descriptive Note:

Final rept.,

Corporate Author:

CALIFORNIA INST OF TECH PASADENA HYDRODYNAMICS LAB

Personal Author(s):

• Wade,Richard B.

Report Date:

1965-11-01

Pagination or Media Count:

26.0

Abstract:

Experimental results are presented for the effect of a hinge gap on a fully cavitating performance of a flat plate hydrofoil without and with a flap. From the results of the tests it is concluded that for the zero flap deflection, no significant effects of the gap are apparent for range of the parameters investigated. However, for a 20 flap-to-chord ratio and a 20 deg. flap deflection a significant drop occurs in the lift and moment coefficients for a given gap ratio. This effect increases with increase in gap width. The drag on the other hand is unaffected for the range of values tested. Certain qualitative effects of the jet, arising from the gap, on the cavity appearance are discussed. Comparison of the experimental results for zero gap, with established non-linear theories, show very good agreement. Author

Descriptors:

• *FLAPS(CONTROL SURFACES)
• *HYDROFOILS
• FLUID MECHANICS
• EXPERIMENTAL DATA
• CONTROL SYSTEMS
• WATER TUNNELS
• MATHEMATICAL MODELS
• TEST METHODS
• PERFORMANCE(HUMAN)
• PERFORMANCE(ENGINEERING)
• CAVITATION
• FLAT PLATE MODELS
• HYDRODYNAMIC CONFIGURATIONS

Subject Categories:

• Marine Engineering
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE