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Performance of Supercavitating Hydrofoils with Flaps, with Special Reference to Leakage and Optimization of Flap Design
Oba, R. (St. Anthony Falls Hydraulic Laboratory, 1965)
 

Title 
Performance of Supercavitating Hydrofoils with Flaps, with Special Reference to Leakage and Optimization of Flap Design

Author(s)

Issue Date
1965-05

Publisher
St. Anthony Falls Hydraulic Laboratory

Type
Working Paper

Abstract
A modified linearized theory was developed for supercavitating, flapped foils of arbitrary form in which effects of fluid leakage through the flap hinge were considered. It was found that the performance at conditions other than design conditions was improved with the use of trailing edge flaps. The drag-lift ratio may be reduced by a factor of 1/2 to 1/3. The foil performance is dependent on the flap-chord ratio, e, and the flap deflection, performance increasing with small e. Effects produced by leakage through the flap hinge were significant in their influence on velocity distribution and flap effectiveness (increment in lift coefficient per unit change in flap angle). The effect of hinge leakage on the overall performance, i. e., lift, drag, and moment, was small and may be neglected in most cases.

Appears in Collection(s)

Series/Report Number
Technical Paper Series B
51

Description
Contract Nonr 710(24), Task NR 0652-052

Suggested Citation
Oba, R.. (1965). Performance of Supercavitating Hydrofoils with Flaps, with Special Reference to Leakage and Optimization of Flap Design. St. Anthony Falls Hydraulic Laboratory. Retrieved from the University of Minnesota Digital Conservancy, http://purl.umn.edu/108062.


Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.