LINEARIZED THEORY FOR THIN, SUPERCAVITATING HYDROFOILS WITH SPOILER-FLAPS OPERATING AT HIGH SPEEDS BENEATH A FREE SURFACE
Abstract
The linearized problem of flow past a flat plate with a deflected upper flap is solved including the free surface effects. The flow is assumed to detach at the trailing edges of the flap and of the plate leaving an infinite cavity of constant pressure behind. The results are applicable to flaps of arbitrary length, hinged at arbitrary distance from the leading edge and at arbitrary depth. Numerical results are presented to show the effect of depth on the lift and drag coefficients of a trailing edge flap whose chord is 30% of the chord of the plate, the effect of the hinge position of such a flap on the hydrodynamic characteristics of a plate at infinite depth, and the pressure distribution on a flapped plate at infinite depth. The principal results obtained are: as the depth decreases, the flap becomes less effective and less efficient; as the hinge position is moved rearward, the flap becomes more effective and more efficient. (Autho)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 09, 1961
- Accession Number
- AD0259303
Entities
People
- C.f. Chen