A FREE STREAMLINE THEORY OF FLOWS ABOUT A FLAT PLATE WITH A FLAP AT ZERO CAVITATION NUMBER

Abstract

The free streamline theory is applied to a uniform flow past a flat plate with a flap at infinite depth and at zero cavitation number. The solution is carried out on the basis of the exact (non-linear) boundary conditions on the free streamlines about the cavity. By LeviCivita's method, lift and drag coefficients can be found readily. Numerical results for the lift and drag coefficients are obtained for a number of cases with different combinations ofANGLES OF INCIDENCE, FLAP ANGLES AND FLAP-TOCHORD RATIONS. Johnson's approximate method of finding non-linear lift and drag coefficients for cambered hydrofoils is extended to the flap problem and satisfactory agreement is obtained with the exact theory for the infinite depth case (within the practical range of angles of incidence and flap angles). In the absence of exact theory for finite depths, the application of Johnson's method is suggested and herein discussed. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1961
Accession Number
AD0270508

Entities

People

  • J.d. Lin

Tags

DTIC Thesaurus Topics

  • Agreements
  • Boundaries
  • Cavitation
  • Coefficients
  • Hydrofoils

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Marine Propulsion Engineering and Naval Architecture