THE DESIGN OF TWO DIMENSIONAL LOW DRAG, BASEVENTED STRUTS

Abstract

Linearized cavity flow theory is used to determine the shape and drag of a series of base-vented strut sections having a prescribed chordwise pressure distribution. Stagnation pressure at the nose of the strut is generated by two methods: a flat plate normal to the flow at zero cavitation number, and a parabolic-type nose singularity. The chordwise pressure distributions were specified in the equivalent airfoil plane to be either in the form of a sine series or a symmetrical flat roof top. Numerical calculations were carried out for a series of struts derived by combining the various perturbation flows with the two types of stagnation regions to determine the strut shape, section modulus, minimum pressure coefficient and cavity drag coefficient. Comparison of experimental and theoretical results and the effects of finite base cavitation number and frictional resistance are discussed. Charts for determining the coordinates of the optimum strut for a given design problem are presented.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1962
Accession Number
AD0274057

Entities

People

  • S. E. Starley
  • V. E. Johnson Jr.

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Aspect Ratio
  • Boundary Layer
  • Drag
  • Experimental Data
  • Fourier Series
  • Friction
  • Froude Number
  • Hydrodynamics
  • Leading Edges
  • Low Drag
  • Marine Engineering
  • Navy
  • Pressure Distribution
  • Pressure Measurement
  • Three Dimensional
  • Two Dimensional

Readers

  • Aerodynamics.
  • Fluid Dynamics.
  • Marine Propulsion Engineering and Naval Architecture