A Flow Model for the Effect of A Slanted Base on Drag.

Abstract

Experiments by Morel have shown that slanting the base of a bluff body causes large variations in the drag, as the slant angle changes. For a particular, critical slant angle the drag changes discontinuously. This phenomenon was correlated with a drastic change in the type of base flow. A mechanism to explain this change, and therefore, the discontinuity in drag, is proposed. The basis of the mechanism is breakdown of the side edge vortices. An estimate of the swirl angle in these vortices is obtained using a swept-back mixing zone solution. This swirl angle and the other elements of the theory provide an estimate for the critical slant angle that is entirely consistent with the observed value. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1981
Accession Number
ADA104033

Entities

People

  • Raymond Sedney

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Aircrafts
  • Base Flow
  • Boundary Layer
  • Computational Fluid Dynamics
  • Engineering
  • Flow
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Free Stream
  • Jet Propulsion
  • Mechanics
  • Physics
  • Physics Laboratories
  • Turbulent Mixing
  • Wind Tunnels

Readers

  • Aerodynamics/Aeronautics.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Fluid Mechanics and Fluid Dynamics.