Axisymmetric Bluff-Body Drag Reduction through Geometrical Modifications,

Abstract

The effect of shoulder radiusing and grooving (longitudinally or circumferentially) the afterbodies of bluff bodies to reduce the base drag at low speeds is discussed. Shoulder radii as large as 2.75 body diameters are examined. Reynolds number based on body diameter varied from 20,000 to 200,000. Results indicate that increasing the shoulder radius to 2.75 body diameters can reduce the drag levels to those of a streamline body having 67 percent greater fineness ratio. For the relatively sharp shoulder case, body drag reductions as large as 50% are obtained using circumferential or longitudinal grooves. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1984
Accession Number
ADP004791

Entities

People

  • F. G. Howard
  • W. L. Goodman

Organizations

  • National Aeronautics and Space Administration

Tags

DTIC Thesaurus Topics

  • Air Force
  • Arm Bones
  • Bodies
  • Diameters
  • Drag
  • Drag Reduction
  • Fineness Ratio
  • Flow Fields
  • Reynolds Number
  • Shoulder

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Mechanics and Fluid Dynamics.