EFFECT OF SURFACE ROUGHNESS ON AXISYMMETRIC LAMINAR SEPARATED FLOWS AT M = 5.4

Abstract

The effect of controlled roughness was studied on a flared ogive cylinder at M = 5.3, with emphasis on three-dimensional perturbations at reattachment, by employing pitot pressure surveys and sublimation techniques. Cylindrical roughness elements of slightly less than the boundary layer thickness were used. Protuberances of this size were found not to contaminate the laminar reattachment compared to a model free of roughness. The results indicated that weak disturbances upstream of separation became amplified in the free shear layer and produced significant spanwise pitot pressure fluctuations at reattachment. Results of a systematic investigation of the effects of roughness height, diameter and spacing are presented.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1968
Accession Number
AD0674003

Entities

People

  • J. J. Ginoux
  • W. C. Schnell

Organizations

  • von Kármán Institute for Fluid Dynamics

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Diameters
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Heat Transfer
  • Insensitive Explosives
  • Layers
  • Mach Number
  • Measurement
  • Pressure Distribution
  • Pressure Measurement
  • Reynolds Number
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster