Laser Doppler Velocimeter Application in Supersonic Boundary-Layer Flow

Abstract

Laser Doppler velocimeter techniques have been investigated for nonintrusive measurements of cone boundary-layer mean-velocity profiles in supersonic flow. The investigation was performed in the AEDC Supersonic Wind Tunnel (A) at a free-stream Mach number of 4, using olive-oil droplets to seed the tunnel flow. The basis for the evaluation of the LDV results was a set of velocity profiles obtained using conventional probing techniques. Laminar, transitional, and turbulent boundary layers on a 7-deg (half-angle) sharp-cone model were included in this study. The results obtained in this investigation demonstrate that mean-velocity profiles can be obtained within acceptable limits of uncertainty provided (1) seed particles of appropriate size are found in tunnel flow or can be added to the flow and (2) a systematic editing procedure is available, when the results are evaluated, to eliminate velocities of relatively low probability and effects of spurious noise.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1987
Accession Number
ADA178395

Entities

People

  • J. C. Donaldson

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Acquisition
  • Air Force
  • Boundary Layer
  • Boundary Layer Flow
  • Data Acquisition
  • Flow Fields
  • Free Stream
  • Laminar Boundary Layer
  • Mach Number
  • Measurement
  • Particle Size
  • Supersonic Wind Tunnels
  • Test And Evaluation
  • Test Facilities
  • Turbulent Boundary Layer
  • Velocimeters
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.

Technology Areas

  • Directed Energy
  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers
  • Hypersonics - Hypersonic Flow