High-Speed Schlieren and 10-Hz Kr PLIF for the new AFRL Mach-6 Ludwieg Tube Hypersonic Wind Tunnel

Abstract

Flow visualization measurement techniques, namely high-speed schlieren and two-photon Kr planar laser-induced fluorescence (PLIF at 10-Hz repetition rate), were developed and implemented in a new AFRL Mach-6 Ludwieg Tube Hypersonic Wind Tunnel. Because of its high frame rates, the schlieren technique was first employed to image the starting shock and the entire startup process. These schlieren images also helped interpret the pressure measurements during the startup process and characterize the tunnel noise for boundary-layer transition experiments. Next, both schlieren and Kr PLIF were employed to image the bow shock from a large blunt cone at Po = 1.38 MPa, and the measured bow shock shapes from both techniques were compared to CFD calculations employing the US3D simulation code.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2017
Accession Number
AD1042096

Entities

People

  • Campbell D. Carter
  • Joshua D. Pickles
  • King-yiu Lam
  • Roger L. Kimmel
  • Venkateswaran Narayanaswamy

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Boundary Layer Transition
  • Bow Shock
  • Computational Fluid Dynamics
  • Dye Lasers
  • Flow Visualization
  • Fluid Dynamics
  • Hypersonic Wind Tunnels
  • Laser Beams
  • Laser Induced Fluorescence
  • Lasers
  • Light Sources
  • Pressure Measurement
  • Repetition Rate
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Fluid Mechanics and Fluid Dynamics.
  • Molecular Photonics/Laser Physics

Technology Areas

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