Background oriented schlieren for flow visualisation in hypersonic impulse facilities

Ramanah, D., Raghunath, S., Mee, D. J., Rosgen, T. and Jacobs, P. A. (2007) Background oriented schlieren for flow visualisation in hypersonic impulse facilities. Shock Waves, 17 1-2: 65-70. doi:10.1007/s00193-007-0097-7

Author Ramanah, D.
Raghunath, S.
Mee, D. J.
Rosgen, T.
Jacobs, P. A.
Title Background oriented schlieren for flow visualisation in hypersonic impulse facilities
Journal name Shock Waves   Check publisher's open access policy
ISSN 0938-1287
Publication date 2007
Sub-type Article (original research)
DOI 10.1007/s00193-007-0097-7
Volume 17
Issue 1-2
Start page 65
End page 70
Total pages 6
Editor Takayama, K.
Place of publication New York
Publisher Springer
Collection year 2008
Language eng
Subject 290500 Mechanical and Industrial Engineering
780102 Physical sciences
Abstract Experiments to demonstrate the use of the background-oriented schlieren (BOS) technique in hypersonic impulse facilities are reported. BOS uses a simple optical set-up consisting of a structured background pattern, an electronic camera with a high shutter speed and a high intensity light source. The visualization technique is demonstrated in a small reflected shock tunnel with a Mach 4 conical nozzle, nozzle supply pressure of 2.2 MPa and nozzle supply enthalpy of 1.8 MJ/kg. A 20 degrees sharp circular cone and a model of the MUSES-C re-entry body were tested. Images captured were processed using PIV-style image analysis to visualize variations in the density field. The shock angle on the cone measured from the BOS images agreed with theoretical calculations to within 0.5 degrees. Shock standoff distances could be measured from the BOS image for the re-entry body. Preliminary experiments are also reported in higher enthalpy facilities where flow luminosity can interfere with imaging of the background pattern.
Keyword Mechanics
background schlieren
shock tunnel
flow visualization
Q-Index Code C1

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Created: Mon, 18 Feb 2008, 14:44:03 EST