Visualization Of Supersonic Flows In Shock Tunnels, Using The Background Oriented Schlieren Technique

Raghunath, Sreekanth, Mee, David J., Roesgen, Thomas and Jacobs, Peter A. (2004). Visualization Of Supersonic Flows In Shock Tunnels, Using The Background Oriented Schlieren Technique. In: 2004 AIAA Australian Aerospace Student Conference, The University of Sydney, Sydney, (). 12 December, 2004.

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Author Raghunath, Sreekanth
Mee, David J.
Roesgen, Thomas
Jacobs, Peter A.
Title of paper Visualization Of Supersonic Flows In Shock Tunnels, Using The Background Oriented Schlieren Technique
Conference name 2004 AIAA Australian Aerospace Student Conference
Conference location The University of Sydney, Sydney
Conference dates 12 December, 2004
Publication Year 2004
Sub-type Fully published paper
Language eng
Abstract/Summary Visualisation of supersonic compressible flows using the Background Oriented Schlieren (BOS) technique is presented. Results from experiments carried out in a reflected shock tunnel with models of a 20-degree semi-vertex angle circular cone and a re-entry body in the test section are presented. This technique 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. Tests were conducted with a Mach 4 conical nozzle, with nozzle supply pressure of 2 MPa and nozzle supply temperature of 2000 K respectively. The images captured during the test were compared using PIV style image processing code. The intensity of light at each point in the processed image was proportional to the density at that point. Qualitative visualization of shock shapes, with images clearly indicating regions of subsonic and supersonic flows was achieved. For the cone, the shock angle measured from the BOS image agreed with theoretical calculations to within 0.5 degrees. Shock standoff distances could be measured from the BOS image for the re-entry body.
Subjects 290201 Aerodynamics
Keyword background oriented schlieren
flow visualization
shock tunnel
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Created: Fri, 23 Dec 2005, 10:00:00 EST by David J Mee on behalf of Library Corporate Services