Background oriented schlieren for flow visualisation in hypersonic impulse facilities
First Online: 21 July 2007 Received: 24 January 2006 Revised: 18 May 2007 Accepted: 30 May 2007 DOI:
Cite this article as: Ramanah, D., Raghunath, S., Mee, D.J. et al. Shock Waves (2007) 17: 65. doi:10.1007/s00193-007-0097-7 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° 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°. 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.
Keywords Background schlieren Shock tunnel Flow visualization
A version of this paper was presented at the 25th International Symposium on Shock Waves in Bangalore in July 2005.
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