Measurement of shock wave unsteadiness using a high-speed schlieren system and digital image processing

Estruch, D.; Lawson, N. J.; MacManus, D. G.; Garry, K. P.; Stollery, J. L.
December 2008
Review of Scientific Instruments;Dec2008, Vol. 79 Issue 12, p126108
Academic Journal
A new method to measure shock wave unsteadiness is presented. Time-resolved visualizations of the flow field under investigation are obtained using a high-speed schlieren optical system and the motion of the shock wave is determined by means of digital image processing. Information on the shock’s unsteadiness is subsequently derived with Fourier analysis. A sample study on shock unsteadiness in a shock-wave/turbulent boundary-layer interaction with separation is included. The method presented enables a measure of shock unsteadiness at locations in the imaged flow field not accessible by intrusive methods.


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