Measurement of shock wave unsteadiness using a high-speed schlieren system and digital image processing.
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.
Estruch
D
D
Department of Aerospace Sciences, Cranfield University, Cranfield, Bedfordshire MK43 0AL, United Kingdom.
Lawson
N J
NJ
MacManus
D G
DG
Garry
K P
KP
Stollery
J L
JL