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