Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 79, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3053361
Keywords
boundary layer turbulence; flow instability; flow separation; flow visualisation; high-speed optical techniques; image processing; optical information processing; schlieren systems; shock wave effects
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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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