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Proceedings Paper

The effect of wedge position and inlet geometry on shock wave reflection
Author(s): R. E. Hall; N. P. da Silva; B. W. Skews; R. T. Paton
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Paper Abstract

Experiments were conducted in a shock tube to determine the effect of planar wedge inlet geometry on the shock wave reflection pattern that occurred on a wedge. High-speed schlieren imaging was used to visualize the experiments conducted in air with a nominal incident shock strength of Mach 1.31. The experimental test pieces consisted of a wedge mounted above the floor of the shock tube where the underside wedge angle was varied. The upper wedge angle was fixed at 30°, resulting in a Mach reflection. The underside wedge angle was either 30° or 90°, corresponding to a conventional and blunt wedge respectively. For the cases presented here, the reflected shock from the initial interaction reflects off of the shock tube floor and diffracts around the wedge apex. A density gradient is formed at the wedge apex due to this process and results in a vortex being shed for the 90° wedge. It was shown by simple measurements that the diffracted wave could reach the triple point of the upper Mach reflection if the wedge were of sufficient length.

Paper Details

Date Published: 20 February 2017
PDF: 6 pages
Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 103281G (20 February 2017); doi: 10.1117/12.2269003
Show Author Affiliations
R. E. Hall, Univ. of the Witwatersrand (South Africa)
N. P. da Silva, Univ. of the Witwatersrand (South Africa)
B. W. Skews, Univ. of the Witwatersrand (South Africa)
R. T. Paton, Univ. of the Witwatersrand (South Africa)

Published in SPIE Proceedings Vol. 10328:
Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics
T. Goji Etoh; Hiroyuki Shiraga, Editor(s)

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