A fresh look at unsteady shock wave reflection using high-speed imaging

Beric W. Skews

doi:10.1117/12.821597

10 February 2009 A fresh look at unsteady shock wave reflection using high-speed imaging

Beric W. Skews

Proceedings Volume 7126, 28th International Congress on High-Speed Imaging and Photonics; 712602 (2009) https://doi.org/10.1117/12.821597
Event: 28th International Congress on High-Speed Imaging and Photonics, 2008, Canberra, Australia

Abstract

It is shown that with the construction of unique experimental facilities together with the use of short-duration and timeresolved digital imaging, a number of aspects regarding shock wave reflection, which are regularly quoted in the literature, are found to be either inexact or even incorrect. Two main issues are addressed here: the first being the experimental resolution of the two von Neumann Paradoxes, and the other the reflection of shock waves off curved surfaces. Neither of these could have been addressed without high-speed imaging. The paradoxes arises from the finding that von Neumann's theory for flow across an oblique shock wave is excellent for describing regular reflection and threeshock patterns for non-weak shocks, but fails for weak shocks and for predicting transition between regular and Mach reflection. Specially constructed rigs, one which magnifies the process ten times and the other which removes the effect of the wall illustrate the reasons for the paradoxes. Recent studies on shock reflection in cavities using a novel flow visualization technique and high-speed time resolved imaging has shown that the shock wave reflection off a curved wall is somewhat different from that described in the literature and which has been extracted from single shot imaging.

Citation Download Citation

Beric W. Skews "A fresh look at unsteady shock wave reflection using high-speed imaging", Proc. SPIE 7126, 28th International Congress on High-Speed Imaging and Photonics, 712602 (10 February 2009); https://doi.org/10.1117/12.821597

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