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Proceedings Paper

Schlieren observations of flame acceleration as precursors of transition to detonation
Author(s): Geraint Thomas; Richard Bambrey
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Paper Abstract

Deflagration to detonation transition (DDT) is a phenomenon that is difficult to observe experimentally because of the inherent stochastic nature of shock and flame acceleration processes that produce the thermodynamic and gasdynamic conditions required for DDT. The shock tube however provides an attractive means of establishing or modifying these conditions independently of chemical reactivity parameters. In the present paper results are presented from an experimental study of turbulent flame acceleration and eventual transition to detonation following the perturbation of a curved reaction front (spheroidal flame bubble) by a shock wave. Of particular interest is how an initial flame kernel, propagating with a laminar burning velocity of few meters per second or less, can be enhanced by shock processes to the point where a transition to detonation occurs, without the influence of turbulence producing obstacles. This is compared with a more conventional flow, but again generated by a shock wave, through a grid scenario where the flame propagated into a pre-established turbulent field. The events were recorded using spark Schlieren photography as the primary diagnostic technique.

Paper Details

Date Published: 17 April 2001
PDF: 9 pages
Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); doi: 10.1117/12.424355
Show Author Affiliations
Geraint Thomas, Univ. of Wales/Aberystwyth (United Kingdom)
Richard Bambrey, Univ. of Wales/Aberystwyth (United Kingdom)

Published in SPIE Proceedings Vol. 4183:
24th International Congress on High-Speed Photography and Photonics
Kazuyoshi Takayama; Tsutomo Saito; Harald Kleine; Eugene V. Timofeev, Editor(s)

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