A spherically expanding flame in a quiescent premixture is a bifurcation phenomenon, in which the flame becomes unstable at a radius, greater than some critical value, while remaining stable below that critical radius. Beyond this critical radius, developing instabilities are initiated by propagating cracks to form a coherent structure covering the entire flame surface and the flame accelerates. The present paper reports a Schlieren photographic study of spherical flame propagation in methane—air, iso-octane—air and -heptane—air premixtures at different initial conditions where the onset of instability and the flame acceleration are clearly perceived. Critical size and corresponding elapsed time for the development of such instability are measured and these values are correlated with the appropriate flame parameter.
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December 2005
This article was originally published in
Journal of Heat Transfer
Technical Briefs
Correlations for the Onset of Instabilities of Spherical Laminar Premixed Flames
M. Z. Haq
M. Z. Haq
(8802) 9665636
(8802) 8613046
Department of Mechanical Engineering,
e-mail: zahurul@me.buet.ac.bd
Bangladesh University of Engineering and Technology
, Dhaka-1000, Bangladesh
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M. Z. Haq
(8802) 9665636
(8802) 8613046
Department of Mechanical Engineering,
Bangladesh University of Engineering and Technology
, Dhaka-1000, Bangladeshe-mail: zahurul@me.buet.ac.bd
J. Heat Transfer. Dec 2005, 127(12): 1410-1415 (6 pages)
Published Online: January 25, 2005
Article history
Received:
April 1, 2004
Revised:
January 25, 2005
Citation
Haq, M. Z. (January 25, 2005). "Correlations for the Onset of Instabilities of Spherical Laminar Premixed Flames." ASME. J. Heat Transfer. December 2005; 127(12): 1410–1415. https://doi.org/10.1115/1.2098867
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