Direct numerical simulations of turbulent flame expansion in fine sprays

Wandel, Andrew P. and Chakraborty, Nilanjan and Mastorakos, E. (2009) Direct numerical simulations of turbulent flame expansion in fine sprays. Proceedings of the Combustion Institute, 32 (2). pp. 2283-2290. ISSN 1540-7489

Abstract

Direct numerical simulations of expanding flame kernels following localized ignition in decaying turbulence with the fuel in the form of a fine mist have been performed to identify the effects of the spray parameters on the possibility of self-sustained combustion. Simulations show that the flame kernel may quench due to fuel starvation in the gaseous phase if the droplets are large or if their number is insufficient to result in significant heat release to allow for self-sustained flame propagation for the given turbulent environment. The reaction proceeds in a large range of equivalence ratios due to the random location of the droplets relative to the igniter location that causes a wide range of mixture fractions to develop through pre-evaporation in the unreacted gas and through evaporation in the preheat zone of the propagating flame. The resulting flame exhibits both premixed and non-premixed characteristics.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Awaiting Authors' Accepted Version, which may be deposited in accordance with the copyright policy of the publisher.
Depositing User: Dr Andrew Wandel
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 27 Jun 2010 07:49
Last Modified: 01 Sep 2014 02:56
Uncontrolled Keywords: direct numerical simulations; droplets; sprays; spark ignition
Fields of Research (FOR2008): 09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
09 Engineering > 0915 Interdisciplinary Engineering > 091501 Computational Fluid Dynamics
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi: 10.1016/j.proci.2008.06.102
URI: http://eprints.usq.edu.au/id/eprint/6417

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