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Autoignition of n-decane Droplets in the Low-, Intermediate-, and High-temperature Regimes from a Mixture Fraction Viewpoint

Borghesi, G. and Mastorakos, E. (2016) Autoignition of n-decane Droplets in the Low-, Intermediate-, and High-temperature Regimes from a Mixture Fraction Viewpoint. Flow, Turbulence and Combustion, 96 (4). pp. 1107-1121. ISSN 1386-6184. doi:10.1007/s10494-016-9710-0.

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Detailed numerical simulations of isolated n-decane droplets autoignition are presented for different values of the ambient pressure and temperature. The ignition modes considered included single-stage ignition, two-stage ignition and cool-flame ignition. The analysis was conducted from a mixture fraction perspective. Two characteristic chemical time scales were identified for two-stage ignition: one for cool-flame ignition, and another for hot-flame ignition. The appearance and subsequent spatial propagation of a cool flame at lean compositions was found to play an important role in the ignition process, since it created the conditions for activating the high-temperature reactions pathway in regions with locally rich composition. Single-stage ignition was characterized by a single chemical time scale, corresponding to hot-flame ignition. Low-temperature reactions were negligible for this case, and spatial diffusion of heat and chemical species mainly affected the duration of the ignition transient, but not the location in mixture fraction space at which ignition first occurs. Finally, ignition of several cool flames of decreasing strength was observed in the cool-flame ignition case, which eventually lead to a plateau in the maximum gas-phase temperature. The first cool flame ignited in a region where the fuel / air mixture was locally lean, whereas ignition of the remaining cool flames occurred at rich mixture compositions.

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Additional Information:© 2016 Springer Science+Business Media Dordrecht. Received: 15 October 2015; Accepted: 12 January 2016; Published online: 21 January 2016.
Subject Keywords:Droplet autoignition; Detailed chemistry; n-decane
Issue or Number:4
Record Number:CaltechAUTHORS:20160202-090752317
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Official Citation:Borghesi, G. & Mastorakos, E. Flow Turbulence Combust (2016) 96: 1107. doi:10.1007/s10494-016-9710-0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64152
Deposited By: Tony Diaz
Deposited On:02 Feb 2016 22:53
Last Modified:10 Nov 2021 23:26

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