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Non-premixed hydrocarbon ignition at high strain rates

Egolfopoulos, Fokion N. and Dimotakis, Paul E. (1998) Non-premixed hydrocarbon ignition at high strain rates. Symposium (International) on Combustion, 27 (1). pp. 641-648. ISSN 0082-0784. doi:10.1016/S0082-0784(98)80456-6.

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We report on the results of numerical-simulation investigations of ignition characteristics of hydrocarbon-fuel blends expected from thermal cracking of typical jet fuels, at conditions relevant to high-Mach-number, air-breathing propulsion. A two-point-continuation method was employed, with a detailed description of molecular transport and chemical kinetics, focusing on the effects of fuel composition, reactant temperature, additives, and imposed strain rate. It captured the entire S-curve that describes the processes of vigorous burning extinction, and ignition. The results demonstrate that ignition of such fuel blends is dominated by the synergistic behavior of CH_4 and C_2H_4. A fuel temperature of T_(fuel)=950 K was employed throughout. At higher air temperatures (T_(air)=1200 K), addition of small amounts of CH_4 to C_2H_4 molerately inhibits C_2H_4 ignition, while at lower T_(air)=1050 K, CH_4 promotes ignition. Large amounts of CH_4, however, inhibit C_2H_4 ignition at all T_(air)s. Ignition promotion was also investigated through the independent addtion of H_2 and F_2 in the reactant streams. H_2 addition (e.g., 2–10%) produces a two-stage ignition and sustains higher ignition strain rates. Small amounts of F_2 (1%) result in F-radical production, contributing to efficient fuel consumption, enhancing ignition characteristics. Ignition strain rates of σign≅4000 s^(−1), as compared to σ_(ign) ≅ 250 s^(−1) for pure C_2H_4, can be attained with such additives at lower temperatures (T_(air)=1050 K).

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Additional Information:© 1998 The Combustion Institute. This study was funded by the Air Force Office of Scientific Research, Air-Breathing Propulsion Program, under Grants F49620-94-1-0353 and F49620-98-1-0052, whose support is gratefully acknowledged. The authors would also bke to acknowledge the suggestion by an anonymous referee to consider the extensions (Ref. [141) to GRI 2.1, utilized in this study.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620-94-1-0353
Air Force Office of Scientific Research (AFOSR)F49620-98-1-0052
Issue or Number:1
Record Number:CaltechAUTHORS:20160602-183737190
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Official Citation:Fokion N. Egolfopoulos, Paul E. Dimotakis, Twenty-Seventh Sysposium (International) on Combustion Volume OneNon-premixed hydrocarbon ignition at high strain rates, Symposium (International) on Combustion, Volume 27, Issue 1, 1998, Pages 641-648, ISSN 0082-0784, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67630
Deposited By: Paul Dimotakis
Deposited On:03 Jun 2016 21:19
Last Modified:11 Nov 2021 03:51

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