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Ignition by moving hot spheres in H_2-O_2-N_2 environments

Jones, S. and Melguizo-Gavilanes, J. and Shepherd, J. E. (2019) Ignition by moving hot spheres in H_2-O_2-N_2 environments. Proceedings of the Combustion Institute, 37 (2). pp. 1597-1604. ISSN 1540-7489.

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A combined experimental and numerical study was carried out to investigate thermal ignition by millimeter size (d=6 mm) moving hot spheres in H_2-O_2-N_2 environments over a range of equivalence ratios. The mixtures investigated were diluted with N_2 to keep their laminar flame speed constant and comparable to the sphere fall velocity (2.4 m/s) at time of contact with the reactive mixture. The ignition thresholds (and confidence intervals) were found by applying a logistic regression to the data and were observed to increase from lean (Φ=0.39; T_(sphere) = 963 K) to rich (Φ=1.35; T_(sphere) = 1007 K) conditions. Experimental temperature fields of the gas surrounding the hot sphere during an ignition event were, for the first time, extracted using interferometry and compared against simulated fields. Numerical predictions of the ignition thresholds were within 2% of the experimental values and captured the experimentally observed increasing trend between lean and rich conditions. The effect of stoichiometry and dilution on the observed variation in ignition threshold was explained using 0-D constant pressure delay time computations.

Item Type:Article
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URLURL TypeDescription
Melguizo-Gavilanes, J.0000-0001-5174-6003
Shepherd, J. E.0000-0003-3181-9310
Alternate Title:Ignition by moving hot spheres in H2-O2-N2 environments
Additional Information:© 2018 The Combustion Institute. Published by Elsevier Inc. Received 30 November 2017, Revised 3 July 2018, Accepted 6 July 2018, Available online 30 July 2018.
Subject Keywords:Hot particle ignition; Hydrogen; Interferometry; Numerical simulation
Record Number:CaltechAUTHORS:20180730-090326535
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Official Citation:S. Jones, J. Melguizo-Gavilanes, J.E. Shepherd, Ignition by moving hot spheres in H2-O2-N2 environments, Proceedings of the Combustion Institute, Volume 37, Issue 2, 2019, Pages 1597-1604, ISSN 1540-7489, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88346
Deposited By: Tony Diaz
Deposited On:30 Jul 2018 16:43
Last Modified:29 Jan 2019 17:49

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