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Effects of differential diffusion on ignition of stoichiometric hydrogen-air by moving hot spheres

Melguizo-Gavilanes, J. and Mével, R. and Coronel, S. and Shepherd, J. E. (2017) Effects of differential diffusion on ignition of stoichiometric hydrogen-air by moving hot spheres. Proceedings of the Combustion Institute, 36 (1). pp. 1155-1163. ISSN 1540-7489. https://resolver.caltech.edu/CaltechAUTHORS:20160715-063930519

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Abstract

Studying thermal ignition mechanisms is a key step for evaluating many ignition hazards. In the present work, two-dimensional simulations with detailed chemistry are used to study the effect of differential diffusion on the prediction of ignition thresholds of a stoichiometric hydrogen-air mixture by moving hot spheres. Numerical experiments showed an increase of 40 K in the minimum ignition temperature required for ignition when diffusion of species at different rates is taken into account. Detailed analysis of the species profiles at the ignition location and a sensitivity study of the system to the diffusivity of H_2 and H revealed the key role played by the diffusion of H atoms in preventing ignition to take place at temperatures below 1000 K.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.proci.2016.06.120DOIArticle
http://www.sciencedirect.com/science/article/pii/S154074891630178XPublisherArticle
ORCID:
AuthorORCID
Shepherd, J. E.0000-0003-3181-9310
Additional Information:© 2016 The Combustion Institute. Published by Elsevier Inc. Received 25 November 2015; accepted 16 June 2016; Available online 28 June 2016. Computing resources provided by the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number ACI-1053575. JMG was supported by NSERC Postdoctoral Fellowship Program, and SC and RM by The Boeing Company through grant CT-BA-GTA-1.
Group:GALCIT
Funders:
Funding AgencyGrant Number
NSFACI-1053575
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Boeing CompanyCT-BA-GTA-1
Subject Keywords:Hot surface ignition; Differential diffusion; Minimum ignition temperature; Hydrogen-air detailed chemistry
Issue or Number:1
Record Number:CaltechAUTHORS:20160715-063930519
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160715-063930519
Official Citation:J. Melguizo-Gavilanes, R. Mével, S. Coronel, J.E. Shepherd, Effects of differential diffusion on ignition of stoichiometric hydrogen-air by moving hot spheres, Proceedings of the Combustion Institute, Volume 36, Issue 1, 2017, Pages 1155-1163, ISSN 1540-7489, http://doi.org/10.1016/j.proci.2016.06.120. (http://www.sciencedirect.com/science/article/pii/S154074891630178X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69035
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:15 Jul 2016 16:43
Last Modified:03 Oct 2019 10:18

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