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Hot surface ignition dynamics in premixed hydrogen–air near the lean flammability limit

Boeck, L. R. and Melguizo-Gavilanes, J. and Shepherd, J. E. (2019) Hot surface ignition dynamics in premixed hydrogen–air near the lean flammability limit. Combustion and Flame, 210 . pp. 467-478. ISSN 0010-2180. https://resolver.caltech.edu/CaltechAUTHORS:20190930-133756726

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Abstract

The dynamics of ignition of premixed hydrogen–air from a hot glow plug were investigated in a combined experimental and numerical study. Surface temperatures during heating and at ignition were obtained from 2-color pyrometry, gas temperatures were measured by high-speed Mach–Zehnder interferometry, and far-field effects were captured by high-speed schlieren imaging. Numerical simulations considered detailed chemical kinetics and differential diffusion effects. In addition to the known cyclic (puffing) combustion phenomenon, singular ignition events (single puff) were observed near the lean flammability limit. Detailed analysis of the results of our numerical simulations reveal the existence of multiple combustion transients within the thermal boundary layer following the initial ignition event and, at late times, sustained chemical reaction within a thermal plume above the glow plug. The results have significant implications for ignition from hot surfaces within near-flammability limit mixtures, at the edge of plumes resulting from accidental release of hydrogen, or within the containments of nuclear power plants during severe accidents.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.combustflame.2019.09.002DOIArticle
ORCID:
AuthorORCID
Melguizo-Gavilanes, J.0000-0001-5174-6003
Shepherd, J. E.0000-0003-3181-9310
Additional Information:© 2019 The Combustion Institute. Published by Elsevier. Received 5 February 2019, Revised 11 March 2019, Accepted 1 September 2019, Available online 28 September 2019. The present work was carried out in the Explosion Dynamics Laboratory of the California Institute of Technology and was supported by The Boeing Company through a Strategic Research and Development Relationship Agreement CT-BA-GTA-1. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by the National Science Foundation grant number ACI-1548562.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Boeing Company Strategic Research and Development Relationship CT-BA-GTA-1
NSFACI-1548562
Subject Keywords:Experiments; Hot surface; Hydrogen; Ignition; Numerical simulation
Record Number:CaltechAUTHORS:20190930-133756726
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190930-133756726
Official Citation:L.R. Boeck, J. Melguizo-Gavilanes, J.E. Shepherd, Hot surface ignition dynamics in premixed hydrogen–air near the lean flammability limit, Combustion and Flame, Volume 210, 2019, Pages 467-478, ISSN 0010-2180, https://doi.org/10.1016/j.combustflame.2019.09.002. (http://www.sciencedirect.com/science/article/pii/S001021801930416X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98956
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:30 Sep 2019 21:12
Last Modified:03 Oct 2019 21:46

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