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Flame propagation across an obstacle: OH-PLIF and 2-D simulations with detailed chemistry

Boeck, L. R. and Lapointe, S. and Melguizo-Gavilanes, J. and Ciccarelli, G. (2017) Flame propagation across an obstacle: OH-PLIF and 2-D simulations with detailed chemistry. Proceedings of the Combustion Institute, 36 (2). pp. 2799-2806. ISSN 1540-7489. https://resolver.caltech.edu/CaltechAUTHORS:20160705-083923958

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Abstract

Flame propagation across a single obstacle inside a closed square channel is studied experimentally and numerically using a stoichiometric H_2/O_2 mixture at initial conditions 15 kPa and 300 K. The 50% blockage obstacle consists of a pair of fence-type obstacles mounted on the top and bottom walls of the channel. Direct optical visualization was performed using single-image measurement of the planar laser-induced fluorescence of the OH radical (OH-PLIF) and simultaneous high-speed schlieren video to study the flame topology and the flame tip velocity along the channel streamwise axis, respectively. The OH-PLIF images provide a novel level of detail and permit a thorough evaluation of the simulation accuracy. The flame tip accelerates to a peak velocity of 590 m/s just downstream of the obstacle followed by a deceleration and subsequent re-acceleration. The unburnt gas flow ahead of the flame is subsonic at all times. The flame does not show any signs of diffusive-thermal instability. Vortex–flame interactions in the recirculation zones downstream of the obstacle wrinkle the flame. The numerical simulations, based on solving the 2-D compressible reactive Navier–Stokes equations with detailed chemistry, predict the flame tip velocity accurately. However, differences in flame topology are observed, specifically, wrinkling is over-estimated. The over-prediction of flame wrinkling suggests a lower dissipation rate in the numerical simulations than in reality, which could be a consequence of neglecting the third channel dimension. Conditional means of the fuel consumption rate are similar to the consumption rates of 1-D unstretched laminar flames at all times. The increase in pressure during flame propagation causes an increase in fuel consumption rate which needs to be accounted for in simplified modeling approaches.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.proci.2016.06.097DOIArticle
http://www.sciencedirect.com/science/article/pii/S1540748916301559PublisherArticle
ORCID:
AuthorORCID
Lapointe, S.0000-0003-2789-6540
Additional Information:© 2016 The Combustion Institute. Published by Elsevier Inc. Received 3 December 2015; accepted 11 June 2016. The authors are grateful to the National Research Council Canada for the loan of the intensified camera and UV lens, to Dr. Matthew Johnson from Carleton University for the loan of the lasers and optics, and to Adam Steinberg for the loan of the OH narrow band filter. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant number ACI-1053575 , and J. Melguizo-Gavilanes was supported by NSERC Postdoctoral Fellowship Program.
Funders:
Funding AgencyGrant Number
NSFACI-1053575
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Subject Keywords:Flame acceleration; OH-PLIF; Numerical simulations; Detailed chemistry
Issue or Number:2
Record Number:CaltechAUTHORS:20160705-083923958
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160705-083923958
Official Citation:L.R. Boeck, S. Lapointe, J. Melguizo-Gavilanes, G. Ciccarelli, Flame propagation across an obstacle: OH-PLIF and 2-D simulations with detailed chemistry, Proceedings of the Combustion Institute, Volume 36, Issue 2, 2017, Pages 2799-2806, ISSN 1540-7489, http://doi.org/10.1016/j.proci.2016.06.097. (http://www.sciencedirect.com/science/article/pii/S1540748916301559)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68823
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:06 Jul 2016 02:32
Last Modified:03 Oct 2019 10:16

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