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Experimental and numerical study on moving hot particle ignition

Coronel, Stephanie A. and Melguizo-Gavilanes, Josué and Mével, Rémy and Shepherd, Joseph E. (2018) Experimental and numerical study on moving hot particle ignition. Combustion and Flame, 192 . pp. 495-506. ISSN 0010-2180. http://resolver.caltech.edu/CaltechAUTHORS:20180320-075116842

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Abstract

Ignition thresholds for n-hexane-air were experimentally and numerically determined using a moving hot sphere of 6 mm in diameter. The novel experimental setup built for this purpose was described in detail. Two-color pyrometry was used for surface temperature measurements, and shearing interferometry flow field visualization was used to observe the onset of an ignition kernel, and subsequent flame formation and propagation. The probability of ignition was found to be 90% at a sphere surface temperature of 1224 K. Analysis of the interferograms at the ignition threshold indicated that ignition occurs near the region of flow separation. Numerical simulations of the transient development of the 2-D axisymmetric motion and ignition were performed. Four reduced chemical mechanisms, including high and low temperature chemistry, and two diffusion models were used to determine their impact on the numerical prediction of ignition thresholds. The simulation results were unaffected by the choice of diffusion model but were found to be sensitive to the chemical kinetic mechanism used. The predicted ignition threshold temperatures were within 6–12% of the experimentally determined values. The numerical fields of the energy source term and a wall heat flux analysis confirmed the experimental observation that ignition occurs near the region of flow separation at the ignition threshold. Detailed analysis of the species temporal evolution at the ignition location revealed that n-hexane is present in small amounts, demonstrating the importance of accounting for fuel decomposition within the thermal boundary layer when developing simple chemical reaction models.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.combustflame.2018.02.027DOIArticle
https://www.sciencedirect.com/science/article/pii/S0010218018300993PublisherArticle
ORCID:
AuthorORCID
Coronel, Stephanie A.0000-0002-7088-7976
Melguizo-Gavilanes, Josué0000-0001-5174-6003
Shepherd, Joseph E.0000-0003-3181-9310
Additional Information:© 2018 The Combustion Institute. Published by Elsevier Inc. Received 5 December 2017, Revised 27 January 2018, Accepted 26 February 2018, Available online 20 March 2018. This 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.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Boeing Company Strategic Research and Development Relationship CT-BA-GTA-1
Subject Keywords:Thermal ignition; Sphere; Interferometry; Boundary layer ignition
Record Number:CaltechAUTHORS:20180320-075116842
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180320-075116842
Official Citation:Stephanie A. Coronel, Josué Melguizo-Gavilanes, Rémy Mével, Joseph E. Shepherd, Experimental and numerical study on moving hot particle ignition, Combustion and Flame, Volume 192, June 2018, Pages 495-506, ISSN 0010-2180, https://doi.org/10.1016/j.combustflame.2018.02.027. (https://www.sciencedirect.com/science/article/pii/S0010218018300993)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85370
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Mar 2018 17:27
Last Modified:26 Mar 2018 17:27

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