Journal article
Local extinction and reignition mechanism in a turbulent lifted flame: A direct numerical simulation study
S Karami, M Talei, ER Hawkes, JH Chen
Proceedings of the Combustion Institute | ELSEVIER SCIENCE INC | Published : 2017
Abstract
Local extinction and reignition was explored in a direct numerical simulation (DNS) dataset of a turbulent lifted flame. A lifted flame is relevant to practical combustion systems. Thirty individual extinction holes were identified as regions on the stoichiometric surface which have a product mass fraction less than a critical value. Large outwardly pushing structures caused compressive strain rates normal to the mixture-fraction iso-surface resulting to the initial creation of holes. Hole growth occurred in two phases. The edge-propagation velocity is initially negative and the fluid dynamic tangential strain rate on the hole surface is positive leading to rapid hole growth. Subsequently lo..
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Awarded by U.S. Department of Energy
Funding Acknowledgements
This work was supported by the Australian Research Council. The work at Sandia National Laboratories was supported by the Division of Chemical Sciences, Geosciences and Bio-sciences, the Office of Basic Energy Sciences, the U.S. Department of Energy. Sandia National Laboratories is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the U.S. Department of Energy under contract DE-AC04-94-AL85000. The research benefited from computational resources provided through the National Computational Merit Allocation Scheme, supported by the Australian Government. The computational facilities supporting this project included the Australian NCI National Facility, Intersect Australia Pty Ltd., Pawsey Supercomputing Centre.