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Lookup NU author(s): Jiawei Lai, Professor Nilanjan ChakrabortyORCiD
This is the of an article that has been published in its final definitive form by Taylor and Francis Inc., 2019.
For re-use rights please refer to the publisher's terms and conditions.
© 2018 Taylor & Francis Direct numerical simulations (DNS) of oblique wall quenching of a turbulent V-flame and head-on quenching (HOQ) of a statistically planar flame by isothermal inert walls have been utilized to analyze the statistics of wall heat flux, flame quenching distance in terms of the distributions of flow topologies and their contributions to the wall heat flux. The flow topologies have been categorized into eight generic flow configurations (i.e., S1–S8) in terms of three invariants of the velocity gradient tensor (i.e., first, second and third P, Q, and R, respectively). It has been found that nodal (i.e., strain rate dominated) flow topologies are major contributors to the wall heat flux when it attains large magnitude in the HOQ configuration, whereas focal (i.e., vorticity-dominated) topologies contribute significantly to the wall heat flux in the case of oblique flame quenching. These differences in the heat transfer mechanisms contribute to the differences in wall heat flux and flame quenching distance between HOQ and oblique quenching configurations. The maximum wall heat flux magnitude in the case of oblique flame quenching has been found to be greater than that in the corresponding turbulent HOQ case. By contrast, the minimum wall Peclet number, which quantifies the flame quenching distance, in the case of oblique quenching has been found to be smaller than that in the case of HOQ.
Author(s): Lai J, Chakraborty N, Zhang P, Wang L
Publication type: Article
Publication status: Published
Journal: Combustion Science and Technology
Year: 2019
Volume: 191
Issue: 2
Pages: 353-381
Online publication date: 08/05/2018
Acceptance date: 18/04/2018
Date deposited: 18/04/2018
ISSN (print): 0010-2202
ISSN (electronic): 1563-521X
Publisher: Taylor and Francis Inc.
URL: https://doi.org/10.1080/00102202.2018.1467897
DOI: 10.1080/00102202.2018.1467897
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