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Yoo, Chun Sang
Combustion & Propulsion Lab
Research Interests
  • Numerical turbulent combustion
  • Combustion modelling
  • Gas turbine combustion

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On the flame structure and stabilization characteristics of autoignited laminar lifted n-heptane jet flames in heated coflow air

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Title
On the flame structure and stabilization characteristics of autoignited laminar lifted n-heptane jet flames in heated coflow air
Author
Jung, Ki SungKim, Seung OokChung, Suk HoYoo, Chun Sang
Issue Date
2021-01
Publisher
Elsevier BV
Citation
COMBUSTION AND FLAME, v.223, pp.307 - 3019
Abstract
The characteristics of the flame structure and stabilization of autoignited laminar lifted n -heptane jet flames in heated coflow air are investigated by performing 2-D numerical simulations with a 68-species skeletal chemical mechanism of n -heptane oxidation. The present simulations can reproduce a distinct transition of a lifted jet flame from a tribrachial edge flame mode to a moderate or intense low-oxygen dilution (MILD) combustion mode observed from a previous experimental study, featuring a significant variation in the liftoffheight with the fuel jet velocity, U 0 . It is found that a lifted flame with the MILD combustion mode can exist further downstream of the stoichiometric mixture fraction isoline due to au- toignition occurring upstream of the flamebase. The displacement speed and chemical explosive mode analyses reveal that the autoignition of lean mixtures plays a critical role in stabilizing lifted flames with the MILD combustion mode. It is further elucidated from additional numerical simulations that an au- toignited laminar lifted n -heptane jet flames can be stabilized as one of the following forms depending on the inlet temperature, T 0 , and U 0 : a MILD combustion, a partially-premixed edge flame, a tribrachial edge flame, and a tetrabrachial edge flame. Based on the flame structures and stabilization mechanisms of the lifted flames, a flame regime diagram is constructed in the normalized U 0 and Damköhler number space.
URI
https://scholarworks.unist.ac.kr/handle/201301/48255
URL
https://www.sciencedirect.com/science/article/pii/S0010218020304284?via%3Dihub
DOI
10.1016/j.combustflame.2020.10.008
ISSN
0010-2180
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