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

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Conditional moment closure modelling for HCCI with temperature inhomogeneities

Cited 2 times inthomson ciCited 1 times inthomson ci
Title
Conditional moment closure modelling for HCCI with temperature inhomogeneities
Author
Salehi, FatemehTalei, MohsenHawkes, Evatt R.Yoo, Chun SangLucchini, TommasoD'Errico, GianlucaKook, Sanghoon
Issue Date
2015-01
Publisher
ELSEVIER SCIENCE INC
Citation
PROCEEDINGS OF THE COMBUSTION INSTITUTE, v.35, no.3, pp.3087 - 3095
Abstract
This paper presents an approach for modelling combustion in homogeneous charge compression ignition (HCCI) conditions based on the first order conditional moment closure (CMC) method. The model is implemented into the open source C++ computational fluid dynamic (CFD) code known as OpenFOAM. Direct numerical simulations (DNSs) are used to evaluate the performance of the CFD-CMC solver. In the two-dimensional (2D) DNS cases, ignition of a lean n-heptane/air mixture with thermal inhomogeneities is simulated for nine cases, with two different mean temperatures and several different levels of thermal stratification. Results from the CFD-CMC solver are in excellent agreement with the DNS for cases which exhibit a spontaneous sequential ignition mode of combustion whereas for the cases in which a mixed mode of deflagration and spontaneous ignition exists, the CMC underpredicts the ignition delay. Further investigation using the DNS data demonstrates that this discrepancy is primarily attributed to the first order closure assumption. Conditional fluctuations are found to be more significant in the case with deflagrations. Further analysis of the DNS shows that scalar dissipation fluctuations are the cause of conditional fluctuations. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/10757
URL
https://www.sciencedirect.com/science/article/pii/S1540748914000388?via%3Dihub
DOI
10.1016/j.proci.2014.05.035
ISSN
1540-7489
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