CLC number: V43
On-line Access: 2020-10-15
Received: 2019-08-24
Revision Accepted: 2020-02-13
Crosschecked: 2020-07-15
Cited: 0
Clicked: 3995
Yong-chao Sun, Zun Cai, Tai-yu Wang, Ming-bo Sun, Cheng Gong, Yu-hui Huang. Numerical study on cavity ignition process in a supersonic combustor[J]. Journal of Zhejiang University Science A, 2020, 21(10): 848-858.
@article{title="Numerical study on cavity ignition process in a supersonic combustor",
author="Yong-chao Sun, Zun Cai, Tai-yu Wang, Ming-bo Sun, Cheng Gong, Yu-hui Huang",
journal="Journal of Zhejiang University Science A",
volume="21",
number="10",
pages="848-858",
year="2020",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900419"
}
%0 Journal Article
%T Numerical study on cavity ignition process in a supersonic combustor
%A Yong-chao Sun
%A Zun Cai
%A Tai-yu Wang
%A Ming-bo Sun
%A Cheng Gong
%A Yu-hui Huang
%J Journal of Zhejiang University SCIENCE A
%V 21
%N 10
%P 848-858
%@ 1673-565X
%D 2020
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1900419
TY - JOUR
T1 - Numerical study on cavity ignition process in a supersonic combustor
A1 - Yong-chao Sun
A1 - Zun Cai
A1 - Tai-yu Wang
A1 - Ming-bo Sun
A1 - Cheng Gong
A1 - Yu-hui Huang
J0 - Journal of Zhejiang University Science A
VL - 21
IS - 10
SP - 848
EP - 858
%@ 1673-565X
Y1 - 2020
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1900419
Abstract: Large eddy simulations (LESs) of cavity ignition processes were performed in a 2D ethylene-fueled supersonic combustor with a single rear-wall-expansion cavity based on OpenFOAM. The ethylene combustion was modelled using a 35-step with 20-specie ethylene chemical mechanism, which had been validated by CHEMKIN calculations. The effect on the ignition process of different ignition sites inside the cavity was then studied. It was found that the rear region of the cavity floor is an optimized ignition site where successful ignitions will be achieved. According to different ignition behaviors, two flame extinguishing modes could be identified: blown-off extinguishing mode and flow dissipation extinguishing mode. Blown-off extinguishing mode mainly occurred after ignition near the cavity shear layer, in which the initial flame was blown off directly due to the high speed of the supersonic core flow. Flow dissipation extinguishing mode is likely to occur after ignition near the front and middle cavity floor as a result of severe turbulent dissipations and limited chemical reactions. The study indicates that the movement routine of the initial flame is important for the ignition process, including both moving towards a favorable flow field and forming a large heat release region along the movement.
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