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CLC number: V231

On-line Access: 2021-04-12

Received: 2020-03-05

Revision Accepted: 2020-08-31

Crosschecked: 2021-04-06

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Jin-cheng Zhang

https://orcid.org/0000-0003-3393-7871

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Journal of Zhejiang University SCIENCE A 2021 Vol.22 No.4 P.314-330

http://doi.org/10.1631/jzus.A2000087


Stabilization mechanisms of lifted flames in a supersonic stepped-wall jet combustor


Author(s):  Jin-cheng Zhang, Ming-bo Sun, Zhen-guo Wang, Hong-bo Wang, Chao-yang Liu

Affiliation(s):  Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China

Corresponding email(s):   zhangjincheng_512@163.com

Key Words:  Large eddy simulation (LES), Autoignition, Lifted flame, Flame stabilization, Assumed probability density function (PDF)


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Jin-cheng Zhang, Ming-bo Sun, Zhen-guo Wang, Hong-bo Wang, Chao-yang Liu. Stabilization mechanisms of lifted flames in a supersonic stepped-wall jet combustor[J]. Journal of Zhejiang University Science A, 2021, 22(4): 314-330.

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author="Jin-cheng Zhang, Ming-bo Sun, Zhen-guo Wang, Hong-bo Wang, Chao-yang Liu",
journal="Journal of Zhejiang University Science A",
volume="22",
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pages="314-330",
year="2021",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2000087"
}

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%T Stabilization mechanisms of lifted flames in a supersonic stepped-wall jet combustor
%A Jin-cheng Zhang
%A Ming-bo Sun
%A Zhen-guo Wang
%A Hong-bo Wang
%A Chao-yang Liu
%J Journal of Zhejiang University SCIENCE A
%V 22
%N 4
%P 314-330
%@ 1673-565X
%D 2021
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2000087

TY - JOUR
T1 - Stabilization mechanisms of lifted flames in a supersonic stepped-wall jet combustor
A1 - Jin-cheng Zhang
A1 - Ming-bo Sun
A1 - Zhen-guo Wang
A1 - Hong-bo Wang
A1 - Chao-yang Liu
J0 - Journal of Zhejiang University Science A
VL - 22
IS - 4
SP - 314
EP - 330
%@ 1673-565X
Y1 - 2021
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2000087


Abstract: 
flame stabilization is the key to extending scramjets to hypersonic speeds; accordingly, this topic has attracted much attention in theoretical research and engineering design. This study performed large eddy simulations (LESs) of lifted hydrogen jet combustion in a stepped-wall combustor, focusing on the flame stabilization mechanisms, especially for the autoignition effect. An assumed probability density function (PDF) approach was used to close the subgrid chemical reaction source. The reliability of the solver was confirmed by comparing the LES results with experimental data and published simulated results. The hydrogen jet and the incoming stream were first mixed by entraining large-scale vortices in the shear layer, and stable combustion in the near-wall region was achieved downstream of the flame induction region. The autoignition cascade is a transition of fuel-rich flame to stoichiometric ratio flame that plays a role in forming the flame base, which subsequently causes downstream flame stabilization. Three cases with different jet total temperatures are compared, and the results show that the increase in the total temperature reduces the lift-off distance of the flame. In the highest total temperature case, an excessively large scalar dissipation rate inhibits the autoignition cascade, resulting in a fuel-rich low-temperature flame.

超声速台阶壁面燃烧室中射流抬举火焰的稳定机制

目的:深入理解超声速条件下火焰稳定机制,为超燃冲压发动机燃烧室的优化提供理论基础.
创新点:1. 通过大涡模拟准确地再现Burrows-Kurkov实验中台阶壁面射流燃烧室的反应流场;2. 揭示射流火焰稳定抬举的机制;3. 总结射流总温对火焰抬举特性的影响.
方法:1. 采用大涡模拟,获得了瞬时和时均的反应流场参数;2. 通过计算燃烧学的数据分析,提取湍流火焰特性.
结论:1. 自点火过程维持了混合层中抬举火焰的稳定,并进一步在下游形成充分发展的湍流扩散火焰;2. 升高射流总温会使火焰抬举高度降低,而过高的射流总温会抑制火焰温度的升高.

关键词:大涡模拟;自点火;抬举火焰;火焰稳定;设定型概率密度函数

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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