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.
概 要
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.
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Contributions
Chao-yang LIU provided the conceptualization and developed the numerical simulation codes. Jin-cheng ZHANG executed the research process and formal analysis, and wrote and revised the manuscript. Hong-bo WANG revised the manuscript and assisted analysis. Ming-bo SUN provided the funding acquisition and resources. Zhen-guo WANG took responsibility for the research.
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Jin-cheng ZHANG, Ming-bo SUN, Zhen-guo WANG, Hong-bo WANG, and Chao-yang LIU declare that they have no conflict of interest.
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Project supported by the National Natural Science Foundation of China (Nos. 91741205 and 11522222)
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Zhang, Jc., Sun, Mb., Wang, Zg. et al. Stabilization mechanisms of lifted flames in a supersonic stepped-wall jet combustor. J. Zhejiang Univ. Sci. A 22, 314–330 (2021). https://doi.org/10.1631/jzus.A2000087
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DOI: https://doi.org/10.1631/jzus.A2000087
Key words
- Large eddy simulation (LES)
- Autoignition
- Lifted flame
- Flame stabilization
- Assumed probability density function (PDF)