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Effect of a catalytic segment on flame stability in a micro combustor with controlled wall temperature profile

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  • Wang, Shixuan
  • Li, Linhong
  • Xia, Yongfang
  • Fan, Aiwu
  • Yao, Hong

Abstract

In the present study, the stability of methane/air flames in a micro cylindrical channel with a prescribed wall temperature profile and a platinum (Pt) segment was investigated numerically. Two dimensional simulation was performed by the commonly used computational fluid dynamics software Fluent 6.3, incorporated with detailed gas combustion chemistry GRI 3.0 and catalytic reaction mechanism of methane/air on platinum. The results demonstrate that all the unstable flames become stationary in the presence of a 3-mm Pt segment located at x = 49–52 mm (total length of 80 mm) on the wall surface, and the response of flame position to inlet velocity exhibits an S-shaped curve. Detailed analysis was conducted to reveal the underlying mechanisms responsible for the existences of two turning points, which showed that the catalytic segment exerts a negative influence on homogeneous combustion at high and medium velocities, whereas it can enhance the homogeneous combustion at low velocities. In summary, the present study revealed the complicated effects of heterogeneous reaction on homogeneous combustion and suggested an effective and economic method to suppress flame instabilities in micro combustors.

Suggested Citation

  • Wang, Shixuan & Li, Linhong & Xia, Yongfang & Fan, Aiwu & Yao, Hong, 2018. "Effect of a catalytic segment on flame stability in a micro combustor with controlled wall temperature profile," Energy, Elsevier, vol. 165(PA), pages 522-531.
    • Handle: RePEc:eee:energy:v:165:y:2018:i:pa:p:522-531
    DOI: 10.1016/j.energy.2018.09.120
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    References listed on IDEAS

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    Cited by:

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    3. Ni, Siliang & Zhao, Dan & Sellier, Mathieu & Li, Junwei & Chen, Xinjian & Li, Xinyan & Cao, Feng & Li, Weixuan, 2021. "Thermal performances and emitter efficiency improvement studies on premixed micro-combustors with different geometric shapes for thermophotovoltaics applications," Energy, Elsevier, vol. 226(C).
    4. He, Ziqiang & Yan, Yunfei & Zhao, Ting & Zhang, Zhien & Mikulčić, Hrvoje, 2022. "Parametric study of inserting internal spiral fins on the micro combustor performance for thermophotovoltaic systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 165(C).
    5. Xiang, Ying & Yuan, Zili & Wang, Shixuan & Fan, Aiwu, 2019. "Effects of flow rate and fuel/air ratio on propagation behaviors of diffusion H2/air flames in a micro-combustor," Energy, Elsevier, vol. 179(C), pages 315-322.
    6. Cai, Tao & Tang, Aikun & Zhao, Dan & Zhou, Chen & Huang, Qiuhan, 2020. "Flame dynamics and stability of premixed methane/air in micro-planar quartz combustors," Energy, Elsevier, vol. 193(C).
    7. E, Jiaqiang & Luo, Bo & Han, Dandan & Chen, Jingwei & Liao, Gaoliang & Zhang, Feng & Ding, Jiangjun, 2022. "A comprehensive review on performance improvement of micro energy mechanical system: Heat transfer, micro combustion and energy conversion," Energy, Elsevier, vol. 239(PE).

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