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Effect of Channel Diameter on the Combustion and Thermal Behavior of a Hydrogen/Air Premixed Flame in a Swirl Micro-Combustor

Author

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  • Xiao Yang

    (Key laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Zhihong He

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Lei Zhao

    (Key laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Shikui Dong

    (Key laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Heping Tan

    (Key laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

Abstract

Improving the flame stability and thermal behavior of the micro-combustor (MC) are major challenges in microscale combustion. In this paper, the micro combustions of an H 2 /air premixed flame in a swirl MC with various channel diameters ( D in = 2, 3, 4 mm) were analyzed based on an established three-dimensional numerical model. The effects of hydrogen mass flow rate, thermal conductivity of walls, and the preferential transport of species were investigated. The results indicated that the flame type was characterized by the presence of two recirculation zones. The flame was anchored by the recirculation zones, and the anchoring location of the flame root was the starting position of the recirculation zones. The recirculation zones had a larger distribution of local equivalence ratio, especially in the proximity of the flame root, indicating the formation of a radical pool. The combustion efficiency increased with an increasing D in due to the longer residence time of the reactants. Furthermore, the MC with D in = 2 mm obtained the highest outer wall temperature distribution. However, the MC with D in = 4 mm had a better uniformity of outer wall temperature and large emitter efficiency due to the larger radiation surface. An increase in thermal conductivity boosts the thermal performance of combustion efficiency, emitter efficiency, and wall temperature uniformity. But there is a critical point of thermal conductivity that can increase the thermal performance. The above results can offer us significant guidance for designing MC with high thermal performance.

Suggested Citation

  • Xiao Yang & Zhihong He & Lei Zhao & Shikui Dong & Heping Tan, 2019. "Effect of Channel Diameter on the Combustion and Thermal Behavior of a Hydrogen/Air Premixed Flame in a Swirl Micro-Combustor," Energies, MDPI, vol. 12(20), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:20:p:3821-:d:274735
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    References listed on IDEAS

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    Cited by:

    1. Yang, Xiao & Yang, Wenming & Dong, Shikui & Tan, Heping, 2020. "Flame stability analysis of premixed hydrogen/air mixtures in a swirl micro-combustor," Energy, Elsevier, vol. 209(C).
    2. Rahbari, Alireza & Homayoonfar, Sajad & Valizadeh, Esmaeil & Aligoodarz, Mohammad Reza & Toghraie, Davood, 2021. "Effects of micro-combustor geometry and size on the heat transfer and combustion characteristics of premixed hydrogen/air flames," Energy, Elsevier, vol. 215(PA).
    3. Yang, Xiao & He, Zhihong & Cha, Suna & Zhao, Lei & Dong, Shikui & Tan, Heping, 2020. "Parametric analysis on the combustion and thermal performance of a swirl micro-combustor for micro thermophotovoltaic system," Energy, Elsevier, vol. 198(C).
    4. Zuo, Wei & Li, Jing & Zhang, Yuntian & Li, Qingqing & He, Zhu, 2020. "Effects of multi-factors on comprehensive performance of a hydrogen-fueled micro-cylindrical combustor by combining grey relational analysis and analysis of variance," Energy, Elsevier, vol. 199(C).

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