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Premixed Combustion Characteristics of Hydrogen/Air in a Micro-Cylindrical Combustor with Double Ribs

Author

Listed:
  • Yi Ma

    (School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China
    Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing, Shaoyang University, Shaoyang 422000, China)

  • Wenhua Yuan

    (School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China
    Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing, Shaoyang University, Shaoyang 422000, China)

  • Shaomin Zhao

    (School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China)

  • Hongru Fang

    (School of Energy Science and Engineering, Central South University, Changsha 410083, China)

Abstract

Hydrogen is a promising zero-carbon fuel, and its application in the micro-combustor can promote carbon reduction. The structural design of micro-combustors is crucial for combustion characteristics and thermal performance improvement. This study investigates the premixed combustion characteristics of hydrogen/air in a micro-cylindrical combustor with double ribs, using an orthogonal design method to assess the impact of various geometric parameters on thermal performance. The results indicate that the impact of rib height, rib position, and inclined angle is greater than rib width and their interactions, while their influence decreases in that order. Increased rib height improves mean wall temperature and exergy efficiency due to an expanded recirculation region and increased flame–wall contact, but negatively affects temperature uniformity and combustion efficiency. Although double ribs enhance performance, placing them too close may reduce heat transfer due to the low-temperature region between the ribs. When the double ribs are positioned at the axial third equinoxes of the micro-combustor, the highest mean wall temperature is achieved. Meanwhile, with a rib height of 0.3 and an inclined angle of 45°, the micro-combustor achieves optimal thermal performance, with the mean wall temperature increasing by 61.32 K.

Suggested Citation

  • Yi Ma & Wenhua Yuan & Shaomin Zhao & Hongru Fang, 2024. "Premixed Combustion Characteristics of Hydrogen/Air in a Micro-Cylindrical Combustor with Double Ribs," Energies, MDPI, vol. 17(20), pages 1-21, October.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:20:p:5165-:d:1500545
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    References listed on IDEAS

    as
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