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Parametric analysis on the combustion and thermal performance of a swirl micro-combustor for micro thermophotovoltaic system

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  • Yang, Xiao
  • He, Zhihong
  • Cha, Suna
  • Zhao, Lei
  • Dong, Shikui
  • Tan, Heping

Abstract

A swirl micro-combustor which has strong capability to stabilize the flame has been developed and is promising to be used in micro thermophotovoltaic power generators in this work. Heat recirculation plays a requisite role in flame stability and thermal performance of micro combustors. Thus, the effects of three parameters (center inlet radius w1, swirler width w2, and step height w3) that determine the size and location of the recirculation zones in a premixed hydrogen/air flame are investigated numerically. The results show that inner recirculation zone and corner recirculation zone generated by a swirler are critical for stabilizing the flame. The parameter w1 has an insignificant influence on the thermal performance. Enlarging the inner recirculation zone by decreasing w2 provokes enhanced heat transfer, and increases the temperature level and temperature non-uniformity of combustor walls. The size of corner recirculation zone is increased by increasing w3, which raises the outer wall temperature uniformity. Based on the parametric analysis, the newly designed micro combustor possesses a high wall temperature level. Additionally, the energy output increment is between 9.1% and 14.2% at hydrogen mass flow rate of 0.0006 g/s when stoichiometric hydrogen/air ratio ranges from 0.6 to 1.4.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:198:y:2020:i:c:s0360544220304199
    DOI: 10.1016/j.energy.2020.117312
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    References listed on IDEAS

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    4. Zhao, He & Zhao, Dan & Becker, Sid & Rong, Hui & Zhao, Xiaohuan, 2023. "Entropy generation and improved thermal performance investigation on a hydrogen-fuelled double-channel microcombustor with Y-shaped internal fins," Energy, Elsevier, vol. 283(C).
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