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Thermodynamics of premixed combustion in a heat recirculating micro combustor

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  • Rana, Uttam
  • Chakraborty, Suman
  • Som, S.K.

Abstract

A thermodynamic model has been developed to evaluate exergy transfer and its destruction in the process of premixed combustion in a heat recirculating micro combustor. Exergy destruction caused by process irreversibilities is characterized by entropy generation in the process. The entropy transport equation along with the solution of temperature and species concentration fields in the wake of flame sheet assumptions have been used to determine the different components of entropy generation. The role of thermal conductivity and thickness of combustor wall, and Peclet number on transfer and destruction rate of exergy is depicted in the process of flame stabilization via heat recirculation. The entropy generations due to gas phase heat conduction and chemical reaction are identified as the major sources of exergy destruction. The total irreversibility in pre-flame region is confined only within a small distance upstream of the flame. It has been observed that the local volumetric entropy generation is higher near the axis than that near the combustor wall. The second law efficiency is almost invariant with heat loss from the combustor, Peclet number, and thermal conductivity and thickness of combustor wall.

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  • Rana, Uttam & Chakraborty, Suman & Som, S.K., 2014. "Thermodynamics of premixed combustion in a heat recirculating micro combustor," Energy, Elsevier, vol. 68(C), pages 510-518.
    • Handle: RePEc:eee:energy:v:68:y:2014:i:c:p:510-518
    DOI: 10.1016/j.energy.2014.02.070
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    3. 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.
    4. Peng, Qingguo & Wu, Yifeng & E, Jiaqiang & Yang, Wenming & Xu, Hongpeng & Li, Zhenwei, 2019. "Combustion characteristics and thermal performance of premixed hydrogen-air in a two-rearward-step micro tube," Applied Energy, Elsevier, vol. 242(C), pages 424-438.
    5. Zhuang Kang & Zhiwei Shi & Jiahao Ye & Xinghua Tian & Zhixin Huang & Hao Wang & Depeng Wei & Qingguo Peng & Yaojie Tu, 2023. "A Review of Micro Power System and Micro Combustion: Present Situation, Techniques and Prospects," Energies, MDPI, vol. 16(7), pages 1-28, April.
    6. Wan, Jianlong & Zhao, Haibo, 2017. "Dynamics of premixed CH4/air flames in a micro combustor with a plate flame holder and preheating channels," Energy, Elsevier, vol. 139(C), pages 366-379.
    7. Rana, Uttam & Chakraborty, Suman & Som, S.K., 2017. "Prediction of flame speed and exergy analysis of premixed flame in a heat recirculating cylindrical micro combustor," Energy, Elsevier, vol. 126(C), pages 658-670.
    8. Zuo, Wei & E, Jiaqiang & Hu, Wenyu & Jin, Yu & Han, Dandan, 2017. "Numerical investigations on combustion characteristics of H2/air premixed combustion in a micro elliptical tube combustor," Energy, Elsevier, vol. 126(C), pages 1-12.
    9. Wan, Jianlong & Fan, Aiwu & Yao, Hong & Liu, Wei, 2015. "Effect of pressure on the blow-off limits of premixed CH4/air flames in a mesoscale cavity-combustor," Energy, Elsevier, vol. 91(C), pages 102-109.
    10. Fan, Aiwu & Zhang, He & Wan, Jianlong, 2017. "Numerical investigation on flame blow-off limit of a novel microscale Swiss-roll combustor with a bluff-body," Energy, Elsevier, vol. 123(C), pages 252-259.
    11. Veeraragavan, Ananthanarayanan, 2015. "On flame propagation in narrow channels with enhanced wall thermal conduction," Energy, Elsevier, vol. 93(P1), pages 631-640.
    12. Arjmandi, H.R. & Amani, E., 2015. "A numerical investigation of the entropy generation in and thermodynamic optimization of a combustion chamber," Energy, Elsevier, vol. 81(C), pages 706-718.

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