SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (2): 403-413.DOI: 10.1016/j.cjche.2019.05.002

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

A novel combined baffle-cavity micro-combustor configuration for Micro-Thermo-Photo-Voltaic applications

E. Amani, A. Daneshgar, A. Hemmatzade   

  1. Mechanical Engineering Dept., Amirkabir University of Technology, Tehran, Iran
  • 收稿日期:2019-02-11 修回日期:2019-04-22 出版日期:2020-02-28 发布日期:2020-05-21
  • 通讯作者: E. Amani, A. Daneshgar, A. Hemmatzade

A novel combined baffle-cavity micro-combustor configuration for Micro-Thermo-Photo-Voltaic applications

E. Amani, A. Daneshgar, A. Hemmatzade   

  1. Mechanical Engineering Dept., Amirkabir University of Technology, Tehran, Iran
  • Received:2019-02-11 Revised:2019-04-22 Online:2020-02-28 Published:2020-05-21
  • Contact: E. Amani, A. Daneshgar, A. Hemmatzade

摘要: The major issues of Micro-Thermo-Photo-Voltaic (MTPV) micro-combustors are flame instabilities, which narrow the operational range, and non-uniform wall temperature, which lowers the overall efficiency. The purpose of the present research is to propose a novel micro-combustor with combined baffle and cavity configuration to address these issues. For this aim, a numerical modeling approach is validated and used. The performance of the improved combustor is compared with another recent baffle-bluff configuration. It is shown that the novel design improves the average wall temperature by 36.4 K and mitigates its standard deviation by 13.4 K. Moreover, using the optimal baffle thickness, these enhancements can be augmented by 4% raise of average wall temperature, 62% increase of temperature uniformity, and 20% reduction in overall emission. The baffle length of 0.6 times the combustor length and thickness of 0.0625 times the baffle spacing result in the optimal operation due to the flame lift-off in the upstream direction. According to the sensitivity analysis, the most effective geometrical parameters are the baffle length and thickness. It is expected that using this novel micro-combustor with optimized design parameters improves the overall efficiency of MTPV systems.

关键词: Microscale, Computational Fluid Dynamics (CFD), Reaction, Micro-combustion, Micro-Thermo-Photo-Voltaic (MTPV), Emission

Abstract: The major issues of Micro-Thermo-Photo-Voltaic (MTPV) micro-combustors are flame instabilities, which narrow the operational range, and non-uniform wall temperature, which lowers the overall efficiency. The purpose of the present research is to propose a novel micro-combustor with combined baffle and cavity configuration to address these issues. For this aim, a numerical modeling approach is validated and used. The performance of the improved combustor is compared with another recent baffle-bluff configuration. It is shown that the novel design improves the average wall temperature by 36.4 K and mitigates its standard deviation by 13.4 K. Moreover, using the optimal baffle thickness, these enhancements can be augmented by 4% raise of average wall temperature, 62% increase of temperature uniformity, and 20% reduction in overall emission. The baffle length of 0.6 times the combustor length and thickness of 0.0625 times the baffle spacing result in the optimal operation due to the flame lift-off in the upstream direction. According to the sensitivity analysis, the most effective geometrical parameters are the baffle length and thickness. It is expected that using this novel micro-combustor with optimized design parameters improves the overall efficiency of MTPV systems.

Key words: Microscale, Computational Fluid Dynamics (CFD), Reaction, Micro-combustion, Micro-Thermo-Photo-Voltaic (MTPV), Emission