Effects of hydrogen concentration on the emission and heat transfer of a premixed LPG-hydrogen flame

H. S. Zhen, Chun Shun Cheung, Chun Wah Leung, Yat Sze Choy

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)


This paper describes an experimental study of the effect of hydrogen concentration on the emission and heat transfer characteristics of a laminar premixed LPG-hydrogen flame. The mole fraction of hydrogen in the fuel mixture was varied from 0% to 50%. The equivalence ratio of the fuel/air mixture was kept at stoichiometry and the mixture jet Reynolds number was fixed at Re = 1500 for most of the tests. The results show that upon varying hydrogen content in the fuel mixture, there is a corresponding change in the appearance, pollutant emissions and heat transfer characteristics of the flame. As the volume flow rate of the fuel/air mixture was increased at higher hydrogen concentration, the height of the inner reaction cone reduced monotonically, indicative of an increase in the laminar burning speed of the mixture. Also, the flame temperature increased, the CO emission decreased and the NOxemission increased. Due to the shortened flame length and enhanced flame temperature, the maximum stagnation point heat flux increased with its position shifting closer to the burner exit at higher hydrogen concentration. Similarly, the maximum total heat transfer rate occurred at smaller nozzle-to-plate distance and the heat transfer was enhanced. Published by Elsevier Ltd. All rights.
Original languageEnglish
Pages (from-to)6097-6105
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number7
Publication statusPublished - 1 Apr 2012


  • Flame impingement heat transfer
  • LPG-H hybrid fuel 2
  • Pollutant emissions

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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