Turbulent burning velocity of hydrogen-air premixed propagating flames at elevated pressures

Toshiaki Kitagawa, Takashi Nakahara, Kosuke Maruyama, Kunihiro Kado, Akihiro Hayakawa, Shoichi Kobayashi

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Lewis number represents the thermo-diffusive effects on laminar flames. That of hydrogen-air mixture varies extensively with the equivalence ratio due to the high molecular diffusivity of hydrogen. In this study, the influences of pressure and thermo-diffusive effects on spherically propagating premixed hydrogen-air turbulent flames were studied using a constant volume fan-stirred combustion vessel. It was noted that the ratio of the turbulent to unstretched laminar burning velocity increased with decreasing equivalence ratio and increasing mixture pressure. Turbulent burning velocity was dominated by three factors: (1) purely hydrodynamic factor, turbulence Reynolds number, (2) relative turbulence intensity to reaction speed, the ratio of turbulence intensity to unstretched laminar burning velocity, and (3) sensitivity of the flame to the stretch due to the thermo-diffusive effects, Lewis and Markstein numbers. A turbulent burning velocity correlation in terms of Reynolds and Lewis numbers is presented.

Original languageEnglish
Pages (from-to)5842-5849
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume33
Issue number20
DOIs
Publication statusPublished - 2008 Oct 1
Externally publishedYes

Keywords

  • Burning velocity
  • Combustion
  • Effect of pressure
  • Hydrogen
  • Lewis number
  • Markstein number
  • Premixed turbulent flame

ASJC Scopus subject areas

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

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