Measurement of laminar burning velocities and analysis of flame stabilities for hydrogen-air-diluent premixed mixtures

Erjiang Hu, Zuohua Huang, Jiajia He, Chun Jin, Haiyan Miao, Xibin Wang

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The laminar burning velocities and Markstein lengths of the hydrogen-air-diluent mixtures were measured at different equivalence ratios (0.4-1.5), different diluents (N2, CO2 and 15%CO 2+85%N2) and dilution ratios (0, 0.05, 0.10 and 0.15) by using the outwardly expanding flame. The influences of flame stretch rate on the flame propagation characteristics were analyzed. The results show that both the laminar burning velocities and the Markstein lengths of the hydrogen-air-diluent mixtures decrease with the increase of dilution ratio. The decrease in Markstein lengths means that adding diluents into the hydrogen-air mixtures will decrease the diffusional-thermal instability of the flame front. For a specified dilution ratio, the laminar burning velocities give their maximum values at an equivalence ratio of 1.8. The Markstein lengths increase with the increase of the equivalence ratio monotonously regardless of the diluents. The study shows that CO2 as the diluent has a greater impact on the laminar flame speed and the flame front stability than N 2 as the diluent.

Original languageEnglish
Pages (from-to)846-857
Number of pages12
JournalChinese Science Bulletin
Volume54
Issue number5
Early online date26 Feb 2009
DOIs
Publication statusPublished - 1 Mar 2009
Externally publishedYes

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