Influence of initial pressure on flame propagation characteristics of natural gas-hydrogen-air mixture

Qi Jiao, Hai Yan Miao, Qian Huang, Zuo Hua Huang, De Ming Jiang, Ke Zeng

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Flame propagation of natural gas-hydrogen-air mixture under various initial pressures was studied in a constant volume combustion bomb using a high-speed schlieren photography system. Laminar burning velocities and mass burning fluxes were obtained at various initial pressures, hydrogen fractions and equivalence ratios. Flame stability and the influencing factors (Markstein length, density ratios and flame thickness) were also analyzed using the flame images at various hydrogen fractions, initial pressures and equivalence ratios. The results show that hydrogen fractions, initial pressures and equivalence ratios have combined influence on both un-stretched laminar burning velocity and flame instability. According to the flame propagation pictures taken by high-speed camera, flame stability decreases with the increase of initial pressure. For mixtures with a fixed equivalence ratio and hydrogen fraction, variation of initial pressure has less influence on density ratio than on flame thickness.

Original languageEnglish
Pages (from-to)374-380
Number of pages7
JournalRanshao Kexue Yu Jishu/Journal of Combustion Science and Technology
Volume15
Issue number4
Publication statusPublished - 1 Aug 2009
Externally publishedYes

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