Experimental study on laminar flame speed of H2/CH4/air mixtures

doi:10.16265/j.cnki.issn1003-3033.2019.11.017

Abstract

Abstract: To obtain the accurate measurement of laminar flame speed of H₂/CH₄/air mixtures, the laminar flame speeds were experimentally studied using Bunsen burner method incorporating two picture techniques of schlieren system and visible natural light system. According to the chemical dynamics mechanism, the laminar flame propagation characteristics of premixed fuel with different hydrogen fractions were simulated and calculated in order to investigate the influence of hydrogen fractions on the laminar premixed flame of H₂/CH₄/air mixtures. The results show that the method-independent laminar flame speeds of H₂/CH₄/air mixtures obtained by schlieren system are more equivalent to the laminar flame speed defined by the theory of combustion, that both the laminar flame speed and adiabatic flame temperature of H₂/CH₄/air mixtures increase with the growth of hydrogen fractions, that the equivalence ratio with the peak flame speed moves to the fuel-rich side by means of addition of hydrogen, and that with the continuous increase of hydrogen fractions, the mole fractions of vital radical H and the formation rate of OH radical rise significantly.

Key words: laminar flame, Bunsen burner, schlieren system, flame edge recognition, hydrogen fraction, sensitivity analysis

CLC Number:

X932

SHANG Rongxue, YANG Yue, GAO Junhao, LI Gang. Experimental study on laminar flame speed of H₂/CH₄/air mixtures[J]. China Safety Science Journal, 2019, 29(11): 103-108.

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Experimental study on laminar flame speed of H₂/CH₄/air mixtures

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