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Comparison of the premixed flame dynamics of CH4/O2/CO2 mixtures in closed and half-open ducts by Feixiang Zhong; Ligang Zheng; Jianlei Zhang; Xi Wang; Zhanwang Shi; Yuxin Miao; Jian Wang is a Engineering article available to read on EtoBox.

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The premixed flame dynamics of CH 4 /O 2 /CO 2 mixtures ignited in two duct configurations, i.e., both ends closed and half-open (open at one end and closed at the opposite end), were investigated. The influence of the combustion-generated gas compression on the chemical kinetics was analyzed. The results show that CH 4 /O 2 / CO 2 mixtures formed thrice distorted tulip flames (DTF) in the closed duct. The shortened time scale β impairs the interaction between the flame front and the Rayleigh-Taylor instability, resulting in the gradual reduction of the flame distortion degree. Moreover, the deeper primary cusps generated by the stronger Darrieus-Landau instability is favorable for forming a distorted tulip flame with more times of distortions. The duct configuration exerts a significant influence on the relationship between the maximum flame velocity (V max ) and pressure (P max ) versus the peak mole fraction [H + O + OH] max . The higher flow velocity of unburned gas induced by the duct-venting and the expansion waves generated by the collapses of secondary cusps as an additional contribution promote the flame velocity for the half-open duct and the pressure rise for the closed

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Author

Feixiang Zhong; Ligang Zheng; Jianlei Zhang; Xi Wang; Zhanwang Shi; Yuxin Miao; Jian Wang

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)