Flame Propagation in CH4/H2/O2 Blended Mixtures in Smooth Tubes of Millimeter-Scale

Yao Chung Hsu; Yei Chin Chao; Kung Ming Chung

doi:10.1080/00102202.2016.1177033

Flame Propagation in CH₄/H₂/O₂ Blended Mixtures in Smooth Tubes of Millimeter-Scale

Yao Chung Hsu, Yei Chin Chao, Kung Ming Chung

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

There are few studies of flame propagation and the initiation of detonation for blended mixtures. In this article, an experimental study is conducted to investigate the acceleration of a flame in stoichiometric methane/hydrogen/oxygen (CH₄/H₂/O₂) mixtures in millimeter-scale smooth tubes. In the 1.0- and 1.5-mm tubes, there is no flame acceleration or detonation initiation. The flame propagates at a speed of several m/s. This may occur because of the heat loss on a non-adiabatic wall and the condensation of water vapor. When the molar fraction of CH₄ in a 3.0-mm tube is larger than 0.3, detonation is initiated. The early stage of flame propagation is divided into propagation at a constant velocity, deceleration, and exponential acceleration. An increase in the molar fraction of CH₄ induces a pulsating propagation of a flame.

Original language	English
Pages (from-to)	1239-1248
Number of pages	10
Journal	Combustion science and technology
Volume	188
Issue number	8
DOIs	https://doi.org/10.1080/00102202.2016.1177033
Publication status	Published - 2016 Aug 2

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Fuel Technology
Energy Engineering and Power Technology
Physics and Astronomy(all)

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10.1080/00102202.2016.1177033

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title = "Flame Propagation in CH4/H2/O2 Blended Mixtures in Smooth Tubes of Millimeter-Scale",

abstract = "There are few studies of flame propagation and the initiation of detonation for blended mixtures. In this article, an experimental study is conducted to investigate the acceleration of a flame in stoichiometric methane/hydrogen/oxygen (CH4/H2/O2) mixtures in millimeter-scale smooth tubes. In the 1.0- and 1.5-mm tubes, there is no flame acceleration or detonation initiation. The flame propagates at a speed of several m/s. This may occur because of the heat loss on a non-adiabatic wall and the condensation of water vapor. When the molar fraction of CH4 in a 3.0-mm tube is larger than 0.3, detonation is initiated. The early stage of flame propagation is divided into propagation at a constant velocity, deceleration, and exponential acceleration. An increase in the molar fraction of CH4 induces a pulsating propagation of a flame.",

author = "Hsu, {Yao Chung} and Chao, {Yei Chin} and Chung, {Kung Ming}",

note = "Funding Information: The authors gratefully acknowledge the financial support by the Ministry of Science and Technology (MOST 100-2623-E-006-015-D). Publisher Copyright: {\textcopyright} 2016 Taylor & Francis.",

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AB - There are few studies of flame propagation and the initiation of detonation for blended mixtures. In this article, an experimental study is conducted to investigate the acceleration of a flame in stoichiometric methane/hydrogen/oxygen (CH4/H2/O2) mixtures in millimeter-scale smooth tubes. In the 1.0- and 1.5-mm tubes, there is no flame acceleration or detonation initiation. The flame propagates at a speed of several m/s. This may occur because of the heat loss on a non-adiabatic wall and the condensation of water vapor. When the molar fraction of CH4 in a 3.0-mm tube is larger than 0.3, detonation is initiated. The early stage of flame propagation is divided into propagation at a constant velocity, deceleration, and exponential acceleration. An increase in the molar fraction of CH4 induces a pulsating propagation of a flame.

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Flame Propagation in CH₄/H₂/O₂ Blended Mixtures in Smooth Tubes of Millimeter-Scale

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