Effect of H2O addition on Downstream Interaction in CO-O2 Premixed Flames

Gyeong Taek Kim; Chun Sang Yoo; Jeong Park; Suk Ho Chung; Oh Boong Kwon

doi:10.15231/jksc.2022.27.1.001

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2022 Vol.27, Issue 1 Next Page

Research Article

Effect of H₂O addition on Downstream Interaction in CO-O₂ Premixed Flames CO-O₂ 예혼합화염의 후류상호작용에 관한 H₂O 첨가 효과

31 March 2022. pp. 1-8

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Abstract

Numerical study is conducted to understand the effects of additional H₂O on downstream interaction in CO-O₂ counterflow premixed flames. Adding 1% H₂O to fuel side for freely-propagating premixed flame with CO-O₂ mixture increases laminar burning velocity from 5.3 cm/s to 81.8 cm/s in a way that the main oxidation reaction is changed from CO + 0.5O₂ → CO₂ to CO + OH → CO₂ + H. When global strain rate reaches 23.5 s-1 for interacting CO-O₂ premixed flames, the flames cannot be sustained. While for (0.1% H₂O + CO)-O₂ premixed flames, the flame is extinguished at 2687 s-1. Because the fuel Lewis number and effective one are larger than unity, downstream interaction are mainly through chemical one. For lean-lean (rich-rich) flames, the production of O (H) radical is vigorous, resulting in the formation of OH via H₂O + O → OH + OH (H₂O + H → OH + H₂). These different chemical situations can influence downstream interactions in various flame configurations. Such interesting aspects in chemical interactions are presented and discussed in detail.

Keywords

Downstream interaction

Chemical effect

Flame extinction

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Information

Publisher :The Korean Society Combustion
Publisher(Ko) :한국연소학회
Journal Title :Journal of The Korean Society Combustion
Journal Title(Ko) :한국연소학회지
Volume : 27
No :1
Pages :1-8
Received Date : 2022-01-17
Revised Date : 2022-01-25
Accepted Date : 2022-02-02
DOI :https://doi.org/10.15231/jksc.2022.27.1.001

Journal of The Korean Society Combustion ISSN:1226-0959(Print) 2466-2089(Online) 한국연소학회지

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