Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames*

Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (5): 914-922.

Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*

陈珊珊, 蒋勇, 邱榕, 安江涛

State Key Laboratory of Fire Science, University of Science and Technology, Hefei 230026, China

收稿日期:2011-06-21 修回日期:2011-10-20 出版日期:2012-10-28 发布日期:2012-11-06
通讯作者: JIANG Yong,E-mail:yjjiang@ustc.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (51176181);the National Basic Research Program of China (2012CB719704)

Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*

CHEN Shanshan, JIANG Yong, QIU Rong, AN Jiangtao

State Key Laboratory of Fire Science, University of Science and Technology, Hefei 230026, China

Received:2011-06-21 Revised:2011-10-20 Online:2012-10-28 Published:2012-11-06
Supported by:
Supported by the National Natural Science Foundation of China (51176181);the National Basic Research Program of China (2012CB719704)

摘要/Abstract

摘要： A numerical study on premixed methane/ethylene/air flames with various ethylene fractions and equivalence ratios was conducted at room temperature and atmospheric pressure. The effects of ethylene addition on laminar burning velocity, flame structure and flame stability under the condition of lean burning were investigated. The results show that the laminar burning velocity increases with ethylene fraction, especially at a large equivalence ratio. More ethylene addition gives rise to higher concentrations of H, O and OH radicals in the flame, which significantly promotes chemical reactions, and a linear correlation exists between the laminar burning velocity and the maximum H+OH concentration in the reaction zone. With the increase of ethylene fraction, the adiabatic flame temperature is raised, while the inner layer temperature becomes lower, contributing to the enhancement of combustion. Markstein length and Markstein number, representative of the flame stability, increase as more ethylene is added, indicating the tendency of flame stability to improve with ethylene addition.

关键词: laminar burning velocity, flame stability, methane, ethylene

Abstract: A numerical study on premixed methane/ethylene/air flames with various ethylene fractions and equivalence ratios was conducted at room temperature and atmospheric pressure. The effects of ethylene addition on laminar burning velocity, flame structure and flame stability under the condition of lean burning were investigated. The results show that the laminar burning velocity increases with ethylene fraction, especially at a large equivalence ratio. More ethylene addition gives rise to higher concentrations of H, O and OH radicals in the flame, which significantly promotes chemical reactions, and a linear correlation exists between the laminar burning velocity and the maximum H+OH concentration in the reaction zone. With the increase of ethylene fraction, the adiabatic flame temperature is raised, while the inner layer temperature becomes lower, contributing to the enhancement of combustion. Markstein length and Markstein number, representative of the flame stability, increase as more ethylene is added, indicating the tendency of flame stability to improve with ethylene addition.

Key words: laminar burning velocity, flame stability, methane, ethylene

陈珊珊, 蒋勇, 邱榕, 安江涛. Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*[J]. Chinese Journal of Chemical Engineering, 2012, 20(5): 914-922.

CHEN Shanshan, JIANG Yong, QIU Rong, AN Jiangtao. Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*[J]. Chin.J.Chem.Eng., 2012, 20(5): 914-922.

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Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*

Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*

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