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A numerical study on the ability to predict the heat release rate using CH* chemiluminescence in non-sooting counterflow diffusion flames

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タイトル: A numerical study on the ability to predict the heat release rate using CH* chemiluminescence in non-sooting counterflow diffusion flames
著者: Hossain, Akter 著作を一覧する
Nakamura, Yuji 著作を一覧する
キーワード: Chemiluminescence
Excited state radical (CH*)
Diffusion flame
Flame diagnostics
発行日: 2014年 1月
出版者: Elsevier science inc
誌名: Combustion and flame
巻: 161
号: 1
開始ページ: 162
終了ページ: 172
出版社 DOI: 10.1016/j.combustflame.2013.08.021
抄録: Numerical studies on 1-D, non-sooting counterflow diffusion flames were performed to determine the precision with which the total heat release rate can be calculated using light emission, namely, chemiluminescence, from the reaction zone. A detailed reaction mechanism, incorporating sub-reaction models for excited state radicals (CH* and OH*, where * denotes the excited state), was employed in this study. A set of 1-D, steady state conservation equations was solved under standard atmospheric conditions over a counterflow configuration utilizing the CHEMKIN-PRO package. A variety of fuels (CH4 and C3H8), velocities (0.1 m/s - near the extinction condition), diluents (N-2, H2O, CO2, and Ar), detailed reaction mechanisms for C-1-C-3 hydrocarbons (GRI-Mech 3.0, Hai Wang's-, and San Diego-mechanism), different subreaction models for excited radicals, and excited radical transport properties were examined for the current purpose. It was found that a one-to-one correlation between total chemiluminescence from CH* and the total heat release rate cannot be sustained when the flame experiences a relatively high stretch and dilution, even though the condition is still far away from extinction. This trend is consistent with the different types of fuels, and it is understood that the reduction of the ethynyl radical (C2H), a potential precursor of CH*, is the main cause of the one-to-one correlation not being sustained. To this end, it was concluded that the observable light emission can only be used to predict the total heat release rate when non-sooting diffusion flames exist under velocity conditions from 0.1 m/s to 1.5 m/s. In other words, the chemiluminescence intensity does not always correlate with the total heat release rate of highly stretched flames found in practical combustors. (C) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/54632
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 中村 祐二

 

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