NO formation/reduction mechanisms of ammonia/air premixed flames at various equivalence ratios and pressures
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- HAYAKAWA Akihiro
- Institute of Fluid Science, Tohoku University
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- GOTO Takashi
- Institute of Fluid Science, Tohoku University
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- MIMOTO Rentaro
- Institute of Fluid Science, Tohoku University
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- KUDO Taku
- Institute of Fluid Science, Tohoku University
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- KOBAYASHI Hideaki
- Institute of Fluid Science, Tohoku University
抄録
Ammonia is a carbon-free fuel and its application to internal combustion engines is expected. However, few studies on ammonia flames, especially at high pressures, have been carried out because ammonia has not been considered to be a fuel owing to its lower combustion intensity. Most of NOx, which is formed by ammonia combustion, is considered to be the fuel NOx. The objectives of this study were to investigate the fundamental characteristics of NOx experimentally, such as NO emission and chemiluminescence of ammonia/air flames not only at the atmospheric pressure but also under high pressures and to explore NO formation/reduction mechanisms using numerical simulation. Experiments were carried out using a nozzle-type burner. NH2 ammonia α band spectra were observed, and it was clarified that the color of ammonia flame is mainly determined by the NH2 ammonia α band and H2O spectra. Burned gas was sampled from ammonia flame stabilized at the burner. The mole fraction of NO decreased with the increase in equivalence ratio at atmospheric pressure. Reaction flow analysis was performed, and it was clarified that the decrease in the mole fraction of NO for rich mixtures was caused by NHi (i = 2, 1, 0). High pressure experiments were performed using a high pressure combustion facility for stoichiometric ammonia flame. Consequently, the decrease in the mole fraction of NO was experimentally observed and its tendency was found to qualitatively agree with the results of the numerical simulation. It was clarified that the third body reaction of OH + H + M ⇔ H2O + M plays an important role in the reduction of the mole fraction of NO at the high pressure.
収録刊行物
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- Mechanical Engineering Journal
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Mechanical Engineering Journal 2 (1), 14-00402-14-00402, 2015
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390001205514654592
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- NII論文ID
- 130005005380
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- ISSN
- 21879745
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可