Turbulent burning velocity of ammonia/oxygen/nitrogen premixed flame in O2-enriched air condition

FUEL

卷:268

Article

Xia, Yu¹  Hashimoto, Genya¹  Hadi, Khalid^1,3  Hashimoto, Nozomu¹  Hayakawa, Akihiro²  Kobayashi, Hideaki²  Fujita, Osamu¹ 

[1] Hokkaido Univ, Div Mech & Space Engn, Kita Ku, Kita13 Nishi8, Sapporo, Hokkaido 0608628, Japan

[2] Tohoku Univ, Inst Fluid Sci, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

[3] Politekn Sultan Azlan Shah, Mech Engn Dept, Behrang 35950, Perak, Malaysia

关键词: Premixed ammonia/oxygen/nitrogen flame;    Turbulent burning velocity;    Laminar burning velocity;    O-2-enriched combustion;   

DOI  :  10.1016/j.fuel.2020.117383

来源: Elsevier

【 摘 要 】

Ammonia is a promising hydrogen-energy carrier as well as a carbon-free fuel. However, turbulent burning behavior of ammonia flame had yet to be sufficiently studied. In this work, laminar and turbulent burning velocities of ammonia/oxygen/nitrogen flames were investigated under the condition of oxygen enrichment. The turbulent burning velocity of ammonia/oxygen/nitrogen mixtures was found to increase with increasing turbulence intensity. The ratio of the turbulent burning velocity to stretched laminar burning velocity, Utr/UN, increased with the turbulence Karlovitz number. However, because of the diffusional-thermal instability effect, given the same turbulent Karlovitz numbers, Utr/UN in ammonia-lean cases is larger than in ammonia-rich cases. These findings indicate that consideration of the effects of diffusional-thermal instability and of the turbulence is important for the prediction of turbulent flame propagation velocity in ammonia combustion fields.

【 授权许可】

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