Near-field local flame extinction of oxy-syngas non-premixed jet flames: A DNS study

FUEL

卷:130

Article

Dinesh, K. K. J. Ranga¹  van Oijen, J. A.²  Luo, K. H.^3,4  Jiang, X.⁵ 

[1] Univ Southampton, Fac Engn & Environm, Energy Technol Res Grp, Southampton SO17 1BJ, Hants, England

[2] Eindhoven Univ Technol, Dept Mech Engn, NL-5600 MB Eindhoven, Netherlands

[3] UCL, Dept Mech Engn, London WC1E 7JE, England

[4] Tsinghua Univ, Dept Thermal Engn, Ctr Combust Energy, Key Lab Thermal Sci & Power Engn,Minist Educ, Beijing 100084, Peoples R China

[5] Univ Lancaster, Dept Engn, Lancaster LA1 4YR, England

关键词: DNS;    Oxy-syngas flame;    Syngas-air flame;    Probability density functions;    Fully burning probability;   

DOI  :  10.1016/j.fuel.2014.04.011

来源: Elsevier

【 摘 要 】

An investigation of the local flame extinction of H-2/CO oxy-syngas and syngas-air nonpremixed jet flames was carried out using three-dimensional direct numerical simulations (DNS) with detailed chemistry by using flamelet generated manifold chemistry (FGM). The work has two main objectives: identify the influence of the Reynolds number on the oxy-syngas flame structure, and to clarify the local flame extinction of oxy-syngas and syngas-air flames at a higher Reynolds number. Two oxy-syngas flames at Reynolds numbers 3000 and 6000 and one syngas-air flame at Reynolds number 6000 were simulated. The scattered data, probability density function distributions and fully burning probability provide the local flame characteristics of oxy-syngas and syngas-air nonpremixed jet flames. It is found that the H-2/CO oxy-syngas flame burns well compared to the syngas-air flame and the high Reynolds number causes more flow straining, resulting in higher scalar dissipation rates which lead to lower temperatures and eventually local flame extinction. The oxy-syngas flames burns more vigorously than the syngas-air flame with the same adiabatic flame temperature of approximately 2400 K. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.

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