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Flame characteristics and NO emission in methane/air-air counterflow premixed flames with applying FIR and FGR

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Abstract

Numerical study was conducted to grasp flame characteristics and NO emission behaviors in CH4/air-air premixed counterflow flames with applying Fuel induced recirculation (FIR) and Flue gas recirculation (FGR) with CO2 and H2O by varying global strain rate and the ratios of FIR and FGR. Chemical effects of additional CO2 and H2O via FIR and FGR were analyzed through comparing flame characteristics and NO behaviors from real species (CO2 and H2O) with those from their artificial species (XCO2 and XH2O) which have the same thermochemical, radiative, and transport properties to those for the real species. The results showed that flame temperature and NO emission with FIR varied much more sensitively than that with FGR. Those varied little via FIR with CO2 and H2O as well as XCO2 and XH2O. However, those varied complicatedly by chemical effects of added CO2 and H2O via FGR. In particular, there is a critical ratio of FGR below which NO emission index can be larger than those without applying FGR. Detailed analyses for them were made and discussed.

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Authors and Affiliations

  1. Dept. of Mechanical Engineering, Myongji University, Yongin, Korea

    In Gweon Lim

  2. Dept. of Mechanical Engineering, Pukyong National University, Busan, Korea

    Jeong Park

Authors
  1. In Gweon Lim
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  2. Jeong Park
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Correspondence to Jeong Park.

Additional information

Recommended by Associate Editor Yong Tae Kang

In Gweon Lim holds a Ph.D. degree (1992) at Univ. of Texas at Austin. He joined Myongji Univ. in 1993. Now he is a business director in Korean Society of Combustion.

Jeong Park holds a Ph.D. degree (1995) at KAIST. He joined the KARI as a senior researcher. He taught and studied the general area of flame structure at Sunchon National Univ. (2000-2007), and then joined Pukyong National Univ. in 2007. Now he is a vice-president in The Korean Society of Microgravity and in Korean Society of Combustion as well as an editorial board in Int. J. Spray and Combution Dynamics.

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Lim, I.G., Park, J. Flame characteristics and NO emission in methane/air-air counterflow premixed flames with applying FIR and FGR. J Mech Sci Technol 30, 3869–3876 (2016). https://doi.org/10.1007/s12206-016-0752-y

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  • DOI: https://doi.org/10.1007/s12206-016-0752-y

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