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Research Papers: Fuel Combustion

Effect of CO2/N2 Dilution on Premixed Methane–Air Flame Stability Under Strained Conditions

[+] Author and Article Information
Joseph S. Feser

Department of Mechanical Engineering,
University of Maryland,
College Park, MD 20742
e-mail: jfeser@terpmail.umd.edu

Ashwani K. Gupta

Professor
Department of Mechanical Engineering,
University of Maryland,
College Park, MD 20742
e-mail: akgupta@umd.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 1, 2017; final manuscript received January 19, 2018; published online March 29, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 140(7), 072207 (Mar 29, 2018) (5 pages) Paper No: JERT-17-1671; doi: 10.1115/1.4039326 History: Received December 01, 2017; Revised January 19, 2018

The effects of adding N2 or CO2 as diluents to a premixed methane–air flames under strain conditions (associated with a stagnation plate) were examined for flame stand-off distance, stability, intensity, and global flame behavior at various equivalence ratios. A stagnation plate was used to simulate the flame behavior near a combustor wall that can help provide some insights into reducing thermal stresses and enhance combustor lifetime. Decrease in equivalence ratio at the same thermal intensity provided larger strain rates while maintaining a stable flame. At stoichiometric condition, a balance was provided between high strain rates and low oxygen concentration flames to mitigate the peak (maximum) flame temperatures, and the associated temperature-dependent pollutants emission, such as NOx, CO, and unburnt hydrocarbons. Higher thermal intensities provided higher strain rates; however, the addition of diluents impacted in destabilization of flame. The flame stand-off behavior occurred at lower strain rates, low thermal intensity, and increased equivalence ratios. CO2 dilution reduced flame intensity, increased flame stand-off distance and overall flame destabilization than that with N2 dilution.

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Figures

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Fig. 1

Schematic of experimental setup

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Fig. 2

OH* chemiluminescence signal showing effect of thermal intensity with N2 dilution and constant ϕ = 1: left—case 4, middle—case 5, and right—case 6

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Fig. 3

OH* chemiluminescence signal showing effect of equivalence ratio with N2 dilution and constant CH4 flowrate = 4.58 L/min: left—case 2; middle—case 5; and right—case 8

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Fig. 4

OH* chemiluminescence signal showing effect of thermal intensity with CO2 dilution and constant ϕ = 1: left—case 4, middle—case 5, and right—case 6

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Fig. 5

OH* chemiluminescence signal showing effect of equivalence ratio with CO2 dilution and constant CH4 flowrate = 4.58 L/min: left—case 2, middle—case 5, and right—case 8

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Fig. 6

Effect of axial strain rate on flame intensity: (a) cases—1, 4, 7; (b) cases—2, 5, 8; and (c) cases—3, 6, 9; open symbols—N2; closed symbols—CO2; squares—ϕ = 0.8; circles—ϕ = 1.0; triangles—ϕ = 1.2

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Fig. 7

Effect of axial strain rate on flame stand-off distance: (a) cases—1, 4, 7; (b) cases—2, 5, 8; and (c) cases—3, 6, 9; open symbols—N2; closed symbols—CO2; squares—ϕ = 0.8; circles—ϕ = 1.0; triangles—ϕ = 1.2

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