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research-article

Effect of CO2/N2 Dilution on Flame Stability in a Premixed Methane-Air Flame under Strained Condition

[+] Author and Article Information
Joseph Feser

Research Assistant, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
jfeser@terpmail.umd.edu

Ashwani K. Gupta

Distinguished University Professor, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
akgupta@umd.edu

1Corresponding author.

ASME doi:10.1115/1.4039326 History: Received December 01, 2017; Revised January 19, 2018

Abstract

The effects of adding N2 or CO2 as diluents to a premixed methane-air flames under strain conditions (associated with a stagnation plate) was 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 (UHC). 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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