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research-article

Effects of CO2 Addition on the Turbulent Flame Front Dynamics and Propagation Speeds of Methane/Air Mixtures

[+] Author and Article Information
Christopher Reuter

Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08540
cbreuter@princeton.edu

Sang Hee Won

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208
sanghee@mailbox.sc.edu

Yiguang Ju

Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08540
yju@princeton.edu

1Corresponding author.

ASME doi:10.1115/1.4040518 History: Received July 26, 2017; Revised February 01, 2018

Abstract

Exhaust gas recirculation is one of the most promising methods of improving the performance of power-generating gas turbines. CO2 is known to have the largest impact on flame behavior of any major exhaust species, but few studies have specified its thermal, kinetic, and transport effects on turbulent flames. Therefore, in this study, methane/air mixtures diluted with CO2 are experimentally investigated in a reactor-assisted turbulent slot (RATS) burner using OH planar laser-induced fluorescence measurements. CO2 addition is tested under both constant adiabatic flame temperature and variable adiabatic flame temperature conditions in order to elucidate its thermal, kinetic, and transport effects. Particular attention is paid to CO2's effects on the flame surface density, progress variable, turbulent burning velocity, and flame wrinkling. The experimental measurements reveal that CO2's thermal effects are the dominant factor in elongating the turbulent flame brush and decreasing the turbulent burning velocity. When thermal effects are removed by holding the adiabatic flame temperature constant, CO2's kinetic effects are the next most important factor, producing an approximately 5% decrease in the global consumption speed for each 5% of CO2 addition. The transport effects of CO2, however, tend to increase the global consumption speed, counteracting 30-50% of the kinetic effects when the adiabatic flame temperature is fixed. It is also seen that CO2 addition increases the normalized global consumption speed through an enhancement of the stretch factor and not through an increase in the flame wrinkling.

Copyright (c) 2018 by ASME
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