Exhaust gas recirculation (EGR) 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 (PLIF) 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 primarily through an enhancement of the stretch factor.
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January 2019
Research-Article
Effects of CO2 Addition on the Turbulent Flame Front Dynamics and Propagation Speeds of Methane/Air Mixtures
Christopher B. Reuter,
Christopher B. Reuter
Department of Mechanical and Aerospace
Engineering,
Princeton University,
Princeton, NJ 08540
e-mail: cbreuter@princeton.edu
Engineering,
Princeton University,
Princeton, NJ 08540
e-mail: cbreuter@princeton.edu
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Sang Hee Won,
Sang Hee Won
Department of Mechanical Engineering,
University of South Carolina,
Columbia, SC 29208
e-mail: sanghee@mailbox.sc.edu
University of South Carolina,
Columbia, SC 29208
e-mail: sanghee@mailbox.sc.edu
Search for other works by this author on:
Yiguang Ju
Yiguang Ju
Department of Mechanical and
Aerospace Engineering,
Princeton University,
Princeton, NJ 08540
e-mail: yju@princeton.edu
Aerospace Engineering,
Princeton University,
Princeton, NJ 08540
e-mail: yju@princeton.edu
Search for other works by this author on:
Christopher B. Reuter
Department of Mechanical and Aerospace
Engineering,
Princeton University,
Princeton, NJ 08540
e-mail: cbreuter@princeton.edu
Engineering,
Princeton University,
Princeton, NJ 08540
e-mail: cbreuter@princeton.edu
Sang Hee Won
Department of Mechanical Engineering,
University of South Carolina,
Columbia, SC 29208
e-mail: sanghee@mailbox.sc.edu
University of South Carolina,
Columbia, SC 29208
e-mail: sanghee@mailbox.sc.edu
Yiguang Ju
Department of Mechanical and
Aerospace Engineering,
Princeton University,
Princeton, NJ 08540
e-mail: yju@princeton.edu
Aerospace Engineering,
Princeton University,
Princeton, NJ 08540
e-mail: yju@princeton.edu
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 26, 2017; final manuscript received February 1, 2018; published online November 29, 2018. Assoc. Editor: Riccardo Da Soghe.
J. Eng. Gas Turbines Power. Jan 2019, 141(1): 011503 (12 pages)
Published Online: November 29, 2018
Article history
Received:
July 26, 2017
Revised:
February 1, 2018
Citation
Reuter, C. B., Won, S. H., and Ju, Y. (November 29, 2018). "Effects of CO2 Addition on the Turbulent Flame Front Dynamics and Propagation Speeds of Methane/Air Mixtures." ASME. J. Eng. Gas Turbines Power. January 2019; 141(1): 011503. https://doi.org/10.1115/1.4040518
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