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HIGH PRESURE SHOCK TUBE IGNITION DELAY TIME MEASUREMENTS DURING OXY-METHANE COMBUSTION WITH HIGH LEVELS OF CO2 DILUTION

[+] Author and Article Information
Owen Pryor

Center for Advanced Turbomachinery and Energy Research (CATER) Department of Mechanical and Aerospace Engineering University of Central Florida Orlando, Florida 32816, USA
ompryor@knights.ucf.edu

Samuel Barak

Center for Advanced Turbomachinery and Energy Research (CATER) Department of Mechanical and Aerospace Engineering University of Central Florida Orlando, Florida 32816, USA
sambarak@knights.ucf.edu

Joseph Lopez

Center for Advanced Turbomachinery and Energy Research (CATER) Department of Mechanical and Aerospace Engineering University of Central Florida Orlando, Florida 32816, USA
jlopez12@knights.ucf.edu

Erik Ninnemann

Center for Advanced Turbomachinery and Energy Research (CATER) Department of Mechanical and Aerospace Engineering University of Central Florida Orlando, Florida 32816, USA
erik.ninnemann@Knights.ucf.edu

Batikan Koroglu

Center for Advanced Turbomachinery and Energy Research (CATER) Department of Mechanical and Aerospace Engineering University of Central Florida Orlando, Florida 32816, USA
koroglu1@llnl.gov

Leigh Nash

Center for Advanced Turbomachinery and Energy Research (CATER) Department of Mechanical and Aerospace Engineering University of Central Florida Orlando, Florida 32816, USA
leighn2010@knights.ucf.edu

Subith Vasu

Center for Advanced Turbomachinery and Energy Research (CATER) Department of Mechanical and Aerospace Engineering University of Central Florida Orlando, Florida 32816, USA
subith@ucf.edu

1Corresponding author.

ASME doi:10.1115/1.4036254 History: Received March 01, 2017; Revised March 01, 2017

Abstract

Ignition delay times and methane species time-histories were measured for methane/O2 mixtures in a high CO2 diluted environment using shock tube and laser absorption spectroscopy. The experiments were performed between 1300 K and 2000 K at pressures between 6 and 31 atm. The test mixtures were at an equivalence ratio of 1 with CH4 mole fractions ranging from 3.5% -5% and up to 85% CO2 with a bath of argon gas as necessary. The ignition delay times and methane time histories were measured using pressure, emission, and laser diagnostics. Predictive ability of two literature kinetic mechanisms (GRI 3.0 and ARAMCO Mech 1.3) was tested against current data. In general, both mechanisms performed reasonably well against measured ignition delay time data. The methane time-histories showed good agreement with the mechanisms for most of the conditions measured. A correlation for ignition delay time was created taking into the different parameters showing that the ignition activation energy for the fuel to be 49.64 kcal/mol. Through a sensitivity analysis, CO2 is shown to slow the overall reaction rate and increase the ignition delay time. To the best of our knowledge, we present the first shock tube data during ignition of methane/CO2/O2 under these conditions. Current data provides crucial validation data needed for development of future kinetic mechanisms.

Copyright (c) 2017 by ASME
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