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Research Papers: Fuel Combustion

High Pressure Shock Tube Ignition Delay Time Measurements During Oxy-Methane Combustion With High Levels of CO2 Dilution

[+] Author and Article Information
Owen Pryor, Samuel Barak, Joseph Lopez, Erik Ninnemann, Batikan Koroglu, Leigh Nash

Department of Mechanical and
Aerospace Engineering,
Center for Advanced Turbomachinery and
Energy Research (CATER),
University of Central Florida,
Orlando, FL 32816

Subith Vasu

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

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 1, 2017; final manuscript received March 1, 2017; published online March 30, 2017. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 139(4), 042208 (Mar 30, 2017) (6 pages) Paper No: JERT-17-1105; doi: 10.1115/1.4036254 History: Received March 01, 2017; Revised March 01, 2017

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% to 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 account the different parameters showing 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 the development of future kinetic mechanisms.

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Figures

Grahic Jump Location
Fig. 1

Comparison between N2 and CO2 dilution at different pressures. Simulations were performed with the aramco 1.3 mechanism [8].

Grahic Jump Location
Fig. 2

Emission and pressure trace at 1515 K near 30 atm in 5%CH4/10%O2/85%CO2 mixture. Time-zero was defined based on the Schlieren peak that occurs due to beam steering. The ignition delay time was defined as the time between time-zero and the peak of the emissions trace.

Grahic Jump Location
Fig. 3

Emissions trace and methane time-history of experiment (conditions same as in Fig. 2). Beam steering can be seen at time-zero of the laser due to the density change of the fluid as the shockwave passes.

Grahic Jump Location
Fig. 4

Measured and simulated ignition delay times: (a) ignition delay times around 1 atm [22] and (b) ignition delay times around 8 atm. Red and blue lines represent aramco 1.3 and gri 3.0 mechanisms, respectively. (See figure online for color)

Grahic Jump Location
Fig. 5

Ignition delay times for p ∼ 30 atm compared to aramco 1.3 (red) and gri 3.0 (blue) mechanisms [6,7] (See figure online for color)

Grahic Jump Location
Fig. 6

Ignition delay time correlation compared to the measured ignition delay times

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