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High pressure shock tube ignition delay time measurements during oxy-methane combustion with high levels of CO2 dilution

Journal Article · · Journal of Energy Resources Technology
DOI:https://doi.org/10.1115/1.4036254· OSTI ID:1347214
 [1];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of Central Florida, Orlando, FL (United States); university of central florida
  2. Univ. of Central Florida, Orlando, FL (United States)
For this study, 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. In conclusion, current data provides crucial validation data needed for development of future kinetic mechanisms.
Research Organization:
Univ. of Central Florida, Orlando, FL (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0025260
OSTI ID:
1347214
Alternate ID(s):
OSTI ID: 1353406
Journal Information:
Journal of Energy Resources Technology, Journal Name: Journal of Energy Resources Technology Journal Issue: 4 Vol. 139; ISSN 0195-0738
Publisher:
ASMECopyright Statement
Country of Publication:
United States
Language:
English

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