Journal
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
Volume 142, Issue 10, Pages -Publisher
ASME
DOI: 10.1115/1.4047023
Keywords
shock tube; mild ignition; strong ignition; detonation; air emissions from fossil fuel combustion; alternative energy sources; energy conversion; systems; fuel combustion
Categories
Funding
- National Science Foundation [OISE 1460045]
- U.S. Department of Energy [DE-FE0025260, DE-EE0007982]
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Ignition delay times were measured for methane/O(2)mixtures in a high dilution environment of either CO(2)or N(2)using a shock tube facility. Experiments were performed between 1044 K and 1356 K at pressures near 16 +/- 2 atm. Test mixtures had an equivalence ratio of 1.0 with 16.67% CH4, 33.33% O-2, and 50% diluent. Ignition delay times were measured using OH* emission and pressure time-histories. Data were compared to the predictions of two literature kinetic mechanisms (ARAMCO MECH 2.0 and GRI Mech 3.0). Most experiments showed inhomogeneous (mild) ignition which was deduced from five time-of-arrival pressure transducers placed along the driven section of the shock tube. Further analysis included determination of blast wave velocities and locations away from the end wall of initial detonations. Blast velocities were 60-80% of CJ-Detonation calculations. A narrow high temperature region within the range was identified as showing homogenous (strong) ignition which showed generally good agreement with model predictions. Model comparisons with mild ignition cases should not be used to further refine kinetic mechanisms, though at these conditions, insight was gained into various ignition behavior. To the best of our knowledge, we present first shock tube data during ignition of high fuel loading CH4/O(2)mixtures diluted with CO(2)and N-2.
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