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Experimental and modeling study on effects of N2 and CO2 on ignition characteristics of methane/air mixture.
- Source :
-
Journal of Advanced Research . Mar2015, Vol. 6 Issue 2, p189-201. 13p. - Publication Year :
- 2015
-
Abstract
- The ignition delay times of methane/air mixture diluted by N 2 and CO 2 were experimentally measured in a chemical shock tube. The experiments were performed over the temperature range of 1300–2100 K, pressure range of 0.1–1.0 MPa, equivalence ratio range of 0.5–2.0 and for the dilution coefficients of 0%, 20% and 50%. The results suggest that a linear relationship exists between the reciprocal of temperature and the logarithm of the ignition delay times. Meanwhile, with ignition temperature and pressure increasing, the measured ignition delay times of methane/air mixture are decreasing. Furthermore, an increase in the dilution coefficient of N 2 or CO 2 results in increasing ignition delays and the inhibition effect of CO 2 on methane/air mixture ignition is stronger than that of N 2 . Simulated ignition delays of methane/air mixture using three kinetic models were compared to the experimental data. Results show that GRI_3.0 mechanism gives the best prediction on ignition delays of methane/air mixture and it was selected to identify the effects of N 2 and CO 2 on ignition delays and the key elementary reactions in the ignition chemistry of methane/air mixture. Comparisons of the calculated ignition delays with the experimental data of methane/air mixture diluted by N 2 and CO 2 show excellent agreement, and sensitivity coefficients of chain branching reactions which promote mixture ignition decrease with increasing dilution coefficient of N 2 or CO 2 . [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20901232
- Volume :
- 6
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Advanced Research
- Publication Type :
- Academic Journal
- Accession number :
- 101361944
- Full Text :
- https://doi.org/10.1016/j.jare.2014.01.003