Abstract
Extinction characteristics of counterflow radiating non-premixed CH 4/CO2 versus O2/CO2 flames at elevated pressures up to 0.7 MPa were studied both experimentally and computationally. Conventional C-shape extinction curves due to the upstream conduction loss at lower stretch rate were observed at 0.1 and 0.2 MPa. However, at 0.5 and 0.7 MPa, fuel-lean extinction limits were monotonously broadened with the decrease of stretch rate at lower stretch rate region while CH 4/N2 versus O2/N2 flames showed conventional C-shaped extinction behavior at the same condition. Interpretation of these experimental extinction characteristics was made with one-dimensional computations using optically thin and statistical narrow-band radiation models. The computational results implies the observed phenomena can be attributed to the radiation reabsorption which plays a significant role at high pressure conditions.
Original language | English |
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Pages (from-to) | 1223-1230 |
Number of pages | 8 |
Journal | Proceedings of the Combustion Institute |
Volume | 31 I |
Issue number | 1 |
DOIs | |
Publication status | Published - 2007 |
Event | 31st International Symposium on Combustion - Heidelberg, Germany Duration: 2006 Aug 5 → 2006 Aug 11 |
Keywords
- Counterflow non-premixed flames
- Extinction
- Oxygen combustion
- Radiative extinction
- Statistical narrow-band model
ASJC Scopus subject areas
- Chemical Engineering(all)
- Mechanical Engineering
- Physical and Theoretical Chemistry