Shock tube study of ignition delay times in methane--oxygen--nitrogen--argon mixtures. [N/sub 2/ effects on ignition delay of CH/sub 4/--O/sub 2/ mixtures]
Journal Article
·
· Combust. Flame; (United States)
Ignition delay times have been measured in homogeneous CH/sub 4/-O/sub 2/ and CH/sub 4/-O/sub 2/-N/sub 2/ mixtures dilute in argon, in order to investigate the influence of molecular nitrogen. The mixtures were heated behind reflected waves in a conventional shock tube to temperatures between 1640 and 2150/sup 0/K at pressures from 1 to 6 atm. Equivalence ratios of 1.0 and 2.0 were investigated and the methane concentration ranged from 1 x 10/sup -7/ to 9 x 10/sup -7/ mole/cc. Ignition was identified from photometric observations of OH (3064 A), H/sub 2/O (2.7 ..mu..) and CO/sub 2/(4.3 ..mu..) emission. For both the CH/sub 4/-O/sub 2/ and CH/sub 4/-O/sub 2/-N/sub 2/ mixtures, the measured ignition delays (tau/sub i/) were correlated by the empirical expression tau/sub i/ = 4.4 x 10/sup -15/ exp (52,300/RT)(CH/sub 4/)/sup 0/./sup 33/(O/sub 2/)/sup -1/./sup 03/, in mole, cal, cm and sec units. It was concluded that molecular nitrogen has little or no influence upon the ignition delay times of methane-oxygen mixtures. This conclusion is supported by several earlier investigations of methane ignition but conflicts with the recent study by Zallen and Wittig.
- Research Organization:
- Grumman Aerospace Corp., Bethpage, NY
- OSTI ID:
- 7227434
- Journal Information:
- Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 27:3; ISSN CBFMA
- Country of Publication:
- United States
- Language:
- English
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