SHOCK TUBE STUDIES OF FUEL-AIR IGNITION CHARACTERISTICS
Abstract
Ignition induction times of hydrogen-air mixtures were measured after the reflected wave in a single-pulse shock tube as a function of mixture ratio, absolute pressure and temperature. The data have been correlated by a nonlinear regression program resulting in an equation for induction time as a function of these variables. The results support earlier work at this laboratory on argon- diluted hydrogen-oxygen experiments in that at temperatures below 1100 K the ignition delays became very long because of self-inhibition of the reaction through HO2 formation. The effects of added water vapor and nitric oxide on the ignition characteristics of hydrogen-air mixtures were studied. Both additives resulted in sensitization of the ignition reaction. A detailed investigation of the nitric oxide catalysis indicated that the maximum effect occurred at 0.5 mole percent of additive, where the ignition delay was decreased by a factor of 100 and the ignition temperature by 200 K. Nitrogen dioxide was found to be equally effective, but ammonia exhibited no sensitizing action. The ignition induction times of 0.5 and 1.0 equivalence ratio mixtures of methane-, butane-, and octane-air mixtures were determined from 0.2 to 10 milliseconds at a reflected shock pressure of 60 psia. The data are presented both in tabular and graphical form. All ignition delay data are discussed in light of related studies and potential kinetic mechanisms. Recommendations for future work are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1965
- Accession Number
- AD0470239
Entities
People
- A. D. Snyder
- D. L. Zanders
- G. B. Skinner
- J. Robertson
Organizations
- Monsanto