ON AMMONIA KINETICS OF OXIDATION UNDER HIGHLY TURBULENT CONDITIONS AND IMPACT OF NITRIC OXIDE
Résumé
Experiments performed in a JSR under turbulent conditions at 1 bar for several equivalence ratios (0.1 to 2), initial mole fractions of ammonia (500 to 1000 ppm) and NO (0 to 1000 ppm) revealed significant acceleration of ammonia ignition and oxidation by nitric oxide and conversion of NO to NO2.
A previously proposed kinetic model was updated to improve the modelling of ammonia-air flame speeds. It could be used to well predict the JSR data, ammonia ignition, and ammonia-air flame speeds. According to computation using that updated model, the mutual sensitization of the oxidation of NH3 and NO is due to a sequence of reactions producing (i) OH and (ii) HO2 radicals, principally involved in the oxidation of ammonia: (i) NH2 + NO → NNH + OH, NNH → N2 + H, H + O2 → OH + O, and (ii) NNH + O2 → N2 + HO2 and H + O2 + M → HO2 + M, NO + HO2 → NO2 + OH.
Origine | Fichiers produits par l'(les) auteur(s) |
---|---|
Licence |
Domaine public
|