NO2Formation in the Mixing Region of Hot Burned Gas with Cool Air—Effect of Surrounding Air

Abstract

Conservation equations are numerically solved for the hot burned gas of methane-air with surrounding air with or without unburned methane to investigate the influence of the presence of unburned hydrocarbon in the surrounding air and of the surrounding gas temperature on the formation of N02 in the mixing region of hot burned gases with surrounding cool air. The spatial distributions of temperature and species concentrations in the gas mixture were predicted in laminar flow field at atmospheric pressure. In the mixing region, the presence of unburned methane in the surrounding air is found to promote the conversion of NO to N0₂ and its conversion ratio N0₂/NO_x increases with increa se in the amount of unburned methane. The N0₂ formation in the mixing region is suppressed with increase in the temperature of surrounding air with or without unburned methane.