Simulation of NO Formation in Hydrogen-air Counterflow Diffusion Flame

摘要

The combustion of hydrocarbon fuels produces large amounts of carbon dioxide. In order to cope with the challenge of greenhouse effect and global environmental protection. H_2, as a cleaner and more energy-burning fuel, is being considered in many of the practical applications of combustion equipments. However, H_2 fuel combustion will still produce pollutant NO_x. Thus, the study of NO_x emission is one of the most important topics in H_2 combustion. With the classical counterflow burner, a numerical simulation of NO emission was carried out on the H_2 diffusion flames. The stretch effects on flame temperature, NO concentration, and EINO are analyzed; the contribution of different NO generation routs are also quantified and analyzed. The major parameters influencing NO emission are flame temperature, radical concentration, and residence time, the observed relationship between stretch rate and NO emission is explained with the three major parameters.