Investigation of the impact of the reactants temperature and equivalence ratio on the outlet mixture temperature, velocity and mole fraction for the combustion of the carbon monoxide and nitrous

Abstract

In the present study, a numerical code is used for three-dimensional simulation of non-premixed form of the combustion of nitrous-carbon monoxide mixture. This code includes standard K-ε as turbulent model and Probability Density Function (PDF) as thermo-chemistry approach. Ten species i.e. nitrous, carbon monoxide, carbon dioxide, nitrogen, nitrogen monoxide, atomic oxygen, oxygen, ozone, cyanate and atomic carbon are assumed contributing in this reaction. For the validation of model, experimental measurement of previous studies are applied. The influence of equivalence ratio and inlet gases temperature, on outlet mixture velocity, temperature and outlet species mole fraction are obtained in the form of charts for wide ranges, which was not clearly obtained in previous works. These charts are useful for designer of these systems. Results indicate, when Ø ≥ 0.15 N2O is decomposed completely and the maximum mole fractions for O2(approximately 0.27), N2 (approximately 0.77) and O3 (depending on the temperature) are obtained. Furthermore, it was found the mole fraction of the outlet carbon dioxide and dimensionless temperature of the outlet mixture are maximum at equivalence ratio equal to unity and if the temperature of the inlet gases is kept constant and the equivalence ratio reduces, the outlet carbon monoxide mole fraction decreases.