Computational studies on one-dimensional laminar, premixed hydrogen-nitric oxide flames

Abstract

Results of computational studies of adiabatic flame propagation in the hyperogen-nitric oxide system are presented here. The sensitivity of flame speed to the rate constants of various reactions is examined. Reactions of the extended Zeldovich mechanism H + NO = N + OH and N + NO = O + N₂ are the major NO removal reactions at high temperatures. Studies show that the flame speed is extremely sensitive to the rate constant of the reaction H + NO = N + OH. The reactions involving HNO are found to be important in H₂---NO kinetics, the most sensitive reaction being the HNO decomposition reaction. Reactions involving N₂O make insignificant change in flame speed (less than 0.5%) at all conditions and can be deleted from the reaction set. A mechanism involving ten species (O₂, O, H₂, H, OH, H₂O, N₂, N, NO, HNO) and ten reversible reactions established here predicts flame speeds of H₂---NO system at various conditions of equivalence ratio, initial temperature, and pressure. Results are in good agreement with the experimental results of Magnus, Chintapalli, and Vanpee.