Nitric Oxide Formation in Strained Laminar Hydrogen-Air Counter Flow Diffusion Flames


This paper discusses the numerical simulation of the equations governing the stagnation point counter flow diffusion flame formulated under the boundary layer assumptions using a similarity transformation. The model uses detailed chemistry, multiconponent diffusion and thermal diffusion of light species. The relative importance of the thermal NO mechanism and the N2O pathway is discussed. The importance of the various chemical kinetic steps is assessed with the help of rate of progress variables computed in the numerical simulation. The heated-air-stream cases (1100 K) were used to simulate conditions similar to those in real engine operation. A nonequilibrium region and an equilibrium region are observed in the flame, the Telative size of the former increasing with increasing strain rate. As the strain rate increases, NO formation shift from the Zeldovich mechanism to the N2O pathway, which confirms the findings of other workers.


Mechanical and Aerospace Engineering

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Article - Conference proceedings

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Publication Date

01 Jan 1995