Abstract
The formation of NO in overdriven H 2air and C 2H 4air detonations was experimentally and numerically investigated under various temperature and pressure conditions. The NO concentrations were measured by (0,1)NO-γ resonance absorption with additional OH and CO + O emission measurements. It was found that the NO formation rates near the detonation front are greater by a factor of 1≤ψ≤4 than predicted by the Zeldovich three-reaction mechanism assuming equilibrium O and OH concentrations. By computer simulation of a one-dimensional detonation wave together with hydrogen oxidation and NO formation kinetics, a nearly complete fit of the NO profiles measured under different conditions was possible. In the same way the simulation of C 2H 4air detonative combustion was successful using a scheme of 52 elementary reactions to describe the C 2H 4 oxidation and of 9 reactions for NO formation. It was possible to fit all measured NO profiles by use of an adjusted rate coefficient for the reaction CH + N 2, which is part of the NO formation scheme.
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