engleski

Application of Reduced Mechanisms for Nitrogen Chemistry in Numerical Simulation of a Turbulent Non-Premixed Flame

In this paper, the formation of nitrogen pollutants in computational fluid dynamics (CFD) simulation of turbulent non-premixed flame was modelled by coupling a reduced NO chemical reaction mechanisms with comprehensive combustion model in commercial CFD code FIRETM. The reduced nitrogen scheme is based on thermal NO formed by oxidation of atmospheric nitrogen and prompt NO formed by reactions of atmospheric nitrogen with hydrocarbons radicals in fuel-rich regions of the flame. The effects of the turbulent fluctuations on the NO reaction rates were accounted for by integrating the kinetic rates with respect to fluctuating temperatures over presumed probability density function (PDF). For combustion prediction a steady laminar flamelet model (SLFM) was employed. The NO formation was decoupled from the comprehensive combustion model and considered in post-processor routine using converged solution of a pre-calculated flame structure. The NO predictions are compared with experimental data.

FIRETM; NOx; Sandia flameD

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