Modeling of Steady High-Pressure Laminar Premixed Flames of n-Heptane and Iso-Octane

Abstract

A model is proposed for quasi-one-dimensional steady flame development in the configuration of an inviscid, premixed fuel jet injected into air. The governing equations are written within the framework of a reduced kinetic model based on constituents and species. The reduced kinetic model, previously exercised in a constant-pressure perfectlystirred reactor mode, has been successful at predicting ignition and combustion product and temperature evolution for n-heptane, iso-octane, PRF fuel combinations, and mixtures of iso-octane with either n-pentane or iso-hexane. The differential governing equations are coupled with a real gas equation of state. The flame development model accounts for a full diffusion matrix, and thermal conductivity computed for the species mixture. Results are presented for both n-heptane and iso-octane at stoichiometric conditions over the pressure range of 1 - 40 bar. Additionally, an equivalence ratio study is conducted for iso-octane at a pressure of 40 bar.

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