Transport Algorithms for Methane Flames

Abstract

Abstract–: The effects of three different methods of approximating multispecies transport phenomena in models of premixed, laminar, steady-state Ilames have been studied. The most precise, the most simple and a compromise transport algorlthm were used to model methane-oxygen flames at one atmosphere with diluents of nitrogen, argon or helium. The thermodynamic and Lennnrd-Jones (Stockmayer) coefficients for individual species were held fixed together with the kinetic network and rate coefficients. Only the computational algorithms were changed. Within factors of 10-20 percent we found that the computed flame speeds and species and temperature profiles were independent of the algorithm employed. Since we had previously reported a similar independence for hydrogen-oxygen-nitrogen flames we infer that this result is a general one.