Transport Algorithms for Premixed, Laminar Steady State Flames

摘要

The effects of different methods of approximating multispecies transport phenomena in models of premixed, laminar, steady-state flames have been studied. Five approximation methods that span a wide range of computational complexity are developed. Identical data for individual species properties have been used for each method. Each approximation method is employed in the numerical solution of a set of five H2-O2-N2 flames. For each flame the computed species and temperature profiles, as well as the computed flame speeds are found to be very nearly independent of the approximation method used. This does not indicate that transport phenomena are unimportant, but rather that the selection of the input values for the individual species transport properties is more important than the selection of the method used to approximate the multispecies transport. Based on these results we have developed a sixth approximation method that is computationally efficient and which provides results extremely close to the most sophisticated and precise methods used.