Lagrangian-Eulerian Calculation of Turbulence Effects on Premixed Flame Propagation

摘要

This paper explores the interaction between time dependent turbulent flow structure and an irreversible one-step decomposition reaction. This reaction is a special case of A + B goes to products; i.e., when the concentration of A is much smaller than that of B. The time dependent flow structure is calculated by the discrete vortex dynamics method. The flow field is two-dimensional and is confined to a unit square through the use of periodic boundary conditions. The velocity field from the known vortex locations is used to describe the convection of temperature and a single species on a fixed Eulerian mesh. For this study, unit-Lewis-number, temperature-independent transport coefficients, and constant density have been assumed. The calculated turbulent flame speed agrees with the wrinkled laminar flame model and experimental correlations in that at constant turbulent length scale the flame speed depends linearly on turbulent intensity. (ERA citation 06:020665)