Numerical Study on a Planar Diffusion Flame Stabilized behind a Backward-facing Step

Abstract

A numerical study on a planar diffusion flame stabilized behind a backward-facing step is performed. Computational model is set to simulate our experimental study where a fuel gas is supplied from a porous plate behind the backward-facing step. A flame sheet model is used because the simulation is focused on the stabilized flame. The computational scheme is the SIMPLE with the QUICK for convection terms. Although the model is restricted to two-dimensional, the results show that the flame deforms due to the Kelvin-Helmholtz instability arising from the density change due to combustion. Comparison with the experiment is succesfully performed by the schlieren photography and the temperature variation.