An experimental study of turbulent diffusion flames established on a porous plate behind a backward-facing step

A study on diffusion flame established on a porous plate behind a backward-facing step disturbed in a parallel air stream was performed experimentally using an apparatus shown in a figure. As a turbulence generator, a turbulent grid or a cylinder was located upstream of the step. Methane was used as fuel and injected uniformly through a porous plate burner. Visualization of flame was performed by both direct and color schlieren photography. Thermal structures of the flame were measured using thin thermocouple and the data obtained were compensated digitally for thermal response.