Investigation of the Combustion Behaviour of Solid Fuel Slabs in a Planar Step Combustor with a Colour Schlieren Technique

Kurzfassung

The combustion behaviour of solid fuel slabs with and without boron particle addition has been investigated with a Colour Schlieren technique in a planar step combustor under ramjet relevant conditions concerning the air inlet temperature. Large scale vortical structures are conspicuous in the outer zone above the diffusion flame in the developing boundary layer behind the recirculation zone. On Colour Schlieren pictures with longer exposure times the superimposed thermal emission from the flame region gives additional information on the location of the flame front.