Analysis of Mixing Enhancement Using Streamwise Vortices in a Supersonic Combustor by Application of Laser Diagnostics

Kurzfassung

In this paper, we will present first overview of our experimental investigation on the mixing processes by the supersonic streamwise vortices using Mie scattering. Main purposes of this study are to clarify how the fuel/air mixing processes are affected by the initial streamwise vortex arrangements in terms of vortex circulations and co- or counter-rotation and combustion heat release. Experiments are conducted Mach 2.48 direct-connect supersonic combustor. Four kinds of Alternating-Wedge fuel injector struts are examined. Results show that initial arrangement of streamwise vortices significantly affect the mixing processes, such as the rotational motion of the streamwise vortices due to their mutual interactions through their induced velocity field and following streamwise vortex (fuel jet) structuraes, growth rate of mixing region, evolution of turbulent motions within the hydrogen jet (large-scale streamwise vortices). It is also revaeled that structures of fuel jet (streamwise vortices) are strongly affected by combustion heat release to obtain more uniform fuel distribution.