Evaluation of Supersonic Turbulent Mixing Using Catalytic Combustion of Constant Temperature Pt Wire

Abstract

Supersonic combustion using catalytic wire at constant temprature in a cold supersonic flow field was investigated in a square duct with a backward-facing step. The free stream Mach number was M_m=1.18. Hydrogen was injected transversely behind a backward-facing step into a cold air free-stream. The heat released from the catalytic combustion had no effect on the temperature of the catalyst. This indicates that the reaction rate of the catalytic combustion observed in this study was determined by the concentration of H₂ and / or O₂ on the surface of the catalyst. The spatial distribution of heat released from the catalytic combustion in supersonic turbulent mixing layer, corresponds to the spatial distribution of concentration of H₂ and / or O₂ in local, was obtained. It was found that the most suitable position for supersonic combustion was at the outer edge of the mixing layer.