Effusion Cooling of Throat Region in Rocket Engines Applying Fibre Reinforced Ceramics

This report summarizes the experimental work in the field of effusion cooling done with C/C (carbon fibres in carbon matrix) for a porous cylinder in combination with a porous nozle. The experiments presented here have been realized using gaseous hydrogen at ambient temperature as coolant. These recent DLR experiments have been performed for combustion chamber pressures ranging between o.8 MPa and 1.2 MPa at a constant oxidizer/fuel mixture ratio 6.5. For this basic experiments there is a micro combustor at DLR. The porosity for the cylinder and nozzle was e = 26%. The coolant mass flow for the porous cylinder and nozzle has been varied in a wide range to get informations about the influence of the cooling film from the cylinder to the nozzle