Enhancement of Chamber Wall Heat Transfer by Surface Contouring

摘要

The effect of surface features on chamber wall heat transfer has been measured in a sub-scale combustion chamber. Results are reported for five different roughness patterns for conditions of hydrogen/oxygen combustion at mixture ratios of 2-6 and chamber pressures of 100-200 psig. The results include the measured levels of heat flux and Stanton number. The transverse ribs and grooves had the largest effect, resulting in approximately a doubling of the heat flux relative to a smooth plate, and the increase in Stanton number agreed well with a correlation based on skin-friction.