RESEARCH ON THE EFFECTS OF COLLISIONS OF SMALL PARTICLES WITH BODIES MOVING AT HYPERSONIC SPEED PARTⅢ EROSION AND HEAT TRANSFER EFFECTS

摘要

The effects of distributed surface roughness on convective heat transfer were studied experimentally in a blow-down flow channel capable of simulating the aero¬dynamic characteristics of hypersonic flight. Smooth and roughened copper heat transfer models were utilized. Specially developed heat flux meters, installed in the models gave local heat transfer coefficients. Maximum values for roughened models were 263 per cent higher than for smooth models.nThe effects of surface damage on the ablation process were studied in the blow-down channel, utilizing naphthalene models. The surfaces of these models were either (1) initially smooth, (2) grooved or pitted, or (3) embedded with foreign objects.