EFFECTS OF NON-ISOTHERMAL OXIDATION ON TRANSIENT CONJUGATE HEAT TRANSFER OF THE CRYO-SUPERSONIC AIR-QUENCHING

In this paper, the effects of non-isothermal oxidation on transient conjugate heat transfer of the cryo-supersonic air-quenching are investigated based on a double-layered oxidation kinetics model, while a unified conjugate heat transfer formula is developed to synthetically consider the near-wall turbulence, non-isothermal oxidation, and surface radiation. The comparison between numerical and experimental results are also presented to check the validity of the developed model. The results indicate that the film growth has some degree of inhibition to the conjugate heat transfer, in particular, the stagnation temperature increases linearly by about 5 K per 100 mu m increase in film thickness, and the effective conjugate heat transfer coefficient in the stagnation region decreases linearly by about 55 Wm-2K-1 per 100 mu m increase in film thickness. Moreover, the oxide film would have little impact on transient conjugate heat transfer when the nearwall velocity is higher due to the effect of viscous dissipation.