The experimental study of surface catalytic effect on the stagnation heat-transfer rates in high-enthalpy shock tube

摘要

With the development of hypersonic vehicles, the surface catalytic effect play a more and more significant role on the aerodynamic heat loads of the vehicles under high enthalpy disassociated environment. In this paper, an experimental campaign dedicated to the catalytic effect on aerodynamic heating is performed in high-enthalpy shock tube. The heat-transfer rates at the stagnation region of test models are measured using coaxial thermocouples. The surface of the test model was coated with Cu or Al_2O_3 film, and the Cu coated model showed a heat-transfer-rate value 28% higher than that to a Al_2O_3 coated model in air environment. The chemical non-equilibrium effect has significant influence on the non-catalytic heat flux of sharp leading edge. The obtained results would be useful for the accurate prediction of the aerodynamic heat load for hypersonic vehicles.