Experimental Study on Surface Catalytic Effect of Plate Model in Arc Wind Tunnel

At high Mach number conditions, the real high-temperature gas effect on the surface of hypersonic aircraft becomes very important. However, there is no exact test data for the influence of different catalytic properties on the aerodynamic heating of the ground thermal resistance assessment model under different arc wind tunnel conditions, which brings difficulties and uncertainties to the thermal design and assessment of the high Mach number aircraft. Therefore, it is necessary to carry out the experimental study on the catalytic effect of the surface under the wind tunnel. In this paper, the surface catalysis effect of flat test model is studied for large area of hypersonic vehicle. The influence of different wall catalysis on the catalytic effect of flat plate model under different enthalpy conditions is analyzed. The heat flux density is an important parameter in the simulation experiment of aerodynamic hot ground. Its numerical value directly reflects the influence of the catalytic effect on the aerodynamic heating. The chemical properties of different materials on the surface of the model determine the size of the catalytic effect. In this paper, two kinds of materials with different surface chemistries were selected as the measurement body of the heat flux. Different plug heat flux density calorimeters were used to measure the surface heat flux density of the plate model under different enthalpy conditions. The experimental results show that the peak heat flow between different catalytic walls is different by 10% when the total enthalpy is between 2000 kJ/kg and 11000 kJ/kg, and the peak heat flow between different catalytic walls is different by 30% when the total enthalpy is between 15000 kJ/kg and 20000 kJ/kg.