Numerical and experimental study of catalytic activity of super high-temperature ceramics

Using the calculation and experimental methods, the catalytic activity of samples from super high-temperature ceramics based on hafnium diboride was determined at TsAGI VAT-104 hypersonic wind tunnel equipped with a high-frequency induction gas heater was used to study the overflow and heating of ceramic disks at surface temperatures up to 3500 K. A significant effect of the catalytic properties of materials at ultrahigh flow rates on the heat flow was demonstrated. At the same time, for the conditions of experiments at the VAT-104 facility, in the framework of the Navier ‒ Stokes equations, a numerical simulation of the flow of chemically nonequilibrium air plasma over these models was carried out. By comparing of the calculated and experimental values of the heat fluxes to the surface of the disk, the catalytic activity of the ceramic material is determined.