Methods and Results of an Experimental Determination of the Catalytic Activity of Materials at High Temperatures

Experimental and Theoretical Simulation of Heterogeneous Catalysis in Aerothermochemistry (a Review)

“…3 we have reproduced the values of k w for the "Buran" heat shield tile coating obtained in [4,11,16,18,19,59,60]. In [16,19] the value k wO = k wN = k w = 1.2 m/s was recommended, while the approximation k w = 553 exp(−8232/T w ) m/s was given in [60].…”

“…The catalytic properties of the boron-silicate tile coating and oxidation-resistant carboncarbon material used in the "Buran" heat shield system [11,[16][17][18] have been determined in subsonic and supersonic nitrogen and air flows and multi-cycle tile testing for thermochemical resistance has been carried out [19].…”

“…Plasma generator flow diagnostics are based both on contact measurements of the static pressure, stagnation pressure, enthalpy, and heat fluxes to high-and low-catalyticity materials [18][19][20][21][27][28][29][30] and on spectral temperature measurements [31]. So far, the measurements of the atom concentrations c Ae at the outer edge of the boundary layer needed to reconstruct γ have presented a difficult problem.…”

“…In order to calculate the equilibrium concentrations c Ae it is necessary to know the stagnation pressure and the heat flux to a standard high-catalyticity surface. In a chemically nonequilibrium flow, when the oxygen molecules are completely dissociated, it is also necessary to measure the heat fluxes to a standard low-catalyticity surface in order to determine c Ne [18].…”

“…In the subsonic regime of dissociated air flow past models numerical solutions of the one-dimensional nonequilibrium boundary layer equations at the stagnation point have been used [18]. The two-dimensional Navier-Stokes equations for nonequilibrium five-component air were solved by the implicit finite-element method [49] in a nozzle and along a flat plate and a wavy surface [35,50].…”