Determination of the Effective Probabilities of Catalytic Reactions on the Surfaces of Heat Shield Materials in Dissociated Carbon Dioxide Flows

Effect of Physical Adsorption on Heat Fluxes to Catalytic Surfaces in Carbon Dioxide

“…Table.1. For reaction 1-3 parameters i A and i E were determined in [24] ground a comparison of the calculated heat fluxes in dissociated carbon dioxide with those measured on VGU-4 plasma generator of the Institute for Problems mechanics of RAS [21,28]. Catalytic model parameters for reactions 4-6 were determined from analysis data [27] and from comparison calculated and measured heat fluxes in the third regime of subsonic flow past the model at low temperature (Table 2).…”

“…In this study, the heat fluxes were calculated the same way as [21], that is described in details in [29,30], within the framework of the finite-thickness boundary layer problem using the gaseous medium model. In this approach, the gas composition at the outer edge of the boundary layer is assumed to be equilibrium.…”

“…The first results of measurements of the dissociated carbon dioxide flow parameters, as well as the heat fluxes to a catalytic surface and the temperature of the latter, were published in [21,22] for three coating materials types and quartz. The approach developed in [5,19,20] was used to model the catalytic properties of heat-shield coatings in a dissociated CO 2 -N 2 mixture in [23,24].…”

“…The approach developed in [5,19,20] was used to model the catalytic properties of heat-shield coatings in a dissociated CO 2 -N 2 mixture in [23,24]. On the basis of the experimental data interpretation, explicit relationships between the catalytic activities and the near-surface conditions (temperature, pressure, and concentrations) were derived for the coatings studied in [21,25]. For each of these coatings, the heat fluxes at the Mars Miniprobe stagnation point were calculated along the vehicle's entry trajectory into the Martian atmosphere and the coatings usability in the thermal protection system of the vehicle was established.…”

Operation Characteristics of Laser Driven Plasma Wind Tunnel

“…Arc-heaters are widely used to generate such high enthalpy flows because of their long operational time, simple structure and ease of maintenance. [1][2][3][4] However, surface catalytic effects and active and passive oxidation of TPS materials have been recognized as important issues [5][6][7][8] ; erosion of their electrodes poses an important obstacle because polluted flows make it difficult to evaluate chemical reaction rates in front of TPS surfaces.…”