Combined Measurements and Computations of High Enthalpy and Plasma Flows for Determination of TPM Surface Catalycity
TITLE: Measurement Techniques for High Enthalpy and Plasma Flows [Techniques de mesure pour les ecoulements de plasma et les ecoulements a haute enthalpie] To order the complete compilation report, use: ADA390586 The component part is provided here to allow users access to individually authored sections f proceedings, annals, symposia, ect. However, the component should be considered within he context of the overall compilation report and not as a stand-alone technical report. The paper presents the method for the TPM catalycity 3,5m/s V prediction on the basis of high enthalpy plasmatron heat 102rn/c transfer tests, performed in subsonic regimes, and 1400 appropriate CFD modeling of the whole plasma flow field in the plasma wind tunnel (1), viscous reacting gas ,5 flows around a test model (2), a nonequilibrium 12=1,0m0s boundary layer near the stagnation point of a test model 1200 (3) and analysis of the the heat transfer for test conditions l • 0m/s at the small Reynolds and Mach numbers (4). In general, the methodology was developed during the study of the 1000 catalytic efficiencies of the Buran TPM-the black 0 1 2 3 X, m ceramic tile and the CC material with antioxidation coating-in dissociated nitrogen and air reacting flows. Fig. 1. Surface temperature distribution along the windward This experimental-theoretical methodology has been center line of the Bor vehicle [ref 8]. Dots-the flight test modified recently for the determination of TPM data: I-CC material with antioxidation coating; 2-ceramic catalycity in subsonic carbon dioxide and pure oxygen tile, 3-ceramic tile covered with black platinum. Curves-flows from high enthalpy tests performed by using the computations at different catalytic recombination rates Kw. 100-kW inductive IPG-4 plasmatron. The interaction between combined ground test measurements and CFD modeling is considered as genesis for catalytic effects Tw, K duplication, plasma flow field rebuilding and the extraction of the quantitative catalycity parameters from the measured high enthalpy flow parameters, surface temperature and stagnation point heat fluxes.
Utilization of infrared thermography to investigate atmospheric entry aerothermodynamics of space vehicles at von Karman Institute
Arial, 9pt, bold) Space vehicles that are making an entry through the atmosphere of a planet suffer tremendously because of extreme heating of the vehicle. The design of thermal protection systems for space vehicles involves multidisciplinary topics and is a very critical stage of space vehicles. The qualification of thermal protection systems on ground is very important for a safe space flight and the protection of critical payloads. At von Karman Institute, several ground facilities are used for the characterisation and qualification of thermal protection systems and materials. Infrared thermography is one of the most important measurement techniques used to monitor surface temperature and heat flux imposed on the thermal protection material, thus enabling the researchers to analyse the structural and thermal behaviour of tested materials. This should not be more than 100 words (Arial, 9 pt, justified).
Nitrogen recombination on high-temperature reusable surface insulation and the analysis of its effect on surface catalysis
The energy transfer catalytic recombination coefficients for nitrogen and oxygen on a borosilicate glass are determined in nitrogen and air hypersonic arc jet streams. These data, obtained from a reacting boundary-layer analysis with first-order surface reaction kinetics, compare well with earlier results from a Goulard frozen boundary-layer model up to 1600 K. The apparent surface recombination rates increase up to 1600 K, then begin to decrease. To illustrate the effects of temperature and nitrogen dissociation on energy transfer to the glass, a diffusional heat-flux is calculated using the present results from 1450 K up to 1850 K. This diffusional heat-flux is the contribution to the total heating rate by atom recombination, and is used to compare the present results with coefficients from three previous studies.