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.
Catalysis Phenomena Determination in Plasmatron Facility for Flight Experiment Design (Invited)
This article highlights the importance of ground plasma testing in the design and development of flight experiments for atmospheric reentry vehicles. The determination of catalytic properties covers a key role for Thermal Protection Systems, since flight catalysis phenomenon are often a design driver for the heat shield. The results of a test campaign at the von Karman Institute for Fluid Dynamics, in the framework of the European Space Agency EXPERT reentry mission, are presented. They are dedicated to the determination of the catalytic and emissive properties of the ceramic and metallic Thermal Protection Materials selected for the nose and the body-skirt of the EXPERT capsule respectively. During the reentry, the chemistry developing over the vehicle surface due to the different catalycity properties of the two Thermal Protection Materials can promote a temperature jump at their junction. An experimental evidence of such a phenomenon is also provided.
To Devolve or Not To Devolve? Welfare Reform in the States
This article analyzes variation in the degree to which states have responded to the devolution of welfare at the federal level by devolving authority over welfare policy to local government. I find that to the extent that states have devolved authority to lower levels of government, they tend to be states that already had a high degree of involvement of local government in welfare provision. In states without this record of local government involvement, the devolution that has occurred has not generated greater involvement of local government, but rather responsibility has been devolved to regional entities with ties to workforce development and with a substantial degree of business involvement. As states gain increasing authority over a redistributive policy, they may begin to treat it as a subset of a larger developmental policy—workforce development.