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1. IMPURITIES DURING ICRF HEATING EXPERIMENT IN JFT-2

Author

Paper presented by and K. Odajima

Subjects
Materials science, Impurity, Condensed Matter::Superconductivity, Nuclear engineering, Condensed Matter::Strongly Correlated Electrons, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Heating efficiency
Abstract

Impurities during the ICRF heating experiment in JFT-2 are presented. One atempt to reduce impurities and to improve a heating efficiency is shown.

Published
1982

2. Ablative thermal protection system under uncertainties including pyrolysis gas composition

Author

Jean Lachaud, Mickael Rivier, Pietro Marco Congedo, Shape reconstruction and identification (DeFI ), Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Mathématiques Appliquées - Ecole Polytechnique (CMAP), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université de la Nouvelle-Calédonie (UNC), Experiments presented in this paper were carried out using the PlaFRIM experimental testbed, supported by Inria, CNRS (LABRI and IMB), Université de Bordeaux, Bordeaux INP and Conseil Régional d'Aquitaine (see https://www.plafrim.fr/)., Centre de Mathématiques Appliquées - Ecole Polytechnique (CMAP), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-Inria Saclay - Ile de France, and Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)

Subjects
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], 0209 industrial biotechnology, Hypersonic speed, Nuclear engineering, Heat and mass transfer, Aerospace Engineering, 02 engineering and technology, 01 natural sciences, 010305 fluids & plasmas, 020901 industrial engineering & automation, Atmospheric entry, Space Shuttle thermal protection system, 0103 physical sciences, Environmental science, Anchored-ANOVA, Gas composition, Porous medium, Porosity, Material properties, Pyrolysis, Uncertainty quantification, Thermal protection systems, Pyrolysis Carbon/phenolic composites
Abstract

International audience; Spacecrafts such as Stardust (NASA, 2006) are protected by an ablative Thermal Protection System (TPS) for their hypersonic atmospheric entry. A new generation of TPS material, called Phenolic Impregnated Carbon Ablator (PICA), has been introduced with the Stardust mission. This new generation of low density carbon-phenolic composites is now widely used in the aerospace industry. Complex heat and mass transfer phenomena coupled to phenolic pyrolysis and pyrolysis gas chemistry occur in the material during atmospheric entry. Computer programs, as the Porous material Analysis Toolbox based on OpenFoam (PATO) released open source by NASA, allow to study the material response. In this study, a non-intrusive Anchored Analysis of Variance (Anchored-ANOVA) method has been interfaced with PATO to perform low-cost sensitivity analysis on this problem featuring a large number of uncertain parameters. Then, a Polynomial-Chaos method has been employed in order to compute the statistics of some quantities of interest for the atmospheric entry of the Stardust capsule, by taking into account uncertainties on effective material properties and pyrolysis gas composition. This first study including pyrolysis gas composition uncertainties shows their key contribution to the variability of the quantities of interest.

Published
2019