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Uncertainty assessment on the characterization of testing conditions in arc-jet facilities

par Del Val Benítez, Ana Isabel;Magin, Thierry ;Chazot, Olivier
Référence 33rd AIAA Aerodynamic Measurement Technology and Ground Testing Conference(33: 2017-06-05: Denver), American Institute of Aeronautics and Astronautics Inc
Publication Publié, 2017

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Résumé :

The characterization of the free stream conditions in high enthalpy facilities is strongly influenced by the accuracy of experimental measurements and physico-chemical models used in the rebuilding procedure. A free stream conditions rebuilding code (CABARET) is developed and applied to arc-jet facilities under different experimental conditions. The rebuilding code is based on the conservation of total enthalpy and entropy in the expansion through the nozzle together with the Rankine-Hugoniot equations for normal shock waves. The total quantities are then computed to obtain the heat ux to the surface of our experimental model by means of the Fay-Riddell equation. A Newton-Raphson numerical method is employed to invert the problem and compute the free stream conditions from a set of three different measurements. A sensitivity analysis is compared to an uncertainty quantification study based on a Monte-Carlo method for two different experimental conditions. The comparative results show a good agreement in terms of the coefficient of variation (relative error). The uncertainty quantification study provides more information on the nature of the problem regarding confidence intervals, correlations between parameters and linearity of the system.