Design and Calibration of a Flush Air Data System (FADS) for Prediction of the Atmospheric Properties During Re-Entry
Final rept. 1 Oct 2011-30 Sep 2012
VON KARMAN INST FOR FLUID DYNAMICS RHODE-SAINT-GENESE (BELGIUM)
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In this effort was developed a high temperature 1-D solver to reconstruct the Longshot wind tunnel conditions. It supports calorically imperfect, thermally perfect flows in thermal equilibrium or non-equilibrium. For non-equilibrium in the Longshot, the vibrational temperature has to be imposed. A prediction was obtained by solving Vibrational-Translational Energy Transfer and energy conservation equations for the Longshot nozzle geometry. Compared to the traditional rebuilding method, thermal nonequilibrium has a strong effect on the reconstructed density and Mach number of up to 6 and 4 respectively. Caloric imperfection had a more limited effect of up to 1 and 0,4 respectively. These results indicate that better understanding of thermal non-equilibrium due to the strong nozzle expansion is required to use the wind tunnel as a FADS calibration tool. Specifically, prior knowledge of the vibrational temperature is required. Caloric imperfections need to be taken into account to reconstruct the flow conditions as well, but this requires no prior knowledge.
- Unmanned Spacecraft