Trajectory analysis of radiative heating for planetary missions with aerobraking of spacecraft

Statistics – Computation

Scientific paper

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Aerobraking, Atmospheric Entry, Radiative Heat Transfer, Satellite Atmospheres, Spacecraft Trajectories, Trajectory Analysis, Computational Fluid Dynamics, Orbit Transfer Vehicles, Titan

Scientific paper

The aerodynamic drag generated during a grazing pass through a planetary atmosphere can be used to expend energy which a spacecraft has in excess of that required to achieve a closed orbit. The propulsion fuel mass saved by eliminating retropropulsive braking maneuvers makes possible missions which are otherwise impossible or impractical. The present investigation has the objective to examine the influence of atmospheric entry trajectory parameters on the magnitude of the radiative heating rates for both the Titan aerocapture and near-earth orbital transfer missions. Calculations are performed for a wide range of entry conditions encompassing those of many conceptual mission scenarios for both Titan and earth. It is found that the nonequilibrium radiative heating is enhanced over that for equilibrium and generally exceeds that for convection for most mission profiles. Nonequilibrium radiation heating is, therefore, an important factor in the design of the corresponding thermal protection systems.

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