Numerical Study on Suppression of Reentry Capsule Dynamic Instability in Transonic Flow
AIAA SCITECH 2023 Forum（2023）
Tohoku Daigaku
Abstract
Detached eddy simulations with a fixed pitch angle and 1-Degree-Of-Freedom (1-DOF) were conducted for two reentry capsules with different shoulder geometries in order to elucidate the mechanism of the self-excited oscillation and find a suppression method. The capsule shapes used in the simulations were HTV (H-II Transfer Vehicle) Return Vehicle, a lift-type capsule under development in Japan, and a modified one that can suppress the self-excited oscillation proposed in a previous study. Three-dimensional dynamic mode decomposition was performed on the flow field obtained by fixed angle simulations, and it was suggested that the recirculation region at the back of the capsule may contribute largely to the onset of the self-excited oscillation. The fixed angle simulation and 1-DOF simulation indicated that the pressure at the shoulder of the modified shape is changed to resist the change in the pitch angle and suppress the self-excited oscillation.
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