What is it about?
In order to investigate the effect of the center of gravity location on dynamic stability of the Hayabusa-type capsule at subsonic speeds and to analyze underlying causes, unsteady Reynolds-averaged Navier-Stokes (URANS) simulations are conducted for the Hayabusa-type capsule with forced oscillation at mainstream Mach number of 0.5.
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Why is it important?
This study confirmed that backward location of the center of the gravity makes worse dynamic stability of the capsule. It is also indicated that as the center of gravity location moves backward on the capsule’s axis of symmetry, stabilizing effect of the foreside of the capsule is weakened because of the change of the static stability of the foreside of the capsule and destabilizing effect of the rear side of the capsule is strengthened because of the change of the phase delay of the pitching moment caused by the rear side of the capsule against the capsule’s pitch motions. The size of the recirculation region behind the capsule was also investigated and found to vary with the presence or absence of capsule movement. These results confirm the importance of dynamic investigation for the effect of location of center of gravity on the dynamic stability.
Perspectives
This study confirms that it is not sufficient to investigate the effect of the center of gravity on the dynamic stability of the capsule only by examining the effect on the static stability of the capsule, but that an investigation of its dynamic properties is required.
AKIRA OYAMA
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Read the Original
This page is a summary of: Numerical Study on Dynamic Instability of Reentry Capsule at Subsonic Speeds, January 2024, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2024-2866.
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