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Aerodynamic-Heating Analysis of Sample-Return Capsule in Future Trojan-Asteroid Exploration

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Title: Aerodynamic-Heating Analysis of Sample-Return Capsule in Future Trojan-Asteroid Exploration
Authors: Takahashi, Yusuke Browse this author →KAKEN DB
Yamada, Kazuhiko Browse this author
Issue Date: Jul-2018
Publisher: The American Institute of Aeronautics and Astronautics
Journal Title: Journal of thermophysics and heat transfer
Volume: 32
Issue: 3
Start Page: 547
End Page: 559
Publisher DOI: 10.2514/1.T4837
Abstract: In sample-return missions, the reentry velocity of a sample-return capsule is expected to be approximately 15km/s; however, the reentry velocity of the Hayabusa sample-return capsule was 11.8km/s. Strong aerodynamic heating caused by a high velocity can damage the capsule during reentry. To overcome this, two designs of high-velocity reentry capsules were proposed. In one design, a rigid flare was attached to decrease the ballistic coefficient by increasing the front projected area. In the other design, the conventional Hayabusa sample-return capsule was used with no modifications. In this study, the aerodynamic heating of the high-velocity reentry capsules and the Hayabusa sample-return capsule was analyzed using numerical simulations. Plasma flow in the shock layer at the front of the capsules and expansion flow in the wake region around the capsules were investigated. The profiles of convective and radiative heat fluxes on the surfaces of these capsules were predicted. The heat fluxes at the stagnation points predicted by the present numerical simulation were in good agreement with that of the empirical models. At the strongest aerodynamic-heating altitude, the total heat fluxes at the rear of the high-velocity reentry capsules and the Hayabusa sample-return capsule were approximately 2% of those in front of the capsules.
Rights: © 2018 American Institute of Aeronautics and Astronautics
Type: article (author version)
URI: http://hdl.handle.net/2115/71226
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 裕介

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