2022 Fiscal Year Final Research Report
Mathematical modeling of the dynamically unstable oscillation of atmospheric entry capsule in deceleration
| Project/Area Number |
21K20390
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Iwate University |
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Principal Investigator |
Takeda Yuki 岩手大学, 理工学部, 助教 (70911634)
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| Project Period (FY) |
2021-08-30 – 2023-03-31
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| Keywords | 大気突入カプセル / 数値流体解析 |
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| Outline of Final Research Achievements |
Dynamic instability of the atmospheric entry capsule is a well-known problem that potentially causes parachute deployment failure. This study aims to reproduce the pitching oscillations caused by the aerodynamic force by the numerical simulation. Furthermore, this study aims to obtain fundamental information for the modeling of the pitching oscillation during the deceleration of the atmospheric entry capsule.
Numerical simulations of this study achieve to reproduce the subsonic-type oscillation and supersonic-type oscillation of the atmospheric entry capsule as well as the experiment. Furthermore, the Mach number dependency of the phase advance in the dynamic component of the pitching moment is revealed.
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| Free Research Field |
航空宇宙工学
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| Academic Significance and Societal Importance of the Research Achievements |
カプセルのまわりの流れ場が誘起するピッチング運動の再現が可能な数値シミュレーションコードを開発しました．また，その数値シミュレーションコードを用いて亜音速および超音速領域における特徴的なピッチング振動形態の再現に成功しました．
数値シミュレーションにより得られたピッチングモーメントの時間履歴に対して後処理を行うことで，従来明らかでなかったピッチングモーメントの動的成分に生じる位相進みのマッハ数依存性を明らかにしました．今後，得られたデータをもとに減速時の動的不安定現象を再現することが可能なモデル式の構築を目指します．
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