Molecular scattering dynamics at hyperthermal velocities and its impact on low drag satellite
Project/Area Number |
19H02346
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 24010:Aerospace engineering-related
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Research Institution | Kobe University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
横田 久美子 神戸大学, 工学研究科, 助手 (20252794)
岩田 稔 九州工業大学, 大学院工学研究院, 准教授 (80396762)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2022)
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Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2021: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2020: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2019: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
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Keywords | 地球高層大気 / 大気密度 / 衛星大気抵抗 / 超低高度衛星 / 分子散乱 / 大気抵抗 / 原子状酸素 / 超低地球軌道 / 窒素分子 / 超低軌道 / 宇宙環境 / 宇宙機 / 超低軌道衛星 |
Outline of Research at the Start |
本申請では、これまで世界的にもその重要性が十分認識されてこなかった「衛星表面での超熱気体分子の散乱ダイナミクス」を正しく理解するために、本申請者が所有する材料劣化研究用原子状酸素ビーム発生装置を用いた実験によるデータ収集を行う。さらに超熱速度領域の原子状酸素散乱ダイナミクスとDSMC計算と組み合わせることにより、低抵抗衛星設計の基本原理の獲得と、DSMC計算スキームの高度化を行う。これらの一連の研究により世界に先駆けて超低高度地球軌道領域を開拓する基盤技術を獲得することを目指す。
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Outline of Final Research Achievements |
In this project, angular distribution of scattering atoms on satellite materials was measured in order to reduce atmospheric drag of VLEO satellites. The results showed that the molecular beam scattering from the polyimide surface was dominated by the specular reflection component, while the diffuse reflection component increased for the material irradiated by atomic oxygen. Similar changes were observed for the polyimide exposed to LEO environment on the ISS. The scattering distribution obtained in this experiment was implemented as a scattering model in DSMC calculations to calculate satellite drag. It was shown that the atmospheric drag increased by the exposure to atomic oxygen, and that the drag could be reduced by using a two-dimensional material with a predominant specular reflection component as the surface material.
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Academic Significance and Societal Importance of the Research Achievements |
超低軌道(VLEO)領域では大気密度が大きいため、衛星の低抵抗化が重要な設計ポイントとなる。VLEOでの大気分子流れは分子流領域であることから、超低軌道衛星の低抵抗化には航空機とは全く異なる超熱速度希薄流体力学の適用が必要となるが、実験設備がなかったことから世界的にも未踏の学術領域である。本研究では独自のシステムにより超熱分子速度領域の分子散乱を実験的に計測し、低抵抗衛星設計技術の確立を行った。
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Report
(4 results)
Research Products
(33 results)
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[Presentation] N2-acceleration effect on atomic oxygen-induced polyimide erosion in sub-LEO observed by SLATS/AOFS2022
Author(s)
Kumiko Yokota, Masahito Tagawa, Wataru Ide, Atsushi Fujita, Sasuga Horimoto, Santa Nishioka, Keisuke Ezaki, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Yugo Kimoto
Organizer
15th International Symposium on Materials in a Space Environment / 13th International Conference on Protection of Materials and Systems from Space Environment
Related Report
Int'l Joint Research
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[Presentation] Impact of neutral atmosphere environment on SLATS2022
Author(s)
Yugo Kimoto, Yuta Tsuchiya, Eiji Miyazaki, Aki Goto, Kazuki Yukumatsu, Shunsuke Imamura, Haruo Kawasaki, Masanori Sasaki, Kumiko Yokota, Masahito Tagawa, Wataru Ide, Atsushi Fujita, Shohei Urakawa, Sasuga Horimoto, Santa Nishioka
Organizer
15th International Symposium on Materials in a Space Environment / 13th International Conference on Protection of Materials and Systems from Space Environment
Related Report
Int'l Joint Research
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[Presentation] Atmospheric density probe for VLEO applications2021
Author(s)
Taishi Kato, Shoma Taira, Momoka Shimoi, Kumiko Yokota, Yoshinori Nakayama, Takashi Ozawa, Masahito Tagawa
Organizer
1st International Symposium on VLEO Missions and Technologies, Manchester, UK, June 28-29, 2021
Related Report
Int'l Joint Research
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[Presentation] VLEO-related research activities at Kobe University2021
Author(s)
Masahito Tagawa, Wataru Ide, Naoki Kano, Momoka Shimoi, Yuki Fukami, Kosuke Shoda, Taishi Kato, Kazuki Itatani, Atsushi Fujita, Sasuga Horimoto, Keisuke Ezaki, Shoma Taira, Yuki Jotaki, Kumiko Yokota
Organizer
1st International Symposium on VLEO Missions and Technologies, Manchester, UK, June 28-29, 2021
Related Report
Int'l Joint Research
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[Presentation] Molecular scattering at microstructured surface for rarefied gas compression inside air breathing ion engine2021
Author(s)
Kosuke Shoda, Naoki Kano, Yuki Jotaki, Keisuke Ezaki, Kazuki Itatani, Takashi Ozawa, Yusuke Yamashita, Kazutaka Nishiyama, Kumiko Yokota, Masahito Tagawa
Organizer
1st International Symposium on VLEO Missions and Technologies, Manchester, UK, June 28-29, 2021
Related Report
Int'l Joint Research
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[Presentation] AO density variations during geomagnetic anomaly observed by SLATS2021
Author(s)
Atsushi Fujita, Kumiko Yokota, Masahito Tagawa, Wataru Ide, Sasuga Horimoto, Yugo Kimoto, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Yasunobu Miyoshi
Organizer
2nd Applied Space Environments Conference, November 1-5, 2021, Online
Related Report
Int'l Joint Research
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[Presentation] Scattering behavior of thermal molecular beams at microstructured surface for high compression intake system of air breathing ion engine2021
Author(s)
Keisuke Ezaki, Kosuke Shoda, Kazuki Itatani, Yuki Jotaki, Yuki Jotaki, Yusaku Ashida, Koki Sugimoto, Takashi Ozawa, Yusuke Yamashita, Kazutaka Nishiyama, Kumiko Yokota, Masahito Tagawa
Organizer
33rd International Symposium on Space Technology and Science, February 26 - March 4, 2022, Online
Related Report
Int'l Joint Research
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[Presentation] Development of atmospheric density probe aboard S-520-32 sounding rocket2021
Author(s)
Shoma Taira, Taishi Kato, Momoka Shimoi, Taiga Adachi, Towa Ushijima, Yusuke Yamashita, Takashi Ozawa, Takumi Abe, Yoshinori Nakayama, Kumiko Yokota, Masahito Tagawa
Organizer
33rd International Symposium on Space Technology and Science, February 26 - March 4, 2022, Online
Related Report
Int'l Joint Research
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