Study on non-equlibrium plasma flow characteristics with precoursa phenomena around high speed re-entry balistic bodyaround

• Project/Area Number: 17K06946
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aerospace engineering
• Research Institution: Tottori University
• Principal Investigator: KAWAZOE Hiromitsu 鳥取大学, 工学研究科, 教授 (40260591)
• Co-Investigator(Kenkyū-buntansha): 山田 剛治 東海大学, 工学部, 准教授 (90588831)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: プリカーサ / 衝撃波管 / 輻射光 / 衝撃波速度 / トリプルプローブ計測 / 分光計測 / 航空宇宙工学

Outline of Final Research Achievements

The objective of this study is to improve the prediction accuracy of atmospheric entry flight environments by characterizing the mechanism of thermochemical and radiative transfer phenomena (Precursor phenomena) occurring in the region ahead of shock waves around space vehicles.
In this study, a shock wave was generated in entry flight conditions using a shock tube. We have experimentally demonstrated precursor phenomena occur and clarify its characteristics by a probe and spectroscopic measurements. A computational fluid dynamics (CFD) code with photoionization model for Argon was developed and calculations were conducted showing a good agreement with experimental results in the region ahead of a shock wave.

Academic Significance and Societal Importance of the Research Achievements

従来の研究では、大気突入探査機周りに生成される衝撃層内の熱化学現象と輻射輸送現象のみに着目して研究が実施され、飛行環境の予測精度向上が行われてきた。しかしながら、本研究により、衝撃波前方領域でもプリカーサ現象が生じることが実験的にも数値的にも実証でき、それらが衝撃層内の特性に影響を及ぼすことが明らかになった。したがって、今後より多くの研究がプリカーサ現象に着目して高精度なプリカーサモデルを構築することで、大気突入飛行環境の予測精度を向上することが期待できる。

Research Products

• [Int'l Joint Research] クィーンズランド大学(オーストラリア)
• [Journal Article] Precursor phenomena ahead of a re-entry vehicle into Earth atmosphere (2019)
  • Author(s): H. Kawazoe, G. Yamada, K. Sakamoto
  • Journal Title: 46th EPS Conference on Plasma Physics (EPS2019) Volume: Vol. 43C Pages: 1184-1187
• [Presentation] 自由ピストン駆動型衝撃波管によるプリカーサ現象の実験・検証 (2020)
  • Author(s): 後藤佑都、松下 昂、山田剛治、坂本憲一、川添博光
  • Organizer: 日本機械学会中国四国支部学生会 第50回学生員卒業研究発表講演会
• [Presentation] 自由ピストン駆動型衝撃波管を用いた衝撃波前方領域におけるトリプルプローブによるプリカーサ輻射加熱の実証 (2019)
  • Author(s): 松下 昂、後藤佑都、坂本憲一、山田剛治、川添博光
  • Organizer: 第56回日本航空宇宙学会 関西・中部支部合同秋期大会
• [Presentation] Precursor phenomena ahead of a re-entry vehicle into Earth atmosphere (2019)
  • Author(s): H. Kawazoe, G. Yamada, K. Sakamoto
  • Organizer: 46th EPS Conference on Plasma Physics
  • Int'l Joint Research
• [Presentation] Nonequilibrium Radiation of Shock-heated Plasmas with Precursor phenomena (2019)
  • Author(s): Yamada, G., Kajino, M., and Kawazoe, H.
  • Organizer: AIAA Scitech 2019 Forum
  • Int'l Joint Research
• [Presentation] Internal energy relaxation processes of nitrogen plasmas at different electronic states in an entry flight condition (2018)
  • Author(s): Yamada, G., Kajino, M., and Kawazoe, H.
  • Organizer: 45th EPS Conference on Plasma Physics
  • Int'l Joint Research
• [Remarks] プリカーサ現象を伴う超高速再突入飛翔体周りの非平衡プラズマ流の特性解明
  • URL: http://www.mech.tottori-u.ac.jp/ryutai/research.html
• [Remarks] プリカーサ現象を伴う超高速再突入飛翔体周りの非平衡プラズマ流の特性解明
  • URL: http://www.mech.tottori-u.ac.jp/ryutai/research/precursor.html