Associate for Education and Public Outreach

永田 靖典

ナガタ ヤスノリ  (Yasunori Nagata)

基本情報

所属
国立研究開発法人宇宙航空研究開発機構 宇宙科学研究所 特任助教

J-GLOBAL ID
201801011372441836
researchmap会員ID
B000340761

論文

 48
  • Takashi Miyashita, Yuji Sugihara, Yusuke Takahashi, Yasunori Nagata, Hisashi Kihara
    Journal of Physics D: Applied Physics 57(32) 325206-325206 2024年5月20日  
    Abstract Communication blackouts during atmospheric reentry pose significant challenges to the safety and adaptability of spacecraft missions. This phenomenon, caused by the attenuation of electromagnetic waves by the plasma surrounding the spacecraft, disrupts communication with ground stations or orbiting satellites. Therefore, it is crucial to decrease the plasma density in the vicinity of the spacecraft to ensure an unobstructed electromagnetic wave communication path. This study proposes a methodology that involves the injection of gas from the vehicle’s wall to create an insulating layer near the surface. This thin layer maintains lower temperatures and reduced plasma density, enabling electromagnetic wave propagation without attenuation. Practical experiments were conducted in an arc-heating facility to simulate atmospheric reentry conditions. The results of the experiments provided empirical evidence of the effectiveness of the technique in mitigating communication blackout phenomena. Numerical fluid analysis within the wind tunnel chamber validated the formation of an air film layer near the experimental model owing to the injected gas. Schlieren imaging revealed distinctive jet shapes, which corroborated the findings of the numerical analysis. The wind tunnel tests that simulated atmospheric reentry environments confirmed the formation of an air film layer through gas injection, which substantiates the reduction in communication blackout. These results have the potential to improve communication reliability in space transport.
  • Hideto Takasawa, Tomoya Fujii, Yusuke Takahashi, Takahiro Moriyoshi, Hiroki Takayanagi, Yasunori Nagata, Kazuhiko Yamada
    CEAS Space Journal 2024年4月26日  
  • 山田和彦, 小野稜介, 八木邑磨, 中尾達郎, 髙栁大樹, 杉本諒, 久保田笙太, 丸祐介, 小澤宇志, 永田靖典, 今井駿, 永井大樹, 森英之
    宇宙航空研究開発機構研究開発報告: 大気球研究報告 JAXA-RR-23-003 77-104 2024年2月  査読有り
  • 宮下岳士, 高澤秀人, 玉井亮多, 平田耕志郎, 若林海人, 吉雄忠行, 山本春佳, 丹野茉莉枝, 高橋裕介, 永田靖典, 山田和彦
    宇宙航空研究開発機構研究開発報告: 大気球研究報告 JAXA-RR-23-003 59-75 2024年2月  査読有り
  • Kazuhiko YAMADA, Takahiro MORIYOSHI, Kazushige MATSUMARU, Hiroki KANEMARU, Takahiro ARAYA, Kojiro SUZUKI, Osamu IMAMURA, Daisuke AKITA, Yasunori NAGATA, Yasumasa WATANABE
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 67(4) 224-233 2024年  

MISC

 111

書籍等出版物

 1
  • Marić Tomislav, Höpken Jens, Mooney Kyle, 柳瀬 真一郎, 高見 敏弘, 早水 庸隆, 早水 英美, 権田 岳, 武内 秀樹, 永田 靖典
    森北出版 2017年 (ISBN: 9784627670914)

講演・口頭発表等

 67

担当経験のある科目(授業)

 1

共同研究・競争的資金等の研究課題

 6