Curriculum Vitaes
Profile Information
- Affiliation
- Professor, Institute of Space and Astronautical Science, JAXA
- Degree
- 工学博士(東京大学)
- J-GLOBAL ID
- 200901061542880861
- researchmap Member ID
- 5000019456
Research History
5-
Feb, 2022 - Present
-
Feb, 2017 - Jan, 2022
-
Oct, 2003 - Jan, 2017
-
2001 - 2002
Education
1-
- 2001
Papers
152-
Cryogenics, 131 103652-103652, Apr, 2023
-
IEEE Transactions on Applied Superconductivity, 32(6) 1-5, 2022 Peer-reviewedThe critical heat flux in liquid hydrogen is ten times higher than that in liquid helium and is approximately half of that in liquid nitrogen. Since the resistivity of pure metal such as copper or silver at 20 K is less than one-hundredth of that at 300 K, HTS magnets immersed in liquid hydrogen are expected to satisfy the fully cyostable condition or to be stable against high resistive heat generation enough for quench detection at a practical current density. In order to examine cryostability of HTS magnets in liquid hydrogen, a pool-cooled Bi2223 magnet with a 5 T magnetic field at 20 K has been designed, fabricated and tested in liquid nitrogen prior to excitation tests in liquid hydrogen. The magnet consists of six outer double pancake coils with the inner diameter of 0.20 m and four inner double pancake coils with the outer diameter of 0.16 m. The resistive voltage to initiate thermal runaway in the coil as-sembly in liquid nitrogen was higher than 1 V that is sufficient high for quench detection.
-
日本航空宇宙学会論文集, 70(4), 2022
Misc.
164-
日本航空宇宙学会年会講演会講演集(CD-ROM), 54th, 2023
-
令和4年度宇宙輸送シンポジウム: 講演集録 = Proceedings of Space Transportation Symposium FY2022, Jan, 2023令和4年度宇宙輸送シンポジウム（2023年1月12日-13日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)) , 相模原市, 神奈川県 Space Transportation Symposium FY2022 (January 12-13, 2023. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan 資料番号: SA6000184015 STCP-2022-015
-
宇宙科学技術連合講演会講演集(CD-ROM), 66th, 2022
-
令和3年度宇宙輸送シンポジウム: 講演集録 = Proceedings of Space Transportation Symposium FY2021, Jan, 2022令和3年度宇宙輸送シンポジウム（2022年1月13日-14日. オンライン開催) Space Transportation Symposium FY2021 (January 13-14, 2022. Online Meeting) 著者人数: 12名 資料番号: SA6000173016 STCP-2021-016
Presentations
64-
Record of Joint Conference of Electrical and Electronics Engineers in Kyushu, 2010化石燃料の代替エネルギーとして水素利用が検討されている。水素は、気体よりも液体の方が密度が大きく利用しやすい。そこで、タンク内の液体水素の残量を高精度に連続的な測定が可能な液位センサが必要とされている。液体水素の大気圧下沸点は約20 Kであり、臨界温度が約39 KのMgB2超電導体が液体水素用の液位センサとして応用できる可能性がある。よって、SUS/FeシースMgB2線材を用いて超電導式液面計を試作し、その動作特性を実験的に評価した。
-
The Proceedings of Conference of Tohoku Branch, 2010
-
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity, Nov 18, 2009
-
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity, Nov 18, 2009
-
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity, Nov 18, 2009
-
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity, Nov 18, 2009
-
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity, Nov 18, 2009
-
日本流体力学会年会講演論文集, 2006First flight testing of Balloon-based Operation Vehicle (BOV) was carried out in 2006 and succeded. Second flight testing with a wing-body configuration will be done by a high-altitude balloon and dropped in September, 2006. Various types of onboard experiments such as a microgravity experiment and a demonstration of a supersonic engine are planned during flights for the third, fourth, and fifth flights. The aerodynamics load and characteristics of BOVs have been obtained by the CFD simulations as well as by the wind tunnel testing in ISAS. In this paper, the numerical simulations for BOV are presented and the results showed that the non-linear interaction between the wings, body, and engine exists for high angle of attack.
-
SPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2005For an application of PDE to hypersonic air-breathing engines, thrust performances of air-breathing PDEs are estimated analytically in this study. Thrust/weight ratio of the engine decreases with increasing flight speed because of a low density of atmospheric air. In order to improve this disadvantage, new concept air-breathing PDE is proposed. By closing the exit of the PDE combustion chamber during a filling phase, ram pressure of the intake can be utilized effectively. Furthermore, by cooling the intake exit air by the cryogenic fuel, flight range can be extended for M 0.5. After system analysis of the air-breathing PDE, PDRJE (Pulse Detonation Ram Jet Engine) with air precooler is proposed. Size of PDRJE is 0.3 m in cowl inlet diameter. Engine thrust and weight are estimated to be 4.6x103 N and 74 kg respectively. To evaluate the basic performances of the PDE, firing test of the scaled model was performed using GH2 and GOX. Heat flux of the combustion chamber was approximately 5 kW/m2/Hz.
-
NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 2004An accurate comprehensive optimization method of the TSTO spaceplane has been developed. A new aerodynamics model bases on the data obtained by accurate CFD simulations. Strong aerodynamic interaction occurs between the Booster and the Orbiter in the CFD simulations, and it indicates the importance of the accurate aerodynamics model. The optimization using the new aerodynamics model results in the heavier gross take-off weight compared to the result using the conventional aerodynamics model. Furthermore, multi-objective optimization, in which the gross take-off weight and the time at separation should be minimized, is also implemented. It indicates that the propulsion parameter which control the flow rate of captured air during supersonic flight plays an important role in the trade-off relation between these objectives.
Professional Memberships
3-
Apr, 2019 - Present
Research Projects
13-
科学研究費助成事業, 日本学術振興会, Apr, 2023 - Mar, 2027
-
科学研究費助成事業, 日本学術振興会, Apr, 2020 - Mar, 2023
-
Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2019 - Mar, 2022
-
Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2015 - Mar, 2018
-
Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, May, 2013 - Mar, 2018
