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Other TitleNumerical analysis on subsonic and transonic aerodynamic characteristics of bullet train in tube
Author(jpn)若山 一樹; 鈴木 宏二郎
Author(eng)Wakayama, Kazuki; Suzuki, Kojiro
Author Affiliation(jpn)東京大学 大学院; 東京大学 大学院新領域創成科学研究科
Author Affiliation(eng)University of Tokyo Graduate School; University of Tokyo Graduate School of Frontier Sciences
Issue Date2008-02-29
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication title第39回流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2007論文集
Proceedings of 39th Fluid Dynamics Conference/Aerospace Numerical Simulation Symposium 2007
Start page33
End page38
Publication date2008-02-29
AbstractFor the purpose of reducing drag and further speeding up of high-speed train, the axisymmetric Navier-Stokes analyses have been numerically conducted around a bullet train running in depressurized tube. The flows around a simple axisymmetric body, which runs in high subsonic and transonic regimes at velocity more than 500 km/h and freestream pressure 0.001 atm, was solved for various tunnel diameters. When the train speed increases or the diameter of the tunnel decreases, the pressure on the nose tip of the train rises and the separation in the rear part of the train becomes more significant. As a result, the 'drag divergence' phenomena were observed on the plots of the relation between the drag coefficient and the freestream Mach number. The results show that when the tube is depressurized to 0.001 atm, further speeding up becomes possible with smaller power requirement than the existing Shinkansen bullet train.
DescriptionJAXA Special Publication
Keywordsrapid transit system; depressurized tube; aerodynamic force; aerodynamic coefficient; aerodynamic drag; computational fluid dynamics; Navier-Stokes equation; boundary layer separation; separated flow; aerodynamic characteristic; 高速輸送システム; 減圧チューブ; 流体力; 空力係数; 空力抵抗; 計算流体力学; ナビエ・ストークス方程式; 境界層剥離; 剥離流; 空力特性
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-07-016

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