Conference Paper 多様な飛行速度域でのMHD Flow Control に及ぼすホール効果の影響
Influence of Hall Effect on MHD Flow Control in Various Flight Velocities

下澤, 雄太  ,  益田, 克己  ,  藤野, 貴康  ,  Shimosawa, Yuta  ,  Masuda, Katsumi  ,  Fujino, Takayasu

Description
The influence of Hall effect on magnetohydrodynamic (MHD) flow control in various flight velocities is analyzed by axisymmetric two-dimensional MHD numerical simulations, in which the electrical interaction between the wall surface of a vehicle and the flowfield is taken into account. The flight velocities are parametrically varied in a range of 3.0 to 11 km/s under the three different flight altitude conditions: 55 km, 60 km, and 65 km. Numerical results show that the influence of Hall effect strongly depends on the flight velocity. In high flight velocity entries such as super orbital reentries where no strong Hall electric field is induced, MHD flow control can work well regardless of whether the wall surface is made of electrically insulating or conducting material. By contrast, in LEO reentries with flight velocities such as less than 8 km/s, MHD flow control cannot function at all under the electrically conducting wall condition. This is because the electrical interaction between the wall surface and the flowfield through a strong Hall effect significantly weakens the Lorentz force in a shock layer. However, when a conducting material covers only a small portion of wall around the stagnation point, MHD flow control would work well even in reentry situation with a strong Hall effect.
会議情報: 第47回流体力学講演会/第33回航空宇宙数値シミュレーション技術シンポジウム (2015年7月2日-3日. 東京大学生産技術研究所), 目黒区, 東京
形態: カラー図版あり
Meeting Information: 47th Fluid Dynamics Conference /the 33rd Aerospace Numerical Simulation Symposium (July 2-3, 2015. Institute of Industrial Science , the University of Tokyo), Meguro-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations
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