Role of on-board discharge in shock wave drag reduction and plasma cloaking |
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Authors: | Qiu Xiao-Ming Tang De-Li Sun Ai-Ping Liu Wan-Dong and Zeng Xue-Jun |
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Institution: | Southwestern Institute of Physics, Chengdu 610041, China; Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; China Aerodynamics Research and Development Center, Mianyang 621000, China |
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Abstract: | In the present paper, a physical model is proposed for reducing the
problem of the drag reduction of an attached bow shock around the
nose of a high-speed vehicle with on-board discharge, to the problem
of a balance between the magnetic pressure and gas pressure of plane
shock of a partially ionized gas consisting of the environmental gas
around the nose of the vehicle and the on-board discharge-produced
plasma. The relation between the shock strength and the
discharge-induced magnetic pressure is studied by means of a set of
one-fluid, hydromagnetic equations reformed for the present purpose,
where the discharge-induced magnetic field consists of the electron
current (produced by the discharge)-induced magnetic field and the
partially ionized gas flow-induced one. A formula for the relation
between the above parameters is derived. It shows that the
discharge-induced magnetic pressure can minimize the shock strength,
successfully explaining the two recent experimental observations on
attached bow shock mitigation and elimination in a supersonic flow
during on-board discharge Phys. Plasmas 9 (2002) 721 and
Phys. Plasmas 7 (2000) 1345]. In addition, the formula
implies that the shock elimination leaves room for a layer of
higher-density plasma rampart moving around the nose of the vehicle,
being favourable to the plasma radar cloaking of the vehicle. The
reason for it is expounded. |
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Keywords: | attached bow shock and magnetohydrodynamic (MHD) drag reduction on-board discharges plasma cloaking MHD and fluid equation |
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