Role of on-board discharge in shock wave drag reduction and plasma cloaking
Qiu Xiao-Ming(邱孝明)a)†, Tang De-Li (唐德礼)a), Sun Ai-Ping(孙爱萍)a), Liu Wan-Dong(刘万东)b), and Zeng Xue-Jun (曾学军)c)
a Southwestern Institute of Physics, Chengdu 610041, China; b Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; c China Aerodynamics Research and Development Center, Mianyang 621000, China
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.
Received: 22 February 2006
Revised: 03 August 2006
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 40390150 and
10005001).
Cite this article:
Qiu Xiao-Ming(邱孝明), Tang De-Li (唐德礼), Sun Ai-Ping(孙爱萍), Liu Wan-Dong(刘万东), and Zeng Xue-Jun (曾学军) Role of on-board discharge in shock wave drag reduction and plasma cloaking 2007 Chinese Physics 16 186
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