tailieunhanh - Wind Tunnels and Experimental Fluid Dynamics Research Part 17

Tham khảo tài liệu 'wind tunnels and experimental fluid dynamics research part 17', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 628 Wind Tunnelsand Experimental Fluid Dynamics Research Zuev . Banakh . Pokasov . 1988 . Optics of the Turbulent Atmosphere. Gidrometeoizdat. ISBN 5286000533 Leningrad. 31 Guidance of a Supersonic Projectile by Plasma-Actuation Concept Patrick Gnemmi and Christian Rey French-German Research Institute of Saint-Louis ISL France 1. Introduction The change in the trajectory of a flying vehicle is made possible by unbalancing the pressures exerted on the body surface. This pressure imbalance can be produced by the deployment of control surfaces Berner Dupuis 2001 Dupuis Berner 2001 Berner Dupuis 2002 Berner et al. 2002 Dupuis et al. 2004 Srulijes et al. 2004 Patel et al. 2002 Silton 2004 Massey et al. 2004 or by the use of one or more pyrotechnical mechanisms judiciously distributed along the vehicle Gnernmi Seiler 2000 Schafer et al. 2001 Seiler et al. 2003 Gnernmi Schafer 2005 Havermann et al. 2005 Yamanaka Tanaka 1996 . In the case of supersonic projectiles the major drawback to using the surface spreading technique is that large forces are involved in the deployment of surfaces in order to overcome the very high pressures encountered at high velocities. Thus the use of pyrotechnical mechanisms is more appropriate for high-speed vehicles but the fact that the pyrotechnical mechanism works only once and produces all or nothing is a main drawback when a controlled angle of attack must be given. The application concerns guided anti-aerial projectiles launched by a 40-mm gun and designed to increase their precision when faced with increasingly agile aerial vehicles flying up to a few kilometers of altitude. The underlying idea consists of giving the projectiles a maneuvering capacity allowing them to compensate for the trajectory prediction error. In the case of a high-speed vehicle a shock wave occurs at its nose tip or ahead of it depending on the nose geometry when the vehicle flies without any angle of attack the pressures distributed on its surface balance

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