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Drag reduction by controlled base flow separation

Menezes, V and Takayama, K and Sun, M and Gopalan, J and Reddy, KPJ (2006) Drag reduction by controlled base flow separation. In: Journal Of Aircraft, 43 (5). pp. 1558-1561.

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THEproblem of wake .ow at high speeds and the drag associated with it are a signi.cant source of observation in the design of missiles, projectiles, and other typical high-speed vehicles. A large wake at the base of a vehicle would cause an increase in the overall drag due to the reduced base pressure. The wake studies of highspeed bodies also gain importance due to the severe aerodynamic heating problem and a high rise in the temperature of the base .ow. Many methods were devised to reduce the base drag of such highspeed bodies. These included boat tailing, base bleed, base combustion, locked vortex afterbodies, ventilated cavities, etc. Among these methods, the boat-tailed or conical afterbody concept was very popular and was found very effective in reducing base drag. But to achieve this drag reduction, the length of the conical/boattailed afterbody has to be suf.ciently large, terminating in a sharp trailing end. A short, conical/boat-tailed afterbody does not offer a suf.cient pressure recovery on its surface and, moreover, incurs considerable skin friction drag. On the other hand, using a short multistep afterbody that utilizes the concept of controlled .ow separation at the base of the vehicle can work out to be a better method of reducing base drag, provided a careful optimization of the con.guration geometry is carried out; thereby, permitting the use of shorter, lighter, and hence possibly lower cost afterbodies [1].

Item Type: Journal Article
Publication: Journal Of Aircraft
Publisher: American Institute of Aeronautics and Astronautics
Additional Information: Copyright of this article belongs to American Institute of Aeronautics and Astronautics.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 23 Mar 2009 06:56
Last Modified: 19 Sep 2010 05:25
URI: http://eprints.iisc.ac.in/id/eprint/18742

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