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Drag Reduction of a Sphere at Supercritical Reynolds Numbers using passive Ventilation

Lu, M. and Grosche, F. and Meier, G. (1999) Drag Reduction of a Sphere at Supercritical Reynolds Numbers using passive Ventilation. In: Mechanics of Passive and Aktive Flow Control Kluwer Academic Publishers. pp. 127-132.

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Abstract

This paper describles an experimental investigation of drag reduction of a sphere at supercritical Reynolds numbers up to Re = 4.5x1000000 using passive ventilation. This ventilation was created by a channel connecting the stagnation region with the wake region. Passiv ventilation is a very effective method of decreasing drag of smooth spheres in the named Reynolds numbers range. A drag reduction of about 40%-60% can be achieved with a cross-section area of the venting channel of about 2% of the sphere. Pressure distributions on the sphere show clear changes of base pressure and point of separation. In addition, the flow on the vented sphere showed smaller oscillations at supercritical Reynolds numbers than those on the basic sphere. The reduction in oscillation amplitude came basically from a stabilization of the wake. Flow visualization in a water tunnel was made for the basic and vented spheres. The visualization of the vented sphere showed more stabilization of the wake than that of the basic sphere

Document Type:Book Section
Additional Information: LIDO-Berichtsjahr=1999,
Title:Drag Reduction of a Sphere at Supercritical Reynolds Numbers using passive Ventilation
Authors:
AuthorsInstitution or Email of Authors
Lu, M.UNSPECIFIED
Grosche, F.UNSPECIFIED
Meier, G.UNSPECIFIED
Date:1999
Journal or Publication Title:Mechanics of Passive and Aktive Flow Control
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 127-132
Publisher:Kluwer Academic Publishers
Status:Published
Keywords:Drag reduction, bluff-body, ventilation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:42

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