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The Effect of Large Free Stream Disturbances on the Stability of Two- and Three-Dimensional Stagnation Flow

Bippes, H. (1995) The Effect of Large Free Stream Disturbances on the Stability of Two- and Three-Dimensional Stagnation Flow. Euromech Colloquium, Prag, April 10-12, 1995.

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Abstract

One of the most crucial problems in transition research are two- and three-dimensional stagnation flows. In wind tunnel experiments numerous evidence has been found for the formation of streamwise vortices around attachment lines. These streamwise vortices distort the subsequent boundary-layer flow and change sthe stability characteristics of the velocity profiles so that transition is affected. In the past the appearance of streamwise vortices was attributed to centrifugal instability but recent analyses which assume exponentially decaying disturbances proved stagnation flow to be stable with resspect to centrifugal instability. Hence, the question arises what other instability mechanism could lead to the streamwise vortices observed. H. Ludwieg 1 suggested that large scale velocity fluctuations in the oncoming flow as appearing in turbomachinary e.g. could lead to such an instability.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1995, pages=1,
Title:The Effect of Large Free Stream Disturbances on the Stability of Two- and Three-Dimensional Stagnation Flow
Authors:
AuthorsInstitution or Email of Authors
Bippes, H.UNSPECIFIED
Date:1995
Status:Published
Keywords:Oscillating stagnation flow, Stability
Event Title:Euromech Colloquium, Prag, April 10-12, 1995
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
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 > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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