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|Title:||Investigation of Streamwise and Transverse Instabilities on Swept Cylinders and Implications for Turbine Blading|
|Authors:||Gostelow, J. Paul|
De Saint Jean, M.
Garrett, Stephen J.
|Presented at:||ASME Turbo Expo 2012, Copenhagen, Denmark|
|Publisher:||American Society of Mechanical Engineers (ASME)|
|Citation:||Proceedings of ASME Turbo Expo 2012, GT2012-69055|
|Abstract:||The starting point for this investigation was the observation of robust streamwise streaks in flow visualization on the suction surfaces of blades in a turbine cascade at subsonic and transonic speeds. The spanwise wavelength of an array of streamwise vortices had been predicted by Kestin and Wood and is here confirmed experimentally. Observations of streaks on unswept turbine blades and on circular cylinders confirmed these earlier predictions, providing a firm basis for referencing the new measurements of vortical behavior. The observations made it clear that the boundary layers are highly three dimensional. In this paper observations of streamwise and transverse instabilities on swept circular cylinders, over a range of inclinations, are presented. The circular cylinder is a canonical case and observations relate the streamwise vorticity of the unswept case to the more aggressive crossflow instability, at high sweep angles, studied by Poll. Introducing sweep brings consideration of a wide range of instabilities. Prominent is crossflow instability resulting from the inflectional behavior of a three-dimensional boundary layer.|
|Embargo on file until:||1-Jan-10000|
|Rights:||Copyright © 2012 by ASME.|
|Description:||Embargo length currently unknown. Permission to make the text available has been requested from the publisher and the full text may be made available once this has been received.|
|Appears in Collections:||Conference Papers & Presentations, Dept. of Engineering|
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