File(s) under permanent embargo

Reason: This item is currently closed access.

Investigation of Streamwise and Transverse Instabilities on Swept Cylinders and Implications for Turbine Blading

conference contribution
posted on 11.07.2012, 15:50 by J. Paul Gostelow, Aldo Rona, M. De Saint Jean, Stephen J. Garrett, W.A. McMullan
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.

History

Citation

Proceedings of ASME Turbo Expo 2012, GT2012-69055

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Source

ASME Turbo Expo 2012, Copenhagen, Denmark

Version

VoR (Version of Record)

Published in

Proceedings of ASME Turbo Expo 2012

Publisher

American Society of Mechanical Engineers (ASME)

Copyright date

2012

Publisher version

http://www.asmeconferences.org/TE2012/SearchPaperSchedule.cfm

Notes

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.

Temporal coverage: start date

11/06/2012

Temporal coverage: end date

15/06/2012

Language

en

Usage metrics

Categories

Keywords

Exports