Shear layers shed by aircraft wings roll up into vortices. A similar, though far less common, phenomenon can occur in the wake of a turbomachine blade. This paper presents experimental data from a new single stage turbine that has been commissioned at the Whittle Laboratory. Two low aspect ratio stators have been tested with the same rotor row. Surface flow visualisation illustrates the extremely strong secondary flows present in both NGV designs. These secondary flows lead to conventional passage vortices but also to an intense vortex sheet which is shed from the trailing edge of the blades. Pneumatic probe traverses show how this sheet rolls up into a concentrated vortex in the second stator design, but not in the first. A simple numerical experiment is used to model the shear layer instability and the effects of trailing edge shape and exit yaw angle distribution are investigated. It is found that the latter has a strong influence on shear layer rollup: inhibiting the formation of a vortex downstream of NGV 1 but encouraging it behind NGV 2.
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ASME Turbo Expo 2002: Power for Land, Sea, and Air
June 3–6, 2002
Amsterdam, The Netherlands
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-3610-X
PROCEEDINGS PAPER
An Experimental and Computational Study of the Formation of a Streamwise Shed Vortex in a Turbine Stage
Graham Pullan,
Graham Pullan
University of Cambridge, Cambridge, UK
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John Denton,
John Denton
University of Cambridge, Cambridge, UK
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Michael Dunkley
Michael Dunkley
University of Cambridge, Cambridge, UK
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Graham Pullan
University of Cambridge, Cambridge, UK
John Denton
University of Cambridge, Cambridge, UK
Michael Dunkley
University of Cambridge, Cambridge, UK
Paper No:
GT2002-30331, pp. 71-79; 9 pages
Published Online:
February 4, 2009
Citation
Pullan, G, Denton, J, & Dunkley, M. "An Experimental and Computational Study of the Formation of a Streamwise Shed Vortex in a Turbine Stage." Proceedings of the ASME Turbo Expo 2002: Power for Land, Sea, and Air. Volume 5: Turbo Expo 2002, Parts A and B. Amsterdam, The Netherlands. June 3–6, 2002. pp. 71-79. ASME. https://doi.org/10.1115/GT2002-30331
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