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Title: Encounters with vortices in a turbine nozzle passage
Authors: Gostelow, J. Paul
Mahallati, A.
Carscallen, W.E.
Rona, Aldo
First Published: 2012
Publisher: Hindawi Publishing Corporation
Citation: International Journal of Rotating Machinery, 2012, 2012, pp. 1-10 (10)
Abstract: Experiments were conducted on the flow through a transonic turbine cascade. Secondary flows and a wide range of vortex types were encountered, including horseshoe vortices, shock-induced passage vortices, and streamwise vortices on the suction surface. In the separation region on the suction surface, a large rollup of passage vorticity occurred. The blunt leading edge gave rise to strong horseshoe vortices and secondary flows. The suction surface had a strong convex curvature over the forward portion and was quite flat further downstream. Surface flow visualization was performed and this convex surface displayed coherent streamwise vorticity. At subsonic speeds, strong von Kármán vortex shedding resulted in a substantial base pressure deficit. For these conditions, time-resolved measurements were made of the Eckert-Weise energy separation in the blade wake. At transonic speeds, exotic shedding modes were observed. These phenomena all occurred in experiments on the flow around one particular turbine nozzle vane in a linear cascade.
DOI Link: 10.1155/2012/928623
ISSN: 1023-621X
eISSN: 1542-3034
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2012 J. P. Gostelow et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Appears in Collections:Published Articles, Dept. of Engineering

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