Encounters with vortices in a turbine nozzle passage

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DOIResolve DOI: http://doi.org/10.1155/2012/928623
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Journal titleInternational Journal of Rotating Machinery
Article number928623
SubjectBase pressure; Blade wake; Blunt leading edges; Convex curvatures; Convex surfaces; Energy separations; Flowthrough; Horseshoe vortices; Linear cascade; Passage vortex; Separation regions; Shedding modes; Streamwise vortices; Subsonic speed; Suction surfaces; Surface flow visualization; Time resolved measurement; Transonic speed; Transonic turbine cascade; Turbine nozzles; Flow visualization; Secondary flow; Turbine components; Vorticity; Wakes; Vortex flow
AbstractExperiments 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. © 2012 J. P. Gostelow et al.
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AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21270097
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Record identifier6675d045-4f49-4e93-a0f2-8270bfd8b294
Record created2013-12-23
Record modified2016-05-09
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