The role of streamwise vorticity in flows over turbomachine blade suction surfaces

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Proceedings titleProceedings of the ASME Turbo Expo
ConferenceASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011, 6 June 2011 through 10 June 2011, Vancouver, BC
Pages10911102; # of pages: 12
SubjectBlade suction surface; Blunt leading edges; Compressor blading; Computational work; Laminar separations; Leading edge; Low Reynolds number flow; On-surface flow; Physical behaviors; Pressure surface; Spatial resolution; Streamwise vortices; Suction surfaces; Time resolution; Turbine blade; Turbomachines; Exhibitions; Flow visualization; Reynolds number; Turbines; Turbomachine blades; Vorticity
AbstractStreamwise streaks and vortices are frequently encountered in low Reynolds number flows over blading. Observations have shown that, in addition to flows over concave pressure surfaces, convex suction surfaces are also influenced by streamwise vortices. These observations are based on surface flow visualization studies and computational work with highly resolved Large Eddy Simulation. Fine scale organized streaks exist in the laminar regions of turbine and compressor blading and are predictable. For a turbine blade with a blunt leading edge, at Reynolds numbers typical of aircraft cruise conditions, the streamwise vorticity may persist, on a time-average basis, to influence the entire suction surface. Time resolution is required to capture the flow complexity that is fundamental for an understanding of the physical behavior of the laminar boundary layer and its separation and transition. Progress has been made in modeling and predicting transition and laminar separation and the new findings of interesting vortical behavior need to be incorporated. In the leading edge region spanwise vorticity may promote early transition and bubble closure; further downstream streamwise vorticity may become established. The physics of this streamwise vorticity imposes severe requirements on the temporal and spatial resolution of both experimental and computational methods. A narrow spanwise computational strip does not allow the streamwise vorticity to settle into an organized pattern; if it is to become organized, an adequate spanwise domain is required. Copyright © 2010 by ASME.
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AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21271736
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Record identifier061a599f-b1ad-4c52-b61b-0dc3ec76ec08
Record created2014-03-24
Record modified2016-05-09
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