Influences of trailing boundary layer velocity profiles on wake vortex formation in a high-subsonic-turbine cascade

Influences of trailing boundary layer velocity profiles on wake vortex formation in a... In this paper, delayed detached eddy simulations are performed to study wake flows of a turbine blade at a high subsonic exit Mach number, M2,is=0.79, and high Reynolds number, Re=2.7-2.8×106, based on the chord length and outlet velocity. It is found that a slight change in the trailing suction profile would have a big influence on the formation of wake vortex street, which is believed to be caused by the change in the boundary layer state near the trailing edge, and suction boundary layer with a fuller velocity profile tends to destabilize the wake flow, promoting the generation of wake vortex and enhancing the unsteady effect. Local spatial-temporal stability analyses of the wake velocity profiles suggest that wake flows with asymmetric velocity profiles might have a stabilizing effect. It is suggested that the vortex formation and its strength can be controlled by making some slight modifications on the rear blade suction surface, and the mixing loss in the wake can be reduced due to a weaker unsteady effect. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy SAGE

Influences of trailing boundary layer velocity profiles on wake vortex formation in a high-subsonic-turbine cascade

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Publisher
SAGE
Copyright
© IMechE 2018
ISSN
0957-6509
eISSN
2041-2967
D.O.I.
10.1177/0957650918779935
Publisher site
See Article on Publisher Site

Abstract

In this paper, delayed detached eddy simulations are performed to study wake flows of a turbine blade at a high subsonic exit Mach number, M2,is=0.79, and high Reynolds number, Re=2.7-2.8×106, based on the chord length and outlet velocity. It is found that a slight change in the trailing suction profile would have a big influence on the formation of wake vortex street, which is believed to be caused by the change in the boundary layer state near the trailing edge, and suction boundary layer with a fuller velocity profile tends to destabilize the wake flow, promoting the generation of wake vortex and enhancing the unsteady effect. Local spatial-temporal stability analyses of the wake velocity profiles suggest that wake flows with asymmetric velocity profiles might have a stabilizing effect. It is suggested that the vortex formation and its strength can be controlled by making some slight modifications on the rear blade suction surface, and the mixing loss in the wake can be reduced due to a weaker unsteady effect.

Journal

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and EnergySAGE

Published: Jan 1, 2018

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