One of the important ways of improving turbomachinery compressor performance is to control three-dimensional (3D) separations, which form over the suction surface and end wall corner of the blade passage. Based on the insights gained into the formation of these separations, this paper illustrates how an appropriately applied boundary layer suction of up to 0.7% of inlet mass flow can control and eliminate typical compressor stator hub corner 3D separation over a range of operating incidence. The paper describes, using computational fluid dynamics, the application of suction on the blade suction surface and end wall boundary layers and exemplifies the influence of end wall dividing streamline in initiating 3D separation in the blade passage. The removal of the separated region from the blade suction surface is confirmed by an experimental investigation in a compressor cascade involving surface flow visualization, surface static pressure, and exit loss measurements. The ensuing passage flow field is characterized by increased blade loading (static pressure difference between pressure and suction surface), enhanced average static pressure rise, significant loss removal, and a uniform exit flow. This result also enables the contribution of the 3D separation to the overall loss and passage blockage to be assessed.
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January 2008
Research Papers
Control of Three-Dimensional Separations in Axial Compressors by Tailored Boundary Layer Suction
Semiu A. Gbadebo,
Semiu A. Gbadebo
Siemens Industrial Turbomachinery Ltd.
, Lincoln LN5 7FD, United Kingdom
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Nicholas A. Cumpsty,
Nicholas A. Cumpsty
Imperial College
, London SW7 2AZ, United Kingdom
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Tom P. Hynes
Tom P. Hynes
University of Cambridge
, Whittle Laboratory, Cambridge CB3 0DY, United Kingdom
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Semiu A. Gbadebo
Siemens Industrial Turbomachinery Ltd.
, Lincoln LN5 7FD, United Kingdom
Nicholas A. Cumpsty
Imperial College
, London SW7 2AZ, United Kingdom
Tom P. Hynes
University of Cambridge
, Whittle Laboratory, Cambridge CB3 0DY, United KingdomJ. Turbomach. Jan 2008, 130(1): 011004 (8 pages)
Published Online: December 19, 2007
Article history
Received:
November 18, 2005
Revised:
January 25, 2007
Published:
December 19, 2007
Citation
Gbadebo, S. A., Cumpsty, N. A., and Hynes, T. P. (December 19, 2007). "Control of Three-Dimensional Separations in Axial Compressors by Tailored Boundary Layer Suction." ASME. J. Turbomach. January 2008; 130(1): 011004. https://doi.org/10.1115/1.2749294
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