The effectiveness of three-dimensional passive devices for flow control on low pressure turbine airfoils was investigated experimentally. A row of small cylinders was placed at the pressure minimum on the suction side of a typical airfoil. Cases with Reynolds numbers ranging from 25,000 to 300,000 (based on suction surface length and exit velocity) were considered under low freestream turbulence conditions. Streamwise pressure profiles and velocity profiles near the trailing edge were documented. Without flow control a separation bubble was present, and at the lower Reynolds numbers the bubble did not close. Cylinders with two different heights and a wide range of spanwise spacings were considered. Reattachment moved upstream as the cylinder height was increased or the spacing was decreased. If the spanwise spacing was sufficiently small, the flow at the trailing edge was essentially uniform across the span. The cylinder size and spacing could be optimized to minimize losses at a given Reynolds number, but cylinders optimized for low Reynolds number conditions caused increased losses at high Reynolds numbers. The effectiveness of two-dimensional bars had been studied previously under the same flow conditions. The cylinders were not as effective for maintaining low losses over a range of Reynolds numbers as the bars.
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e-mail: volino@usna.edu
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April 2006
Technical Papers
Experiments With Three-Dimensional Passive Flow Control Devices on Low-Pressure Turbine Airfoils
Douglas G. Bohl,
Douglas G. Bohl
Department of Mechanical Engineering,
United States Naval Academy
, Annapolis, MD 21402
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Ralph J. Volino
Ralph J. Volino
Department of Mechanical Engineering,
e-mail: volino@usna.edu
United States Naval Academy
, Annapolis, MD 21402
Search for other works by this author on:
Douglas G. Bohl
Department of Mechanical Engineering,
United States Naval Academy
, Annapolis, MD 21402
Ralph J. Volino
Department of Mechanical Engineering,
United States Naval Academy
, Annapolis, MD 21402e-mail: volino@usna.edu
J. Turbomach. Apr 2006, 128(2): 251-260 (10 pages)
Published Online: December 1, 2004
Article history
Received:
October 1, 2004
Revised:
December 1, 2004
Citation
Bohl, D. G., and Volino, R. J. (December 1, 2004). "Experiments With Three-Dimensional Passive Flow Control Devices on Low-Pressure Turbine Airfoils." ASME. J. Turbomach. April 2006; 128(2): 251–260. https://doi.org/10.1115/1.2137743
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