An approach to endwall contouring has been developed with the goal of reducing secondary losses in highly loaded axial flow turbines. The present paper describes an experimental assessment of the performance of the contouring approach implemented in a low-speed linear cascade test facility. The study examines the secondary flows of a cascade composed of Pratt & Whitney PAKB airfoils. This airfoil has been used extensively in low-pressure turbine research, and the present work adds intrapassage pressure and velocity measurements to the existing database. The cascade was tested at design incidence and at an inlet Reynolds number of 126,000 based on inlet midspan velocity and axial chord. Quantitative results include seven-hole pneumatic probe pressure measurements downstream of the cascade to assess blade row losses and detailed seven-hole probe measurements within the blade passage to track the progression of flow structures. Qualitative results take the form of oil surface flow visualization on the endwall and blade suction surface. The application of endwall contouring resulted in lower secondary losses and a reduction in secondary kinetic energy associated with pitchwise flow near the endwall and spanwise flow up the suction surface within the blade passage. The mechanism of loss reduction is discussed in regard to the reduction in secondary kinetic energy.
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e-mail: dknezevi@connect.carleton.ca
e-mail: ssjoland@mae.carleton.ca
e-mail: thomas.praisner@pw.utc.com
e-mail: eunice.allen-bradley@pw.utc.com
e-mail: eric.grover@pw.utc.com
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January 2010
Research Papers
Measurements of Secondary Losses in a Turbine Cascade With the Implementation of Nonaxisymmetric Endwall Contouring
D. C. Knezevici,
D. C. Knezevici
Department of Mechanical and Aerospace Engineering,
e-mail: dknezevi@connect.carleton.ca
Carleton University
, Ottawa, ON, K1S 5B6, Canada
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S. A. Sjolander,
S. A. Sjolander
Professor
Department of Mechanical and Aerospace Engineering,
e-mail: ssjoland@mae.carleton.ca
Carleton University
, Ottawa, ON, K1S 5B6, Canada
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T. J. Praisner,
T. J. Praisner
Turbine Aerodynamics, United Technologies,
e-mail: thomas.praisner@pw.utc.com
Pratt & Whitney Aircraft
, 400 Main Street, MS 169-29, East Hartford, CT 06108
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E. Allen-Bradley,
E. Allen-Bradley
Turbine Aerodynamics, United Technologies,
e-mail: eunice.allen-bradley@pw.utc.com
Pratt & Whitney Aircraft
, 400 Main Street, MS 169-29, East Hartford, CT 06108
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E. A. Grover
E. A. Grover
Turbine Aerodynamics, United Technologies,
e-mail: eric.grover@pw.utc.com
Pratt & Whitney Aircraft
, 400 Main Street, MS 169-29, East Hartford, CT 06108
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D. C. Knezevici
Department of Mechanical and Aerospace Engineering,
Carleton University
, Ottawa, ON, K1S 5B6, Canadae-mail: dknezevi@connect.carleton.ca
S. A. Sjolander
Professor
Department of Mechanical and Aerospace Engineering,
Carleton University
, Ottawa, ON, K1S 5B6, Canadae-mail: ssjoland@mae.carleton.ca
T. J. Praisner
Turbine Aerodynamics, United Technologies,
Pratt & Whitney Aircraft
, 400 Main Street, MS 169-29, East Hartford, CT 06108e-mail: thomas.praisner@pw.utc.com
E. Allen-Bradley
Turbine Aerodynamics, United Technologies,
Pratt & Whitney Aircraft
, 400 Main Street, MS 169-29, East Hartford, CT 06108e-mail: eunice.allen-bradley@pw.utc.com
E. A. Grover
Turbine Aerodynamics, United Technologies,
Pratt & Whitney Aircraft
, 400 Main Street, MS 169-29, East Hartford, CT 06108e-mail: eric.grover@pw.utc.com
J. Turbomach. Jan 2010, 132(1): 011013 (10 pages)
Published Online: September 17, 2009
Article history
Received:
September 8, 2008
Revised:
October 29, 2008
Published:
September 17, 2009
Citation
Knezevici, D. C., Sjolander, S. A., Praisner, T. J., Allen-Bradley, E., and Grover, E. A. (September 17, 2009). "Measurements of Secondary Losses in a Turbine Cascade With the Implementation of Nonaxisymmetric Endwall Contouring." ASME. J. Turbomach. January 2010; 132(1): 011013. https://doi.org/10.1115/1.3072520
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