New, detailed flow field measurements are presented for a very large low-speed cascade representative of a high-pressure turbine rotor blade with turning of and blade chord of . Data were obtained for tip leakage and passage secondary flow at a Reynolds number of , based on exit velocity and blade axial chord. Tip clearance levels ranged from 0% to 1.68% of blade span (0% to 3% of blade chord). Particle image velocimetry was used to obtain flow field maps of several planes parallel to the tip surface within the tip gap, and adjacent passage flow. Vector maps were also obtained for planes normal to the tip surface in the direction of the tip leakage flow. Secondary flow was measured at planes normal to the blade exit angle at locations upstream and downstream of the trailing edge. The interaction between the tip leakage vortex and passage vortex is clearly defined, revealing the dominant effect of the tip leakage flow on the tip end-wall secondary flow. The relative motion between the casing and the blade tip was simulated using a motor-driven moving belt system. A reduction in the magnitude of the undertip flow near the end wall due to the moving wall is observed and the effect on the tip leakage vortex examined.
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e-mail: pepe.palafox@eng.ox.ac.uk
e-mail: martin.oldfield@eng.ox.ac.uk
e-mail: jlagraff@mame.syr.edu
e-mail: terry.jones@eng.ox.ac.uk
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January 2008
Research Papers
PIV Maps of Tip Leakage and Secondary Flow Fields on a Low-Speed Turbine Blade Cascade With Moving End Wall
P. Palafox,
P. Palafox
Department of Engineering Science,
e-mail: pepe.palafox@eng.ox.ac.uk
University of Oxford
, Oxford, OX1 3PJ, United Kingdom
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M. L. G. Oldfield,
M. L. G. Oldfield
Department of Engineering Science,
e-mail: martin.oldfield@eng.ox.ac.uk
University of Oxford
, Oxford, OX1 3PJ, United Kingdom
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J. E. LaGraff,
J. E. LaGraff
Department of Mechanical, Aerospace Engineering,
e-mail: jlagraff@mame.syr.edu
Syracuse University
, Syracuse, NY 13244
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T. V. Jones
T. V. Jones
Department of Engineering Science,
e-mail: terry.jones@eng.ox.ac.uk
University of Oxford
, Oxford, OX1 3PJ, United Kingdom
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P. Palafox
Department of Engineering Science,
University of Oxford
, Oxford, OX1 3PJ, United Kingdome-mail: pepe.palafox@eng.ox.ac.uk
M. L. G. Oldfield
Department of Engineering Science,
University of Oxford
, Oxford, OX1 3PJ, United Kingdome-mail: martin.oldfield@eng.ox.ac.uk
J. E. LaGraff
Department of Mechanical, Aerospace Engineering,
Syracuse University
, Syracuse, NY 13244e-mail: jlagraff@mame.syr.edu
T. V. Jones
Department of Engineering Science,
University of Oxford
, Oxford, OX1 3PJ, United Kingdome-mail: terry.jones@eng.ox.ac.uk
J. Turbomach. Jan 2008, 130(1): 011001 (9 pages)
Published Online: December 14, 2007
Article history
Received:
March 30, 2006
Revised:
April 4, 2006
Published:
December 14, 2007
Citation
Palafox, P., Oldfield, M. L. G., LaGraff, J. E., and Jones, T. V. (December 14, 2007). "PIV Maps of Tip Leakage and Secondary Flow Fields on a Low-Speed Turbine Blade Cascade With Moving End Wall." ASME. J. Turbomach. January 2008; 130(1): 011001. https://doi.org/10.1115/1.2437218
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