This paper describes an investigation into the behavior of the pressure surface separation at midspan in a linear cascade. It is found that the pressure surface separation can be a significant contributor to the profile loss of a thin, solid, low-pressure turbine blade that is typical of current engine designs. Numerical predictions are first used to study the inviscid behavior of the blade. These show a strong incidence dependence around the leading edge of the profile. Experiments then show clearly that all characteristics of the pressure surface separation are controlled primarily by the incidence. It is also shown that the effects of wake passing, freestream turbulence and Reynolds number are of secondary importance. A simple two-part model of the pressure surface flow is then proposed. This model suggests that the pressure surface separation is highly dissipative through the action of its strong turbulent shear. As the incidence is reduced, the increasing blockage of the pressure surface separation then raises the velocity in the separated shear layer to levels at which the separation can create significant loss.
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July 2002
Technical Papers
Pressure Surface Separations in Low-Pressure Turbines—Part 1: Midspan Behavior
Neil W. Harvey
Neil W. Harvey
Rolls-Royce, plc, Derby, UK
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Michael J. Brear
Howard P. Hodson
Neil W. Harvey
Rolls-Royce, plc, Derby, UK
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, New Orleans, Louisiana, June 4–7, 2001. Manuscript received by the IGTI, October 20, 2000. Paper No. 2001-GT-437. Review Chair: R. A. Natole.
J. Turbomach. Jul 2002, 124(3): 393-401 (9 pages)
Published Online: July 10, 2002
Article history
Received:
October 20, 2000
Online:
July 10, 2002
Citation
Brear, M. J., Hodson, H. P., and Harvey, N. W. (July 10, 2002). "Pressure Surface Separations in Low-Pressure Turbines—Part 1: Midspan Behavior ." ASME. J. Turbomach. July 2002; 124(3): 393–401. https://doi.org/10.1115/1.1450764
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