A detailed investigation of the flow physics occurring on the suction side of a simulated low pressure turbine (LPT) blade was performed. A contoured upper wall was designed to simulate the pressure distribution of an actual LPT blade onto a flat plate. The experiments were carried out at Reynolds numbers of 100,000 and 250,000 with three levels of freestream turbulence. The main emphasis in this paper is placed on flow field surveys performed at a Reynolds number of 100,000 with levels of freestream turbulence ranging from 0.8 percent to 3 percent. Smoke-wire flow visualization data were used to confirm that the boundary layer was separated and formed a bubble. The transition process over the separated flow region is observed to be similar to a laminar free shear layer flow with the formation of a large coherent eddy structure. For each condition, the locations defining the separation bubble were determined by careful examination of pressure and mean velocity profile data. Transition onset location and length determined from intermittency profiles decrease as freestream turbulence levels increase. Additionally, the length and height of the laminar separation bubbles were observed to be inversely proportional to the levels of freestream turbulence. [S0098-2202(00)00701-X]
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March 2000
Technical Papers
Experimental Investigation of Boundary Layer Behavior in a Simulated Low Pressure Turbine
Rickey J. Shyne, Senior Research Engineer,,
Rickey J. Shyne, Senior Research Engineer,
NASA Glenn Research Center, Cleveland, OH 44135
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Ki-Hyeon Sohn, Research Associate,,
Ki-Hyeon Sohn, Research Associate,
University of Toledo, Toledo, OH 43606
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Kenneth J. De Witt, Professor,
Kenneth J. De Witt, Professor,
University of Toledo, Toledo, OH 43606
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Rickey J. Shyne, Senior Research Engineer,
NASA Glenn Research Center, Cleveland, OH 44135
Ki-Hyeon Sohn, Research Associate,
University of Toledo, Toledo, OH 43606
Kenneth J. De Witt, Professor,
University of Toledo, Toledo, OH 43606
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division December 16, 1998; revised manuscript received August 30, 1999. Associate Technical Editor: D. R. Williams.
J. Fluids Eng. Mar 2000, 122(1): 84-89 (6 pages)
Published Online: August 30, 1999
Article history
Received:
December 16, 1998
Revised:
August 30, 1999
Citation
Shyne, R. J., Sohn, K., and De Witt, K. J. (August 30, 1999). "Experimental Investigation of Boundary Layer Behavior in a Simulated Low Pressure Turbine ." ASME. J. Fluids Eng. March 2000; 122(1): 84–89. https://doi.org/10.1115/1.483229
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