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TECHNICAL PAPERS

Experiments With Three-Dimensional Passive Flow Control Devices on Low-Pressure Turbine Airfoils

[+] Author and Article Information
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 21402volino@usna.edu

J. Turbomach 128(2), 251-260 (Dec 01, 2004) (10 pages) doi:10.1115/1.2137743 History: Received October 01, 2004; Revised December 01, 2004

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.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the test section

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Figure 2

Scale drawing of suction side airfoil showing location of (a) bar, or (b) cylinders

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Figure 3

Pressure profiles, large cylinders, Re=25,000, z∕P=0

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Figure 4

Pressure profiles, large cylinders, Re=50,000, (a)z∕P=0, (b)z∕P=0.5

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Figure 5

Pressure profiles, large cylinders, Re=100,000, (a)z∕P=0, (b)z∕P=0.5

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Figure 6

Pressure profiles, small cylinders, Re=100,000, z∕P=0

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Figure 7

Pressure profiles, small cylinders, Re=200,000, z∕P=0

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Figure 8

Trailing edge velocity profiles, large cylinders, Re=50,000, z∕P=0, (a)U∕Ue, (b)u′∕Ue

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Figure 9

Trailing edge velocity profiles, large cylinders, Re=50,000, z∕P=0.5, (a)U∕Ue, (b)u′∕Ue

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Figure 10

Trailing edge velocity profiles, large cylinders, Re=50,000, P∕D=30, (a)U∕Ue, (b)u′∕Ue

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Figure 11

Shape factor, H, at trailing edge, large cylinders, Re=50,000

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Figure 12

Trailing edge velocity profiles, large cylinders, Re=300,000, z∕P=0, (a)U∕Ue, (b)u′∕Ue

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Figure 13

Trailing edge velocity profiles, large cylinders, Re=300,000, z∕P=0.5, (a)U∕Ue, (b)u′∕Ue

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Figure 14

Trailing edge velocity profiles, large cylinders, Re=300,000, P∕D=30, (a)U∕Ue, (b)u′∕Ue

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Figure 15

Shape factor, H, at trailing edge, large cylinders, Re=300,000

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Figure 16

Momentum thickness at trailing edge, large cylinders, Re=300,000

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Figure 17

Trailing edge velocity profiles, small cylinders, Re=50,000, z∕P=0, (a)U∕Ue, (b)u′∕Ue

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Figure 18

Trailing edge velocity profiles, small cylinders, Re=300,000, z∕P=0, (a)U∕Ue, (b)u′∕Ue

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Figure 19

Shape factor, H, at trailing edge, small cylinders, Re=300,000

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Figure 20

Momentum thickness at trailing edge, small cylinders, Re=300,000

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