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TECHNICAL PAPERS

Effects of Surface Roughness and Turbulence Intensity on the Aerodynamic Losses Produced by the Suction Surface of a Simulated Turbine Airfoil

[+] Author and Article Information
Qiang Zhang, Phillip M. Ligrani

Convective Heat Transfer Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah 84112-9208 USA

Sang Woo Lee

School of Mechanical Engineering, Kumoh National Institute of Technology, Gumi, Gyongbook 730-701 Korea

J. Fluids Eng 126(2), 257-265 (May 03, 2004) (9 pages) doi:10.1115/1.1667886 History: Received May 06, 2003; Revised October 30, 2003; Online May 03, 2004
Copyright © 2004 by ASME
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References

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Figures

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Schematic diagram of the test section
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Schematic diagram of the test airfoil
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Airfoil Mach number distribution
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Three-dimensional Wyko profilometry traces of portions of the rough surfaces. (a) Simulated rough surface with small-sized roughness elements. (b) Rough surface from the trailing-edge pressure side of a turbine blade with particulate deposition from a utility power engine.
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Dependence of the ratio of equivalent sandgrain roughness size to mean roughness height on the Sigal and Danberg 4 roughness parameter for the present study, and the Schlichting 2, Coleman et al. 3, and the van Rij et al. 7 investigations
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Profiles measured with inlet turbulence intensity of 0.9%. (a) Normalized local total pressure losses. (b) Normalized local Mach numbers. (c) Normalized local kinetic energy.
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Profiles measured using the smooth airfoil (ks/c=0) with different turbulence intensity levels. (a) Normalized local total pressure losses. (b) Normalized local Mach numbers. (c) Normalized local kinetic energy.
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Profiles measured using the airfoil with large-sized roughness (ks/c=.00164) with different inlet turbulence intensity levels. (a) Normalized local total pressure losses. (b) Normalized local Mach numbers. (c) Normalized local kinetic energy.
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Comparison of dimensional Integrated Aerodynamic Loss as dependent upon the inlet turbulence intensity level for the smooth airfoil (ks/c=0), the airfoil with small roughness (ks/c=.00069), and the airfoil with large roughness (ks/c=.00164)
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Comparison of normalized Integrated Aerodynamic Loss as dependent upon the normalized equivalent sand grain roughness size for different inlet turbulence intensity levels
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Comparisons of total pressure loss coefficients with ones from Ames and Plesniak 20 for smooth airfoils (ks/c=0)

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