Tip Clearance Effects in a Turbine Rotor: Part I—Pressure Field and Loss

[+] Author and Article Information
Xinwen Xiao, Andrew A. McCarter, Budugur Lakshminarayana

Center for Gas Turbines and Power, Pennsylvania State University, 153-J Hammond Bldg., University Park, PA 16802

J. Turbomach 123(2), 296-304 (Feb 01, 2000) (9 pages) doi:10.1115/1.1368365 History: Received February 01, 2000
Copyright © 2001 by ASME
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Schematic of facility test section and measurement positions. 0 tip gap height: 0.76% chord at tip; 1 static pressure measurement on suction and pressure surfaces; 2 static pressure measurement at the corner of the blade tip; 3 transient pressure measurement on the casing wall from leading edge (X=0) to trailing edge (X=1) using kulite; 4 pressure measurement within the passage at X=0.7, 0.8, 0.9, and 1.1 using rotating five-hole Pitol probe and LDV.
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Inlet properties: C̄pt,ζ̄1,V̄x/Um,V̄θ/Um,ᾱ
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Blade pressure coefficient (Cp) comparison
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Static pressure distribution (Cp) on blade surfaces, including corresponding casing wall
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Static pressure coefficient (Cp) inside rotor passage
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Cp distribution on blade tip
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Static pressure coefficient Cp on casing wall
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Tangential force coefficient (CFy) along blade height
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Pressure coefficients on the casing wall (at the corresponding positions to the pressure surface and suction surface)
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Development of total pressure drop coefficient (Cpt)
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Development of total pressure loss coefficient (ζ)
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Area integrated mass averaged loss coefficient



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