Analysis of Aerodynamically Induced Whirling Forces in Axial Flow Compressors

[+] Author and Article Information
Z. S. Spakovszky

Gas Turbine Laboratory, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Turbomach 122(4), 761-768 (Feb 01, 2000) (8 pages) doi:10.1115/1.1312801 History: Received February 01, 2000
Copyright © 2000 by ASME
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Compressor performance prediction for a steady shaft offset of Δε=0.7 percent in the four repeating stage compressor reported in 5
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Unsteady momentum control volume analysis locked to rotor frame
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Definition of reference frames: rotor frame (x,y), rotating asymmetry frame (x,y), and absolute frame (x̃,ỹ)
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Alford β parameter for four stage compressor reported in 5 and model prediction
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Simplified blade loading analysis for compressors and turbines
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Simplified whirl analysis of four-stage compressor
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Spool loading parameter βspool for four repeating stage compressor reported in 5
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Compressor flow field with inertia effects included (solid) and inertia effects neglected (dashed) for a given tip-clearance distribution δε (dotted)
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Effect of flow inertia on rotor forces due to spool pressure loading
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Alford β parameter and spool loading parameter βspool for forced rotor whirl
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Magnitude and phase of fundamental wave form of flow coefficient (solid) and nondimensional spool pressure (dashed) for ϕ=0.391




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