Analysis of Aerodynamically Induced Whirling Forces in Axial Flow Compressors
Name
Spakovszky_Analysis of.pdf
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215.34 KB
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Author(s)
Spakovszky, Zoltan S
Date Issued
May 2000
Journal
ASME Turbo Expo 2000: Power for Land, Sea, and Air
Publisher
ASME International
Citation
Spakovszky, Z. S. “Analysis of Aerodynamically Induced Whirling Forces in Axial Flow Compressors.” ASME, 2000. V004T03A060.
Version
Author's final manuscript
Abstract
A new analytical model to predict the aerodynamic forces in axial flow compressors due to asymmetric tip-clearance is introduced. The model captures the effects of tip-clearance induced distortion (i.e. forced shaft whirl), unsteady momentum-induced tangential blade forces and pressure induced forces on the spool. Pressure forces are shown to lag the tip-clearance asymmetry, resulting in a tangential (i.e. whirl-inducing) force due to spool pressure. This force can be of comparable magnitude to the classical Alford force. Prediction and elucidation of the Alford force is also presented. In particular, a new parameter denoted as the blade loading indicator is deduced. This parameter depends only on stage geometry and mean flow and determines the direction of whirl tendency due to tangential blade loading forces in both compressors and turbines. All findings are suitable for incorporation into an overall dynamic system analysis and integration into existing engine design tools.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1115/2000-GT-0418
