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TECHNICAL PAPERS

Aerodynamic-Rotordynamic Interaction in Axial Compression Systems—Part II: Impact of Interaction on Overall System Stability

[+] Author and Article Information
Ammar A. Al-Nahwi

Abqaiq Plants, Saudi Arabian Oil Company (Saudi Aramco), Abqaiq, Saudi Arabia 31311

James D. Paduano

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

Samir A. Nayfeh

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Turbomach 125(3), 416-424 (Aug 27, 2003) (9 pages) doi:10.1115/1.1576431 History: Received November 30, 2001; Online August 27, 2003
Copyright © 2003 by ASME
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References

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Figures

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Aerodynamic-rotordynamic coupling mechanism
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Basic rotor-casing geometry (exaggerated proportions)
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Coupled system linear stability boundary in the Qe−χ parameter space for a centered rotor equilibrium, all parameters at nominal values
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Effect of rotor’s natural frequency (ν) on the coupled system linear stability boundary for a centered rotor equilibrium, all other parameters at nominal values
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Effect of compressor tip clearance sensitivity on linear stability boundary of the coupled system for a centered rotor equilibrium, three values of ψ, ν=0.2, all other parameters at nominal values
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Linear stability in the design parameter space: combining the two coupling parameters as ψχ, for compressor C2, all other parameters are at nominal values
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Linear stability in the design parameter space: compressor C2, for four different operating flow coefficients. All other parameters are at their nominal values
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Schematic depiction of stability boundaries on the compressor map
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Demonstration of how coupling alters post-instability behavior: response to initial conditions, ν=0.44 (25% of nominal), and B=1.0
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Bifurcation map comparing χ=0.0 and 0.5×10−3, with nominal ν=0.23, and low B=0.1

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