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TECHNICAL PAPERS

Aerodynamic-Rotordynamic Interaction in Axial Compression Systems—Part I: Modeling and Analysis of Fluid-Induced Forces

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

Consulting Services Department, Saudi Arabian Oil Company (Saudi Aramco), Dhahran 31311, Saudi Arabia

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), 405-415 (Aug 27, 2003) (11 pages) doi:10.1115/1.1576430 History: Received November 30, 2001; Online August 27, 2003
Copyright © 2003 by ASME
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References

Figures

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General features of the compressor pressure-rise characteristic
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A schematic of the control volume for one stage of the rotating assembly
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Velocity triangles and terminology used in evaluating force expressions
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Three-dimensional components of velocity triangle
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Pressure-rise and torque characteristics for the MIT 3-stage axial compressor. (Measured performance reported by Gamache 21 and others.)
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Calculated amplitude of turning force Ftu for different values of flow nonuniformity amplitude
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Calculated amplitude of pressure force Fpr for different values of flow nonuniformity amplitude
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Calculated amplitude of unsteady force Fun for different values of flow nonuniformity frequency
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Schematic of the phase relationship between the three aerodynamic forces and flow nonuniformity. Note that the flow nonuniformity, indicated by the large dot, is not in phase with the tip clearance asymmetry.
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Flow nonuniformity and aerodynamic forces for a fixed rotor offset of r=1.0% chord
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Measured and assumed pressure-rise characteristics for the GE LSRC
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Basic rotor-casing geometry (exaggerated proportions)
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Schematic of the compression system model
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Comparison between experiment, numerical results, and this model, for the GE LSRC compressor with r=1.0% chord

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