An Experimental and Numerical Investigation into the Mechanisms of Rotating Instability

[+] Author and Article Information
Joachim März

STN Atlas Elektronik GmbH, Bremen 28305, Germany

Chunill Hah

NASA Glenn Research Center, Cleveland, OH 44135e-mail: chunhill.hah@grc.nasa.gov

Wolfgang Neise

DLR, Institute of Propulsion Technology, Berlin, Germany

J. Turbomach 124(3), 367-374 (Jul 10, 2002) (8 pages) doi:10.1115/1.1460915 History: Received February 12, 2001; Revised November 07, 2001; Online July 10, 2002
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Wall pressure spectrum with rotating instability components n=1400/min,BPF=560 Hz
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Fan characteristics at different tip clearances
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Position and layout of the access window
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Time-lapse plots of casing wall pressure at different tip clearances
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Ensemble averages and standard deviation plots for varying tip clearance and selected operating points
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Time history of blade pressure signal
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Sorting algorithm for double phase averaging
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Relative frame pressure field during one cycle of rotating instability
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Calculated time history of blade pressure
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Calculated standard deviation of pressure on casing
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Calculated instantaneous pressure field during one instability cycle
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Calculated instantaneous velocity vectors during one instability cycle
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Calculated instantaneous streamlines during one instability cycle
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Structure of instantaneous flow field
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Flow field near leading edge




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