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TECHNICAL PAPERS: Gas Turbines: Controls and Diagnostics

Active Control of Discrete-Frequency Turbomachinery Noise Using a Rotary-Valve Actuator

[+] Author and Article Information
Scott D. Sawyer

Department of Mechanical Engineering, University of Akron, Akron, OH 44323

Sanford Fleeter

Department of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Eng. Gas Turbines Power 122(2), 226-232 (Jan 03, 2000) (7 pages) doi:10.1115/1.483199 History: Received March 09, 1999; Revised January 03, 2000
Copyright © 2000 by ASME
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References

Figures

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Turbomachine noise sources
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Purdue annular cascade facility
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Vane to vane phase shift of acoustic pressure and active control voltage
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Active control of kg=−2 mode in the downstream duct
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Pressure pulse generator rotary-valve assembly schematic
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Rotating disk and active airfoil ports
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Rotary-valve outlet port open area at an instant in time
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Active control authority spatial mode magnitude as a function of rotary-valve flow rate
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Two vane rotary-valve discrete-frequency noise generation
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Spatial mode magnitude as a function of rotary-valve air supply
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Influence of valve phase angle on spatial mode magnitude
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Influence of valve phase angle on spatial mode magnitude
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Upstream control using rotary-valve active noise control system

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