Turbomachine discrete-frequency tones, a significant environmental concern, are generated by rotor-stator interactions. Specific spatial modes are generated, but not all generated modes propagate to the far field. It is the propagating spatial modes generated by rotor-stator that represent the community-disturbing far field discrete-frequency noise. Fundamental active airfoil source discrete-frequency noise control experiments are performed, with the active airfoil source control optimized to generate propagating spatial modes to cancel the propagating spatial modes generated by the rotor-stator interaction. These experiments demonstrate the viability and effectiveness of rotary-valve discrete-frequency noise control. Specifically, the active noise control system combines the active airfoil source control with in-duct spatial mode measurement. In this unique design, the active airfoils of the stator vane row are driven by a remote centerbody-mounted rotary-valve system. Propagating spatial mode reductions of 5 dB and 9 dB upstream and downstream with negligible modal spillover are demonstrated.
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ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
June 7–10, 1999
Indianapolis, Indiana, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7861-3
PROCEEDINGS PAPER
Active Control of Discrete-Frequency Turbomachinery Noise Using a Rotary-Valve Actuator
Scott D. Sawyer,
Scott D. Sawyer
University of Akron, Akron, OH
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Sanford Fleeter
Sanford Fleeter
Purdue University, West Lafayette, IN
Search for other works by this author on:
Scott D. Sawyer
University of Akron, Akron, OH
Sanford Fleeter
Purdue University, West Lafayette, IN
Paper No:
99-GT-403, V004T04A025; 9 pages
Published Online:
December 16, 2014
Citation
Sawyer, SD, & Fleeter, S. "Active Control of Discrete-Frequency Turbomachinery Noise Using a Rotary-Valve Actuator." Proceedings of the ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General. Indianapolis, Indiana, USA. June 7–10, 1999. V004T04A025. ASME. https://doi.org/10.1115/99-GT-403
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