Multiple pure tone noise generation and control.The generation of multiple pure tones in supersonic fans is discussed. The theoretical results of Kurasaka are reviewed and compared with experimental data obtained on a 36-in. diameter, 1550 ft/sec, 1.6 pressure ratio fan. Detailed measurements on bow shock locations taken with pressure transducers indicate that blade to blade discrepancies are the source of MPT generation. The paper presents some experimental results on an attempt to reduce the shock strength, and subsequently the MPT's, through blade modifications. Other attempts at reducing the MPT's through wall treatment, high inlet flow Mach number, acoustically treated splitters - are discussed. Experimental data is presented on the validity of these noise reduction methods.
Document ID
19730060051
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Benzakein, M. J.
Kazin, S. B.
Savell, C. T. (General Electric Co. Evendale, Ohio, United States)
Date Acquired
August 7, 2013
Publication Date
October 1, 1973
Subject Category
Propulsion Systems
Report/Patent Number
AIAA PAPER 73-1021
Meeting Information
Meeting: Aero-Acoustics Conference
Location: Seattle, WA
Start Date: October 15, 1973
End Date: October 17, 1973
Sponsors: American Institute of Aeronautics and Astronautics