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Comparison of inlet suppressor data with approximate theory based on cutoff ratioThis paper represents the initial quantitative comparison of inlet suppressor far-field directivity suppression with that predicted using an approximate liner design and evaluation method based upon mode cutoff ratio. The experimental data was obtained using a series of cylindrical point-reacting inlet liners on an Avco-Lycoming YF102 engine. The theoretical prediction program is based upon simplified sound propagation concepts derived from exact calculations. These indicate that all of the controlling phenomenon can be approximately correlated with mode cutoff ratio which itself is intimately related to the angles of propagation within the duct. The objective of the theory-data comparisons is to point out possible deficiencies in the approximate theory which may be corrected. After all theoretical refinements have been made, then empirical corrections can be applied.
Document ID
19800036794
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rice, E. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Heidelberg, L. J.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1980
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 80-0100
Meeting Information
Meeting: Aerospace Sciences Meeting
Location: Pasadena, CA
Start Date: January 14, 1980
End Date: January 16, 1980
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
80A20964
Distribution Limits
Public
Copyright
Other

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