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Duct liner optimization for turbomachinery noise sources

Author
Posey, J. W.
Published
Nov 1, 1975.
Physical Description
1 electronic document
Additional Creators
Lester, H. C.
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
An acoustical field theory for axisymmetric, multisectioned lined ducts with uniform flow profiles was combined with a numerical minimization algorithm to predict optimal liner configurations having one, two, and three sections. Source models studied include a point source located on the axis of the duct and rotor/outlet-stator viscous wake interaction effects for a typical research compressor operating at an axial flow Mach number of about 0.4. For this latter source, optimal liners for equipartition-of energy, zero-phase, and least-attenuated-mode source variations were also calculated and compared with exact results. It is found that the potential benefits of liner segmentation for the attenuation of turbomachinery noise is greater than would be predicted from point source results. Furthermore, effective liner design requires precise knowledge of the circumferential and radial modal distributions.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19760004009.
Accession ID: 76N11097.
NASA-TM-X-72789.
Meeting of the Acoust. Soc. of Am.; 4-7 Nov. 1975; San Francisco, CA; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15738159