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Noise reduction from the redesign of a fan stage to minimize stator lift fluctuations

Author:
Woodward, R. P.
Published:
JAN 1, 1976.
Physical Description:
1 electronic document
Additional Creators:
Dittmar, J. H.
Online Version

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Summary:
An existing fan stage, redesigned to reduce stator lift fluctuations, was acoustically tested for reduced noise generation. The lift fluctuations on the stator were reduced by increasing the stator chord, adjusting incidence angles, and by adjusting the rotor velocity diagrams. The experiments showed significantly reduced broadband noise levels in the middle to high frequencies. Blade passage tone power was not reduced, but decreases in the harmonics were observed. Aerodynamic improvements in both performance and efficiency were obtained.
Other Subject(s):
Collection:
NASA Technical Reports Server (NTRS) Collection.
Note:
Document ID: 19760014118.
Accession ID: 76N21206.
E-8682.
NASA-TM-X-71896.
Aero-Acoustics Conf.; 20-23 Jul. 1976; Palo Alto, CA; United States.
Terms of Use and Reproduction:
No Copyright.
View MARC record | catkey: 15736418