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Attenuation of upstream-generated low frequency noise by gas turbinesThe acoustic transfer functions of low frequency (below 3500 Hz) noise through aircraft turbines were investigated. Model test results were compared with theoretical predictions in order to assess the validity of the theory. Component tests were conducted on both high pressure and low pressure model turbines. The influence of inlet temperature and turbine speed attenuation was evaluated, while the effects of turbine pressure ratio, blade-row choking, and additional downstream stages were determined. Preliminary identification of pertinent aeroacoustic correlating parameters was made.
Document ID
19770021178
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Doyle, V. L. (General Electric Co. Evendale, OH, United States)
Matta, R. K. (General Electric Co. Evendale, OH, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1977
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
R77AEG482
NASA-CR-135219
Report Number: R77AEG482
Report Number: NASA-CR-135219
Accession Number
77N28122
Funding Number(s)
CONTRACT_GRANT: NAS3-19435
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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