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Additional noise data on the SR-3 propellerThe noise generated by supersonic-tip-speed propellers is investigated. An eight bladed propeller was tested in the Lewis 8- by 6-foot wind tunnel with conditions providing data in the subsonic operating region of the propeller. These conditions resulted in a slight reshaping of the curve for blade passing tone as a function of helical tip Mach number as compared with previous results. Directivity curves with an additional transducer position gave an indication of a lobe pattern for this propeller that was not previously observed. The present data at the aft-most position indicate that some reflections, possibly from the test rig support strut, may have affected the data taken previously.
Document ID
19810017231
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Dittmar, J. H. (NASA Lewis Research Center Cleveland, OH, United States)
Jeracki, R. J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1981
Subject Category
Acoustics
Report/Patent Number
E-804
NASA-TM-81736
Accession Number
81N25767
Funding Number(s)
PROJECT: RTOP 535-03-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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