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Noise suppressorA tuned noise suppressor is described consisting of annular acoustically porous elements for incorporation into the inlet and exhaust ducts of turbofan engines. The apparatus uses sound wave absorption, reflection, and incompatibility for achieving high noise reduction in the short distance. In addition, it has a duct of uniform inner diameter which does not block the duct flow.
Document ID
19740024305
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Zorumski, W. E. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
August 20, 1974
Subject Category
Communications
Report/Patent Number
Patent Application Number: US-PATENT-APPL-SN-359957
Patent Number: US-PATENT-3,830,335
Patent Number: NASA-CASE-LAR-11141-1
Accession Number
74N32418
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-3,830,335|NASA-CASE-LAR-11141-1
Patent Application
US-PATENT-APPL-SN-359957

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