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Variably positioned guide vanes for aerodynamic chokingA choking device to cause a sonic barrier to be formed which reduces the transmission of noise in a direction opposed to the direction of air flow in a compressor that may be part of an aircraft gas turbine engine is described. The noise reduction is accomplished by proper shaping and movement of inlet guide vanes, and an actuator is connected to selected guide vanes to effect movement by programmed amounts as required to choke or partially choke within the design range of the axial-flow-air compressor.
Document ID
19740023157
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Chestnutt, D. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
August 13, 1974
Subject Category
Communications
Report/Patent Number
Patent Number: US-PATENT-3,829,237
Patent Application Number: US-PATENT-APPL-SN-266820
Patent Number: NASA-CASE-LAR-10642-1
Accession Number
74N31270
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-3,829,237|NASA-CASE-LAR-10642-1
Patent Application
US-PATENT-APPL-SN-266820

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