Supersonic jet noise and the high speed civil transportAn evaluation is made of the comparative advantages of prospective SST engine noise-suppression systems, with a view to their effectiveness in meeting the federally-mandated community noise standards of FAR 36 Stage III. A noise-suppression system must be capable of removing at least 4 EPNdB of noise percent thrust loss at takeoff. While none of the suppressors presently discussed is capable of meeting this goal, the inverted velocity profile/annular convergent-divergent plug/acoustically-treated ejector suppressor combination of configurational elements appears to represent the most efficient noise-control apparatus. Noncircular cross-section nozzle geometries also furnish a general noise reduction advantage over circular ones.
Document ID
19890059401
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Seiner, John M. (NASA Langley Research Center Hampton, VA, United States)
Krejsa, Eugene A. (NASA Lewis Research Center Cleveland, OH, United States)