PMID- 34470318
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20210902
IS  - 1520-8524 (Electronic)
IS  - 0001-4966 (Linking)
VI  - 150
IP  - 2
DP  - 2021 Aug
TI  - A history of jet noise research at the National Aeronautics and Space 
      Administration.
PG  - 1346
LID - 10.1121/10.0005891 [doi]
AB  - This paper reviews jet noise research conducted at the National Aeronautics and 
      Space Administration (NASA) from the early 1950s to the present day. Research 
      conducted by NASA's predecessor, the National Advisory Committee for Aeronautics 
      (NACA), and during the early years of NASA focused on turbojet noise, where a 
      common approach for reducing jet noise was to limit the jet exit velocity to 
      speeds that provided acceptable noise levels. Suppressors tested during this time 
      resulted in thrust losses that were too severe to be implemented. With the 
      introduction of turbofan engines in the 1960s, NASA shifted research to programs 
      for both subsonic and supersonic aircraft applications with specific noise 
      reduction goals. Subsonic research focused on increasing the bypass ratio of the 
      engine to reduce the jet exit velocity of the core exhaust and adding mixers to 
      the dual exhaust streams. Advances in computational methods improved aerodynamic 
      designs and jet noise prediction tools. Supersonic applications proved to be more 
      troublesome as programs aimed at large commercial transports required higher 
      specific thrust engines. Changing the engine cycle to reduce jet noise was not 
      compatible with mission range and speed requirements. Research for supersonic 
      commercial aircraft remains an area of interest today at NASA.
FAU - Henderson, Brenda S
AU  - Henderson BS
AD  - NASA Glenn Research Center, MS 54-3, Cleveland, Ohio 44135, USA.
FAU - Huff, Dennis L
AU  - Huff DL
AD  - NASA Glenn Research Center, MS 54-3, Cleveland, Ohio 44135, USA.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Acoust Soc Am
JT  - The Journal of the Acoustical Society of America
JID - 7503051
SB  - IM
EDAT- 2021/09/03 06:00
MHDA- 2021/09/03 06:01
CRDT- 2021/09/02 05:34
PHST- 2021/09/02 05:34 [entrez]
PHST- 2021/09/03 06:00 [pubmed]
PHST- 2021/09/03 06:01 [medline]
AID - 10.1121/10.0005891 [doi]
PST - ppublish
SO  - J Acoust Soc Am. 2021 Aug;150(2):1346. doi: 10.1121/10.0005891.