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Turbofans Turn Down the Volume
Anyone who has ever been within 100 yards of a powered-up commercial jet
aircraft knows that engine noise is part of the package. A significant
source of that noise is the part of the engine that produces its primary
thrust—the bypass section fan. Reducing the noise generated by that
turbofan would help reduce overall engine noise, and make a significant
contribution to NASA's goal to demonstrate a ten-decibel (10dB)
reduction in effective perceived aircraft noise levels by 2005 (compared
to 1997 engine levels).
By deploying a new geometrical technique that changed the turbofan's
exit nozzle area, NASA was able to demonstrate a reduction in noise
level with little change to the engine's size, weight or performance.
The increased turbofan efficiency produced an additional benefit—a
reduction in fuel burn that led to a reduction in nitrous oxide and
carbon dioxide emissions.
Turbofan Engine Noise Reduction Team
NASA Glenn Research Center
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