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Air transportation is vital to our economic health and quality
of life, but that prosperity comes
at a price: noise pollution.
Many components of an aircraft contribute to noise pollution,
particularly the nozzles of jet engines.
The exhaust gases exiting the engine
through the nozzle are a significant source of noise,
particularly on takeoff.
Nozzles produce hot, high speed air that contributes to thrust.
This air interacts with the ambient air - cooler,
and traveling at a lower speed.
You can hear the result...
NASA has developed the computational tools
to first develop an understanding of noise,
its sources, and how it is created.
From this has come a new generation of engines,
designed with quiet in mind.
With the goal to keep noise inside the airport boundaries,
NASA research has produced a variety of technology solutions,
including seamless, acoustic duct liners to keep sound
from bouncing off seams inside the engine inlet,
And the use of asymmetrical chevrons, scalloped
or serrated edges, surrounding the engine core and exhaust.
Reducing fan speed and exit velocities
on nozzles will also reduce generated noise levels.
These NASA-inspired technology solutions are helping
to reduce the noise impact on communities abutting airports,
creating the new sound of progress tomorrow...