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To learn more about the capabilities of the Aero-Acoustic Propulsion Laboratory and to find out if it can be used for your test, please, contact:

James Bridges

or see the
+ Aero-Acoustic Propulsion
   Laboratory Homepage

Testing Facilities
AAPL overhead microphone array

Arching overhead, the farfield microphone array of the Aero-Acoustic Propulsion Laboratory is used to measure sound produced by the nozzles tested in the Nozzle Acoustic Test rig.

A space to listen and learn
The Aero-Acoustic Propulsion Laboratory, (aka “The Dome”), has proven to be an ideal location for fan, nozzle, and engine noise tests.

What makes the Dome unique? Topping the list is the ability to vent the hot engine exhaust through the large door of the Dome without using noisy flow collectors. And since anechoic wedges are installed on all surfaces inside the 65 foot radius geodesic dome, far-field sound measurements aren’t contaminated by community noise or by reflections from lab equipment.

The Aero-Acoustic Propulsion Laboratory has access to continuous flow compressed air at 100 psi, 150 psi, and 450 psi, as well as to compressed gas trailers (typically natural gas and hydrogen). Couple these services with the state-of-the-art instrumentation we have, and it is hard to imagine a better place to solve complicated aircraft engine noise problems.

– Aero-Acoustic Propulsion Laboratory
+ Small Hot Jet Acoustic
   Test Rig

+ Nozzle Acoustic Test Rig
+ Advanced Noise Control
   Fan Rig

+ 9’x15’ Low Speed Wind Tunnel
+ Acoustical Testing Laboratory
+ Particle Image Velocimetry
+ Rotating Microphone Rake
+ Linear Microphone Array
+ Phased Array Microphones
+ Rayleigh Scattering
+ Hotwire, Hotfilm, and Laser    Doppler Velocimetry

Read more about other experiments conducted in the Aero-Acoustics Propulsion Laboratory.

+ Quiet enough to hear an engine
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NASA Official: Paula J. Dempsey, Ph.D.

Last Updated: March 22, 2019

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