Realistic flow conditions of commercial and military aircraft engine exhausts are simulated in the anechoic environment of the Low Speed Aeroacoustics Wind Tunnel (LSAWT). Understanding jet noise generation processes, developing noise reduction techniques and investigating complex flow interactions are the focus of the research conducted in this unique facility.
An integral part of the Jet Noise Laboratory (JNL), the LSAWT has been instrumental in comprehensive studies of aeroacoustic improvement technologies for jet noise reduction in both subsonic and supersonic aircraft applications for many years and is particularly well suited for military clients. The test rig has been upgraded to provide enhanced capability in terms of increased temperatures and pressures. Some of the successes have included tests with the DoD, aircraft manufacturers, engine manufacturers and other industry partners.
Imbedded in the subsonic flow of the LSAWT is the single/dual flow Jet Engine Simulator (JES), which can simulate separate and mixed flow turbofan engine cycles over full throttle lines of both commercial and military aircraft. The JES provides independent control of both streams at temperatures up to 2000 ˚F. A series of combined diagnostic techniques in the LSAWT enhance the physical understanding of sound generation processes, flow fields, and acoustics. Test techniques include particle image velocimetry, linear and phased microphone arrays, and steady global pressures and temperatures.