University of California,
Sponsorhip: The Boeing Co.
As part of our comprehensive noise assessment, we are taking a fresh look at the phenomenon of jet-by-jet diffraction, namely how one jet plume scatters sound generated by another. A theoretical/computational approach has produced results that agree well with experimental measurements done in the 1980s. The predictions indicate that the jet is a significant scatterer of sound, almost as powerful as replacing the plume with a solid surface.
The goal is to integrate jet-by-jet diffraction into the next-generation aircraft noise prediction tools developed by NASA.
Papamoschou, D. , "Modeling of Jet-by-Jet Diffraction," AIAA-2013-0614 , 51st AIAA Aerospace Sciences Meeting, Grapevine, TX, Jan. 7-10, 2013. (PDF)
UNIVERSITY OF CALIFORNIA, IRVINE
JET AEROACOUSTICS LABORATORY
SUBSCALE SIMULATION OF GEARED TURBOFAN
Project sponsored by The Boeing Co.
GTF on outside test stand
Movie of inital RPM test (AVI, 16 Mb). Sensor indicated 58,000 RPM.
|Fan rotor (70-mm diameter)
Back to homepage