University of California,
AEROACOUSTICS OF PROPULSION-AIRFRAME INTEGRATION
Sponsorhip: Boeing, NASA Langley Research Center
Careful integration of the engines with the airframe offers the potential for very quiet airplanes that will meet NASA's aggressive noise reduction goals.
A joint experimental/theoretical/computational effort addresses modeling of propulsion noise sources and prediction of their diffraction from the aircraft surfaces. The goal is development of engineering predictive tools that will guide the design of next-generation aircraft. On the experimental side, tests are being conducted in UCI's aeroacoustic facilities using scaled models representing accurately the engine exhaust and the outline of the airframe that diffracts sound. Theoretical efforts are based on wavepacket models for the jet noise source and computation of the resulting diffraction using the Boundary Element Method (BEM) and NASA's Fast Scattering Code (FSC).
Past efforts have focused on jet noise (the noise generated by the turbulent exhaust of the engine). Recently, our efforts have expanded to include open rotors and ducted fans.
Mayoral, S. and Papamoschou, D., Effects of Source Redistribution on Jet Noise Shielding," AIAA-2010-0652, 48th AIAA Aerospace Sciences Meeting and Exhibit, Jan.4-7, 2010, Orlando, FL. (PDF)
Papamoschou, D., Prediction of Jet Noise Shielding," AIAA-2010-0653, 48th AIAA Aerospace Sciences Meeting and Exhibit, Jan.4-7, 2010, Orlando, FL. (PDF)
Papamoschou, D. and Mayoral, S., Jet Noise Shielding for Advanced Hybrid Wing-Body Configuration ," AIAA-2011-0912, 49th AIAA Aerospace Sciences Meeting and Exhibit, Jan.4-7, 2011, Orlando, FL. (PDF)
Mayoral, S. and Papamoschou, D. , "Prediction of Jet Noise Shielding with Forward Flight Effects," AIAA-2013-0010 , 51st AIAA Aerospace Sciences Meeting, Grapevine, TX, Jan. 7-10, 2013. (PDF)
Papamoschou, D. and Mayoral, S., "Modeling of Jet Noise Sources and their Diffraction with Uniform Flow," AIAA-2013-0326 , 51st AIAA Aerospace Sciences Meeting, Grapevine, TX, Jan. 7-10, 2013. (PDF)
The hybrid-wing-body (HWB) planform and engine placement allow for significant potential for shielding of propulsion noise sources.
Model-scale experiments at UCI use a BPR=10 nozzle and the HWB planform to study jet noise shielding.
Prediction of noise scattering from HWB using the Fast Scattering Code.
Prediction of noise scattering from HWB using the Boundary Element Method.
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