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Aeroacoustic noise prediction of a wing with a droop-nose leading edge

: Adachi, Seiji; Brandstätt, Peter; Simpson, John

Becker, S. ; TU Darmstadt; Deutsche Gesellschaft für Akustik -DEGA-, Berlin:
Fortschritte der Akustik. DAGA 2015 : 41. Jahrestagung für Akustik, 16. - 19. März 2015, Nürnberg, DVD
Oldenburg: DEGA, 2015
ISBN: 978-3-939296-08-9
Deutsche Jahrestagung für Akustik (DAGA) <41, 2015, Nürnberg>
Conference Paper
Fraunhofer IBP ()

In the EU Clean Sky Green Regional Aircraft project, we are proposing a 3D wing model equipped with a gapless leading edge (LE) inclined downward, i.e., droop-nose, as a possible solution for reducing aeroacoustic noise. Based on the original wing for a geared turbofan aircraft, this model has been developed so that it has a droop-nose with a fixed angle of 15 degree over the almost entire span (18 to 98 percent of the span). In this research, noise radiated from the model has been predicted by a hybrid method. A stationary flow around the airfoil was first simulated in CFD analysis using a RANS turbulence model. After reconstructing a transient flow by an SNGR model, mid-field sound pressure was simulated based on Lighthill's acoustic analogy. Far-field pressure was finally computed by Kirchhoff-Helmholtz integral. The overall sound pressure level of this model was predicted to be 1.6 dB lower than that of the baseline model having no LE devices. It was also found that the transition between the droop-nose and the regular LE near the wing tip should be sharp for preventing flow separation in this region.