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UID:0-403@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20180319T163000

DTEND;TZID=Asia/Jerusalem:20180319T173000

DTSTAMP:20230530T180414Z

URL:https://aerospace.technion.ac.il/events/approaches-for-the-monitoring-
 of-airfoil-aerodynamic-noise/

SUMMARY:Approaches for the Monitoring of Airfoil Aerodynamic Noise
DESCRIPTION:Lecturer:Michael Weidenfeld\n Faculty:Department of Aerospace E
 ngineering\n Institute:Technion – Israel Institute of Technology\n Locat
 ion:Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abs
 tract: \n Details: \n Airfoil noise is a dominant component in the acousti
 c signature of a wide variety of aerodynamic systems. In line with current
  interest in reducing aircraft noise\, the present work studies means by w
 hich airfoil aerodynamic sound may be monitored. The principal approach ad
 opted is motivated by biomimetic observations of the quiet flight of owls.
  Subsequently\, we investigate the effects of airfoil porosity\, elasticit
 y and non-homogeneity on the acoustic far field of a two-dimensional airfo
 il set at low Mach and high Reynolds number flow. Applying the Powell-Howe
  acoustic analogy\, the system near-field description is obtained using th
 in-airfoil methodology\, and then substituted as a source term in the vort
 ex sound equation. The leading order airfoil dipole-type signature is eval
 uated\, and conditions for sound reduction and amplification are found. Th
 e limit case of a thin airfoil having vanishing bending rigidity is examin
 ed in detail\, to rationalize the impact of material flexural stiffness on
  the system near and far fields.\nIn a secondary effort\, the broad-band a
 erodynamic noise of a NACA0012 airfoil is investigated using high-fidelity
  Large Eddy Simulations (LES). The obtained noise sources are projected to
  the far field using the Ffowcs Williams-Hawkings acoustic analogy. Both n
 ear- and far-field results are validated\, followed by preliminary investi
 gation of the effects of trailing-edge temperature variations on the syste
 m acoustic radiation.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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