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UID:0-529@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20150415T163000

DTEND;TZID=Asia/Jerusalem:20150415T173000

DTSTAMP:20230603T193351Z

URL:https://aerospace.technion.ac.il/events/effect-of-trailing-edge-elasti
 city-on-the-acoustic-signature-of-an-airfoil-in-unsteady-flow/

SUMMARY:Effect of Trailing Edge Elasticity on the Acoustic Signature of an 
 Airfoil in Unsteady Flow
DESCRIPTION:Lecturer:Vladimir Katz\n Faculty:Department of Aerospace Engine
 ering\n Institute:Technion – Israel Institute of Technology\n Location:C
 lassroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract
 : \n Details: \n Trailing edge noise is identified as a major component of
  airframe noise\, particularly during airplanes approach for landing\, whe
 n extensive use is made of high-lift devices. Consequently\, significant e
 fforts have been made to analyze the acoustic signature of such devices\, 
 in various setups and flight conditions. Common to almost all of these wor
 ks is a consideration of a rigid lift device\, in which the impacts of ele
 ment geometry and orientation are examined.\nThe objective of the present 
 work is to apply existing vibroacoustic methodologies to examine the effec
 t of trailing edge elasticity on the acoustic radiation of an otherwise ri
 gid airfoil. We consider the far-field radiation of a thin airfoil attache
 d to a flexible downstream appendage\, and compare it with radiation by a 
 counterpart rigid structure. Flow unsteadiness is modeled as an incident l
 ine vortex\, convected by the mean flow in the vicinity of the airfoil.\nA
 ssuming low-Mach high-Reynolds flight conditions\, the near-field flow is 
 examined based on thin-airfoil theory\, and the far-field sound is compute
 d using a compact-body acoustic analogy. Results describe the impact of tr
 ailing edge elasticity on near- and far-field flow characteristics\, and i
 ndicate on the amplifying  effect of edge flexibility on the far-field so
 und. In particular\, far-field radiation in the non-rigid case is affected
  by stronger edge-point interactions with incoming vorticity\, as well as 
 by long-time flow-induced oscillations at the system least stable eigenfre
 quency.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20150327T030000

TZOFFSETFROM:+0200

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