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UID:0-534@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20150413T163000

DTEND;TZID=Asia/Jerusalem:20150413T173000

DTSTAMP:20230603T193520Z

URL:https://aerospace.technion.ac.il/events/modelling-and-control-of-aeroa
 coustic-noise/

SUMMARY:Modelling and Control of Aeroacoustic Noise
DESCRIPTION:Lecturer:Dr. Oksana Stalnov\n Faculty:University of Southampton
 \, UK\n Institute:\n Location:Classroom 165\, ground floor\, Library\, Aer
 ospace Eng.\n Zoom: \n Abstract: \n Details: \n The reduction of aeroacous
 tic noise is a major engineering challenge that affects a wide range of in
 dustries from air transport to wind energy. For instance\, noise pollution
  for communities near airports is a major constraint on further growth of 
 air transport traffic. In particular\, when landing gears are being deploy
 ed during the approach phase of flight they become the main contributor to
  the airframe noise. Similarly\, the noise emitted from wind-turbine blade
 s is limiting further spread of onshore wind-farm due to public concern ab
 out noise pollution. The noise emitted from the blades is predominately ae
 rodynamic and is generated when a turbulent boundary layer interacts with 
 a trailing-edge of a blade. Reducing the noise level while maintaining aer
 odynamic performance is a challenge today and it is likely to be more impo
 rtant in the future.\nThis talk will focus on enhancing\, predicting and c
 ontrolling aeroacoustic performance. The first part of the talk will discu
 ss the noise generation associated with bluff bodies\, such as circular\, 
 and the application of flow control for noise reduction. Experiments were 
 performed in the University of Southampton’s open jet anechoic facility 
 and closed-loop aerodynamic wind-tunnel to investigate the effect of blowi
 ng circumferential angle and strength and found that noise can be reduced 
 when flow-control is applies under optimal conditions. The second part of 
 the talk will discuss further development of airfoil self-noise prediction
  model. This work extends previously published TNO-Blake semi-infinite bro
 adband airfoil self-noise model to incorporate finite chord noise radiatio
 n Amiet model with recent improvements in modelling of boundary-layer para
 meters. These results demonstrate that aerodynamic noise of NACA-0012 airf
 oil section can be predicted with less than 2dB while avoiding parameter t
 uning. Furthermore\, the TNO-Amiet model captures the measured oscillation
  in both far-field spectra and directivity patterns. The results of these 
 studies could be applied in the future to guide industry to improve both a
 erodynamic and aeroacoustic performance.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20150327T030000

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