Unpublished conference/Abstract (Scientific congresses and symposiums)
Frequency halving due to vortex pairing for the jet-slot oscillator
Billon, Alexis; Glesser, Martin; Valeau, Vincent et al.
200613th International Congress on Sound and Vibration
 

Files


Full Text
Art_aero.pdf
Publisher postprint (565.59 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Aeroacoustics; Self-sustained tones; Vortex pairing
Abstract :
[en] At the outlet of the HVCA systems, whistling can occur, due to self-sustained oscillations. In this study, the ventilation outlet is modelled by a free plane subsonic jet impinging on a slotted plate, leading to self-sustained tones production; this configuration is known as the jet-slot oscillator. The tone's frequency can be predicted through the vortex dynamics within the flow. For jet velocities higher than 16m/s, the tones couple with the flow-supply-duct’s resonances. These resonances control the vortex dynamics and reinforce the sound production, of about 20dB. Moreover, when the distance from the jet exit to the plate is increased and reaches 4.5 times the jet height, the fundamental frequency of the tones is suddenly halved due to some vortex pairing occurring at the end of the potential core of the jet. In this paper, the vortex pairing is observed with three different experimental techniques. Firstly, comparison between the radiated and the in-duct acoustic fields is conducted. Then the energy transfer from the fundamental to the sub-harmonics of the shear layer's velocity fluctuations is observed with anemometric measurements. Finally high speed flow visualizations are performed and allow to link the vortex impingement on the plate to the sound production.
Disciplines :
Mechanical engineering
Author, co-author :
Billon, Alexis ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electroacoustique, acoustique appliquée et éclairage
Glesser, Martin
Valeau, Vincent
Sakout, Anas
Language :
English
Title :
Frequency halving due to vortex pairing for the jet-slot oscillator
Publication date :
July 2006
Event name :
13th International Congress on Sound and Vibration
Event place :
Vienna, Austria
Audience :
International
Available on ORBi :
since 21 February 2010

Statistics


Number of views
46 (0 by ULiège)
Number of downloads
315 (0 by ULiège)

Scopus citations®
 
0
Scopus citations®
without self-citations
0

Bibliography


Similar publications



Contact ORBi