The University of Dublin | Trinity College -- Ollscoil Átha Cliath | Coláiste na Tríonóide
Trinity's Access to Research Archive
Home :: Log In :: Submit :: Alerts ::

School of Engineering >
Mechanical & Manufacturing Eng >
Mechanical & Manufacturing Eng (Scholarly Publications) >

Please use this identifier to cite or link to this item:

Title: Shear Layer Dynamics of a Cylindrical Cavity for Different Acoustic Resonance Modes
Other Titles: 15th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Author's Homepage:
Keywords: Cylindrical Cavity
Acoustic Resonance Modes
Shear Layer
Issue Date: 2010
Citation: Gareth J. Bennett, Francisco Rodriguez Verdugo, David B. Stephens, Shear Layer Dynamics of a Cylindrical Cavity for Different Acoustic Resonance Modes, 15th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 5-8 July, 2010
Abstract: This paper investigates the interaction between the shear layer over a circular cavity and the flow-excited acoustic response of the volume to shear layer instability modes. Within the fluid-resonant category of cavity oscillation, most research has been carried out on rectangular geometries and where cylinders are considered, side branch and Helmholtz oscillators are most common. In these studies, focus is generally restricted to either longitudinal standing waves or to Helmholtz resonance. In practical situations however, where the cavity is subject to a range of flow speeds, many different resonant mode types may be excited. The current work presents a cylindrical cavity design where Helmholtz oscillation, longitudinal resonance and also azimuthal acoustic modes may all be excited upon varying the flow speed. Experiments performed show how lock-on between each of the three fluid-resonances and shear-layer instability modes can been generated. A circumferential array of microphones flush mounted with the internal surface of the cavity wall was used to decompose the acoustic pressure field into acoustic modes and has verified the excitation of higher order azimuthal modes by the shear layer. One of these interior pressure signals was also used to provide a phase signal for averaging flow field measurements of the shear layer acquired using PIV. Observation of the PIV images provides insight into these acoustically coupled oscillations.
Description: PUBLISHED
Lisbon, Portugal
Appears in Collections:Mechanical & Manufacturing Eng (Scholarly Publications)

Files in This Item:

File Description SizeFormat
Lisbon2010_Bennett_1727.pdf1.3 MBAdobe PDFView/Open

This item is protected by original copyright

Please note: There is a known bug in some browsers that causes an error when a user tries to view large pdf file within the browser window. If you receive the message "The file is damaged and could not be repaired", please try one of the solutions linked below based on the browser you are using.

Items in TARA are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback