Suppression of Flow-Excited Acoustic Resonance in Rectangular Cavities Using Spanwise High Frequency Vortex Generators

9th Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise

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Title Suppression of Flow-Excited Acoustic Resonance in Rectangular Cavities Using Spanwise High Frequency Vortex Generators
 
Creator Moamen Abdelmwgoud; University of Ontario Institute of Technology
Atef Mohany; University of Ontario Institute of Technology
 
Subject Cavity; Acoustic Resonance; Passive control;
 
Description The effectiveness of spanwise high frequency vortex generators in suppressing the acoustic resonance in flow over ducted rectangular cavities is experimentally investigated. Acoustic pressure measurements are performed where it is found that placing a circular rod upstream of the cavity edge can reduce the generated acoustic pressure significantly. By studying the flow structures in the region over the cavity, effective rod configurations can be identified and the effectiveness of this suppression method can be enhanced. Accordingly, hotwire measurements have been performed to understand the interaction mechanism between the shear layer developed over the cavity mouth and the vortex shedding generated by the rod. The velocity distribution along the cavity mid-plane when no rod is placed and when the rod is placed at different locations relative to the cavity upstream edge are discussed. It was found that the most effective rod locations mainly depend on the rod axis location with respect to the upstream edge as well as the vertical gap between the duct wall and the rod.
 
Publisher Paper Management System for FIV2018
 
Contributor
 
Date 2018-05-04 03:42:00
 
Type Peer-reviewed Paper

 
Format application/pdf
 
Identifier http://www.fiv2018.com/ocs/index.php/fiv2018/fivcan/paper/view/162
 
Source Paper Management System for FIV2018; FIV2018 Conference
 
Language en
 
Rights Authors who submit to this conference agree to the following terms:<br /> <strong>a)</strong> Authors retain copyright over their work, while allowing the conference to place this unpublished work under a <a href="http://creativecommons.org/licenses/by/3.0/">Creative Commons Attribution License</a>, which allows others to freely access, use, and share the work, with an acknowledgement of the work's authorship and its initial presentation at this conference.<br /> <strong>b)</strong> Authors are able to waive the terms of the CC license and enter into separate, additional contractual arrangements for the non-exclusive distribution and subsequent publication of this work (e.g., publish a revised version in a journal, post it to an institutional repository or publish it in a book), with an acknowledgement of its initial presentation at this conference.<br /> <strong>c)</strong> In addition, authors are encouraged to post and share their work online (e.g., in institutional repositories or on their website) at any point before and after the conference.
 

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