The University of Southampton
University of Southampton Institutional Repository

Investigation of the sound generation mechanisms for in-duct orifice plates

Investigation of the sound generation mechanisms for in-duct orifice plates
Investigation of the sound generation mechanisms for in-duct orifice plates
Sound generation due to an orifice plate in a hard-walled flow duct which is commonly used in air distribution systems (ADS) and flow meters is investigated. The aim is to provide an understanding of this noise generation mechanism based on measurements of the source pressure distribution over the orifice plate. A simple model based on Curle's acoustic analogy is described that relates the broadband in-duct sound field to the surface pressure cross spectrum on both sides of the orifice plate. This work describes careful measurements of the surface pressure cross spectrum over the orifice plate from which the surface pressure distribution and correlation length is deduced. This information is then used to predict the radiated in-duct sound field. Agreement within 3 dB between the predicted and directly measured sound fields is obtained, providing direct confirmation that the surface pressure fluctuations acting over the orifice plates are the main noise sources. Based on the developed model, the contributions to the sound field from different radial locations of the orifice plate are calculated. The surface pressure is shown to follow a U3.9 velocity scaling law and the area over which the surface sources are correlated follows a U1.8 velocity scaling law.
0001-4966
561-572
Tao, Fuyang
bb4457f5-612b-4dbe-a664-ca1bb895213a
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Zhang, Xin
e551b9e6-0e46-4266-afc0-f5c81ae6ccb6
Stalnov, Oksana
6ca7508b-4d32-4e46-9158-ef8f03795ece
Siercke, Matthias
b935e5ae-615d-490e-aca9-9bc9ee440e98
Scheel, Henning
a830e8e1-a363-499e-8de0-b1eeda561187
Tao, Fuyang
bb4457f5-612b-4dbe-a664-ca1bb895213a
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Zhang, Xin
e551b9e6-0e46-4266-afc0-f5c81ae6ccb6
Stalnov, Oksana
6ca7508b-4d32-4e46-9158-ef8f03795ece
Siercke, Matthias
b935e5ae-615d-490e-aca9-9bc9ee440e98
Scheel, Henning
a830e8e1-a363-499e-8de0-b1eeda561187

Tao, Fuyang, Joseph, Phillip, Zhang, Xin, Stalnov, Oksana, Siercke, Matthias and Scheel, Henning (2017) Investigation of the sound generation mechanisms for in-duct orifice plates. Journal of the Acoustical Society of America, 142, 561-572. (doi:10.1121/1.4996459).

Record type: Article

Abstract

Sound generation due to an orifice plate in a hard-walled flow duct which is commonly used in air distribution systems (ADS) and flow meters is investigated. The aim is to provide an understanding of this noise generation mechanism based on measurements of the source pressure distribution over the orifice plate. A simple model based on Curle's acoustic analogy is described that relates the broadband in-duct sound field to the surface pressure cross spectrum on both sides of the orifice plate. This work describes careful measurements of the surface pressure cross spectrum over the orifice plate from which the surface pressure distribution and correlation length is deduced. This information is then used to predict the radiated in-duct sound field. Agreement within 3 dB between the predicted and directly measured sound fields is obtained, providing direct confirmation that the surface pressure fluctuations acting over the orifice plates are the main noise sources. Based on the developed model, the contributions to the sound field from different radial locations of the orifice plate are calculated. The surface pressure is shown to follow a U3.9 velocity scaling law and the area over which the surface sources are correlated follows a U1.8 velocity scaling law.

Text
SurfacePressure - Accepted Manuscript
Download (2MB)
Text
Untitled_12112018_122153 - Version of Record
Restricted to Repository staff only
Request a copy

More information

Accepted/In Press date: 15 July 2017
e-pub ahead of print date: 3 August 2017
Published date: 3 August 2017

Identifiers

Local EPrints ID: 426204
URI: http://eprints.soton.ac.uk/id/eprint/426204
ISSN: 0001-4966
PURE UUID: 3b4e8988-e663-4daf-bc2f-2205fc9fb30a

Catalogue record

Date deposited: 16 Nov 2018 17:30
Last modified: 06 Oct 2020 17:39

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×