University of Hertfordshire

Sound radiation from the open end of pipes and ducts in the presence of mean flow

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Original languageEnglish
Title of host publicationProceedings of ACOUSTICS 2017 Perth
Subtitle of host publicationSound, Science and Society - 2017 Annual Conference of the Australian Acoustical Society, AAS 2017
EditorsTerrance McMinn, Alec Duncan
PublisherAustralian Acoustical Society
ISBN (Electronic)9780909882075
Publication statusPublished - 1 Jan 2017
EventACOUSTICS 2017 Perth: Sound, Science and Society - 2017 Annual Conference of the Australian Acoustical Society, AAS 2017 - Perth, Australia
Duration: 19 Nov 201722 Nov 2017

Publication series

NameProceedings of ACOUSTICS 2017 Perth: Sound, Science and Society - 2017 Annual Conference of the Australian Acoustical Society, AAS 2017

Conference

ConferenceACOUSTICS 2017 Perth: Sound, Science and Society - 2017 Annual Conference of the Australian Acoustical Society, AAS 2017
CountryAustralia
CityPerth
Period19/11/1722/11/17

Abstract

The radiation of sound from the open end of pipes and ducts is a common problem in environmental noise control. Examples include radiation from ductwork in heating, ventilation and air-conditioning systems, noise emissions from exhaust stacks in industrial power plants, as well as radiation from turbofan engines. These open duct terminations represent a relatively simple mechanical structure; however, the acoustics is significantly more complicated and this is especially true when a mean gas flow is present. This article presents an efficient numerical model suitable for analysing sound radiation from an unflanged duct termination, and introduces a method for including a uniform mean fluid flow in the exterior region away from the termination. An example of sound radiation from a turbofan engine is then investigated.

ID: 17630490