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

Kirby, R; Duan, W

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

Kirby, R

Duan, W

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Publication Type:: Conference Proceeding
Citation:: Proceedings of ACOUSTICS 2017 Perth: Sound, Science and Society - 2017 Annual Conference of the Australian Acoustical Society, AAS 2017, 2017
Issue Date:: 2017-01-01

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Field	Value	Language
dc.contributor.author	Kirby, R https://orcid.org/0000-0002-3520-1377	en_US
dc.contributor.author	Duan, W	en_US
dc.date.issued	2017-01-01	en_US
dc.identifier.citation	Proceedings of ACOUSTICS 2017 Perth: Sound, Science and Society - 2017 Annual Conference of the Australian Acoustical Society, AAS 2017, 2017	en_US
dc.identifier.isbn	9780909882075	en_US
dc.identifier.uri	http://hdl.handle.net/10453/126344
dc.description.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.	en_US
dc.relation.ispartof	Proceedings of ACOUSTICS 2017 Perth: Sound, Science and Society - 2017 Annual Conference of the Australian Acoustical Society, AAS 2017	en_US
dc.title	Sound radiation from the open end of pipes and ducts in the presence of mean flow	en_US
dc.type	Conference Proceeding
utslib.for	091301 Acoustics and Noise Control (excl. Architectural Acoustics)	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US

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.

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http://hdl.handle.net/10453/126344