Impact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems

The response of the combustor’s liner to the air-flow that passes through it is the key reason for the combustion chambers noise, hence the instabilities of those chambers that decreases the mechanical efficiency of such sections, by increased its mechanical vibrations, which increases the failure...

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Autores principales:	Wisam S. Hacham, Faisal S. Hiji
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2020
Materias:	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/a0b352fe24e847cf97cc8c1be1a28694
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spelling	oai:doaj.org-article:a0b352fe24e847cf97cc8c1be1a286942021-12-02T16:06:03ZImpact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems10.22153/kej.2020.10.0021818-11712312-0789https://doaj.org/article/a0b352fe24e847cf97cc8c1be1a286942020-12-01T00:00:00Zhttps://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/714https://doaj.org/toc/1818-1171https://doaj.org/toc/2312-0789 The response of the combustor’s liner to the air-flow that passes through it is the key reason for the combustion chambers noise, hence the instabilities of those chambers that decreases the mechanical efficiency of such sections, by increased its mechanical vibrations, which increases the failure rate created during originating of the cracks spreading by the shakes producing by the series of high-level frequencies. Accordingly, any work debating the impact of the context of liners in the combustion chamber can provide grasping for the combustion noise generated by the undesirable vibrations, and benefits the industrial firms to design an ideal production procedure which increases the lifespan of the combustor. The goal of this work is to examine the influence of the acoustic treatment using a double layers cylindrical perforated liner on the acoustic transmission loss of gas turbines. The liners layout influences on this acoustic parameter was examined using an experimental data gained by the insertion of a full scale single and double patterns of perforated liners into the unique large scale acoustic wind tunnel at the acoustic research center at Hull University. The experimental tests under-designed acoustic signals were established firstly using 0m/s air cross-flow velocity, then by changed velocities with interval 5m/s ranging between 10m/s to 25m/s. MATLAB script was used to simulate, analyze, and figure out the data collected the insertion of single and double layer patterns of the perforated liner. The experiments demonstrated that, if the perforation acoustic treatments are applied, the acoustic transmission loss will decrease, particularly obvious at higher level frequencies. Further, the results exposed that the air tunnel with the insertion of the liner with double layers reveals an improved perforation acoustic treatment. Wisam S. HachamFaisal S. HijiAl-Khwarizmi College of Engineering – University of BaghdadarticleChemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 16, Iss 4 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Wisam S. Hacham Faisal S. Hiji Impact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems
description	The response of the combustor’s liner to the air-flow that passes through it is the key reason for the combustion chambers noise, hence the instabilities of those chambers that decreases the mechanical efficiency of such sections, by increased its mechanical vibrations, which increases the failure rate created during originating of the cracks spreading by the shakes producing by the series of high-level frequencies. Accordingly, any work debating the impact of the context of liners in the combustion chamber can provide grasping for the combustion noise generated by the undesirable vibrations, and benefits the industrial firms to design an ideal production procedure which increases the lifespan of the combustor. The goal of this work is to examine the influence of the acoustic treatment using a double layers cylindrical perforated liner on the acoustic transmission loss of gas turbines. The liners layout influences on this acoustic parameter was examined using an experimental data gained by the insertion of a full scale single and double patterns of perforated liners into the unique large scale acoustic wind tunnel at the acoustic research center at Hull University. The experimental tests under-designed acoustic signals were established firstly using 0m/s air cross-flow velocity, then by changed velocities with interval 5m/s ranging between 10m/s to 25m/s. MATLAB script was used to simulate, analyze, and figure out the data collected the insertion of single and double layer patterns of the perforated liner. The experiments demonstrated that, if the perforation acoustic treatments are applied, the acoustic transmission loss will decrease, particularly obvious at higher level frequencies. Further, the results exposed that the air tunnel with the insertion of the liner with double layers reveals an improved perforation acoustic treatment.
format	article
author	Wisam S. Hacham Faisal S. Hiji
author_facet	Wisam S. Hacham Faisal S. Hiji
author_sort	Wisam S. Hacham
title	Impact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems
title_short	Impact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems
title_full	Impact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems
title_fullStr	Impact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems
title_full_unstemmed	Impact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems
title_sort	impact of using double layers perforated liners on the acoustic treatments of the combustor systems
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2020
url	https://doaj.org/article/a0b352fe24e847cf97cc8c1be1a28694
work_keys_str_mv	AT wisamshacham impactofusingdoublelayersperforatedlinersontheacoustictreatmentsofthecombustorsystems AT faisalshiji impactofusingdoublelayersperforatedlinersontheacoustictreatmentsofthecombustorsystems
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Impact of using Double Layers Perforated Liners on the Acoustic Treatments of the Combustor Systems

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