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Flow characteristics of large industrial silencers
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis treats the flow through a new type of industrial silencer. The silencer is self-cleaning and therefore has a great advantage when the exhaust is contaminated with some species that would make other types of silencers (for example baffle dampers) loose performance. The self-cleaning mechanism is achieved by creating an under pressure inside the main flow and thereby get a suction of clean air through a perforated plate. The plate separates the main flow from the surrounding noise reducing material. The main purpose of this work is to find a dimensional criterion that would make the self-cleaning mechanism work in different geometries and flow conditions. Also an important thing is to keep the flowlosses at a minimum. In order to achieve this measurements and observations has been made on a laboratory fan equipped with a perforated outlet. Also, measurements and modifications have been made on silencers mounted at StoraEnsos paper mills in Kaukopää and Tainionkoski, outside the town Imatra in Finland. The silencers and the laboratory experiments have been investigated with CFD (Computational Fluid Dynamics). The results are guidelines to achieve a good self-cleaning mechanism. Suggestions that would give a more uniform flow and less loss are also given.

Place, publisher, year, edition, pages
Keyword [en]
Technology, CFD, Silencers, Perforated, Airflow
Keyword [sv]
URN: urn:nbn:se:ltu:diva-58315ISRN: LTU-EX--03/045--SELocal ID: ee5974e0-d75f-4c3b-954d-f5a037e305ddOAI: diva2:1031703
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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