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Acoustical methods for investigating turbocharger flow instabilities
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
2013 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 4, 2013-01-1879- p.Article in journal (Refereed) Published
Abstract [en]

In order to increase the internal combustion engine efficiency turbocharging is today widely used. The trend, in modern engine technology, is towards higher boost pressures while keeping the combustion pressure raise relatively small. The turbocharger surge occurs if the pressure at the outlet of the compressor is greater than it can maintain, i.e., a reverse flow will be induced. In presence of such flow conditions instabilities will occur which can couple to incident acoustic (pressure) waves and amplify them. The main objective of the present work is to propose a novel method for investigation of turbocharger flow instabilities or surge precursors. The method is based on the determination of the acoustic two-port data. The active part of this data describes the sound generation and the passive part the scattering of sound. The scattering data will contain information about flow-acoustic interaction and amplification of sound that could occur close to surge. Here the existence of such amplification will be investigated for a compressor operating at different operating points including points near the surge line. In addition the generated sound for reflection-free conditions is also investigated on both the up- and downstream side. All the measurements have been carried out in the unique CCGEx test rig for two-port testing of turbo-compressors.

Place, publisher, year, edition, pages
S A E Inc , 2013. Vol. 4, 2013-01-1879- p.
Keyword [en]
Acoustical methods, Combustion pressure, Engine technology, Flow instabilities, Flow-acoustic interaction, Operating points, Scattering data, Sound generation
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-134161DOI: 10.4271/2013-01-1879ScopusID: 2-s2.0-84881197402OAI: diva2:665573
SAE 2013 Noise and Vibration Conference and Exhibition, NVC 2013; Grand Rapids, MI; United States; 20 May 2013 through 23 May 2013

QC 20150623

Available from: 2013-11-20 Created: 2013-11-18 Last updated: 2015-06-23Bibliographically approved

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Kabral, RaimoÅbom, Mats
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Aeronautical and Vehicle EngineeringCompetence Center for Gas Exchange (CCGEx)Marcus Wallenberg Laboratory MWL
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