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Pulsatile Turbulent Flow in Straight and Curved Pipes - Interpretation and Decomposition of Hot-Wire Signals
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx). KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-8127-8124
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx). KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1663-3553
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx). KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1146-3241
2015 (English)In: Flow Turbulence and Combustion, ISSN 1386-6184, E-ISSN 1573-1987, Vol. 94, no 2, 305-321 p.Article in journal (Refereed) Published
Abstract [en]

Pulsatile turbulent flows in curved pipes at high Womersley and Reynolds numbers are prevalent in various components of internal combustion engines, in particular in the intake of the exhaust manifold. Despite their technological importance, there appears to be a lack of experimental data both with regard to straight and bent pipes. The present paper addresses this gap through phase-locked hot-wire anemometry measurements in a highly pulsatile turbulent flow through straight and bent pipes and compares the results with those obtained under steady flow conditions. The aim is to understand to some extent the effect of pulsations on the turbulent flow itself and for that purpose different decomposition methods are applied to the data in order to reveal the underlying turbulence from the pulsatile signal. Besides classical phase-averaging, also temporal filtering and singular value decomposition have been employed to investigate the decomposed turbulence statistics in terms of their pulsatile and turbulence contributions. Results show that-due to the large scale separation between the turbulence and pulsations-both decomposition techniques provide similar results and highlight, that the statistics from the turbulent part of the pulsatile flow resemble those of the steady one.

Place, publisher, year, edition, pages
Springer, 2015. Vol. 94, no 2, 305-321 p.
Keyword [en]
Turbulence, Pipe flow, Pulsatile flow, Curved pipe flow, Decomposition techniques
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-162945DOI: 10.1007/s10494-014-9571-3ISI: 000349853900002Scopus ID: 2-s2.0-84925461026OAI: oai:DiVA.org:kth-162945DiVA: diva2:800200
Funder
Swedish Energy Agency
Note

QC 20150402. QC 20160113

Available from: 2015-04-02 Created: 2015-03-26 Last updated: 2017-12-04Bibliographically approved

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Örlü, RamisAlfredsson, P. Henrik

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Kalpakli Vester, AthanasiaÖrlü, RamisAlfredsson, P. Henrik
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Competence Center for Gas Exchange (CCGEx)Linné Flow Center, FLOW
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Flow Turbulence and Combustion
Applied Mechanics

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