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Experimental study on the forcing design for an intermittent injection
KTH, School of Engineering Sciences (SCI), Mechanics. Institute of Sound and Vibration Research (ISVR), University of Southampton, United Kingdom.ORCID iD: 0000-0002-8038-1127
Department of Energy Sciences, LTH Faculty of Engineering, Lund University.ORCID iD: 0000-0001-5736-3126
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9976-8316
KTH, School of Engineering Sciences (SCI), Mechanics.
2018 (English)In: Experiments in Fluids, ISSN 0723-4864, E-ISSN 1432-1114, Vol. 59, no 8, article id 123Article in journal (Refereed) Accepted
Abstract [en]

In this paper we consider the effects of acceleration and deceleration on the forcing of an intermittent jet. This experimental study specifically focuses on the effect of the acceleration and deceleration on the mixing of an intermittent jet with the ambient fluid and on the growth of disturbances that may lead to turbulence. The influence of different injection strategies has been evaluated. The results show that the deceleration phase may be able to contribute significantly to enhance the mixing of the jet with the ambient fluid. This effect is manifested primarily around the tail of the jet, towards the end of injection. The acceleration phase on the other hand has mainly impact at the leading part of the jet, where the leading part of the jet forms a mushroom shaped structure with minor mixing effect.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 59, no 8, article id 123
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-231138DOI: 10.1007/s00348-018-2574-4Scopus ID: 2-s2.0-85049526339OAI: oai:DiVA.org:kth-231138DiVA, id: diva2:1222759
Funder
Swedish Research Council
Note

QC 20180626

Available from: 2018-06-22 Created: 2018-06-22 Last updated: 2018-07-17Bibliographically approved

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Lacagnina, GiovanniWittberg, L. PrahlFuchs, Laszlo

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