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Article: Dynamics of interaction modes in excited annular jets

TitleDynamics of interaction modes in excited annular jets
Authors
Issue Date1998
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/etfs
Citation
Experimental Thermal and Fluid Science, 1998, v. 17 n. 4, p. 319-338 How to Cite?
AbstractEvolution of coherent structures and their interaction dynamics are educed in the near field of an acoustically excited basic unnular jet using conditional sampling technique based on a multiple triggering criterion to detect the two dominating modes of structure pattern. Acoustic excitation is applied with an aim to better organize the phase alignment of initial rolling and pairing process in the outer shear layer. Negligible modification of the time-averaged flow field results from the excitation. The educed coherent vorticities show that the two modes of evolution are due to the corresponding two modes of shedding pattern of the wake structures from the centerbody, namely the mode one wake and the mode zero wake. In both modes, the shear-layer mode jet vortex rings in the outer layer are perturbed by the shedding of wake structures in the inner region and interaction involving primary merging of three successive jet vortex rings or their partial circumferential sections is found. This results in the formation of wake-induced structures of the corresponding mode pattern, which possesses concentration of coherent vorticity and fluid circulation over a large spatial extent at 1 < x/D >2. Secondary interactions, such as vortex tearing, are also observed. | Evolution of coherent structures and their interaction dynamics are educed in the near field of an acoustically excited basic annular jet using conditional sampling technique based on a multiple triggering criterion to detect the two dominating modes of structure pattern. Acoustic excitation is applied with an aim to better organize the phase alignment of initial rolling and pairing process in the outer shear layer. Negligible modification of the time-averaged flow field results from the excitation. The educed coherent vorticities show that the two modes of evolution are due to the corresponding two modes of shedding pattern of the wake structures from the centerbody, namely the mode one wake and the mode zero wake. In both modes, the shear-layer mode jet vortex rings in the outer layer are perturbed by the shedding of wake structures in the inner region and interaction involving primary merging of three successive jet vortex rings or their partial circumferential sections is found. This results in the formation of wake-induced structures of the corresponding mode pattern, which possesses concentration of coherent vorticity and fluid circulation over a large spatial extent at 1
Persistent Identifierhttp://hdl.handle.net/10722/150109
ISSN
2015 Impact Factor: 2.128
2015 SCImago Journal Rankings: 1.389
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorKo, NWMen_US
dc.contributor.authorLau, KKen_US
dc.contributor.authorLam, KMen_US
dc.date.accessioned2012-06-26T06:01:36Z-
dc.date.available2012-06-26T06:01:36Z-
dc.date.issued1998en_US
dc.identifier.citationExperimental Thermal and Fluid Science, 1998, v. 17 n. 4, p. 319-338en_US
dc.identifier.issn0894-1777en_US
dc.identifier.urihttp://hdl.handle.net/10722/150109-
dc.description.abstractEvolution of coherent structures and their interaction dynamics are educed in the near field of an acoustically excited basic unnular jet using conditional sampling technique based on a multiple triggering criterion to detect the two dominating modes of structure pattern. Acoustic excitation is applied with an aim to better organize the phase alignment of initial rolling and pairing process in the outer shear layer. Negligible modification of the time-averaged flow field results from the excitation. The educed coherent vorticities show that the two modes of evolution are due to the corresponding two modes of shedding pattern of the wake structures from the centerbody, namely the mode one wake and the mode zero wake. In both modes, the shear-layer mode jet vortex rings in the outer layer are perturbed by the shedding of wake structures in the inner region and interaction involving primary merging of three successive jet vortex rings or their partial circumferential sections is found. This results in the formation of wake-induced structures of the corresponding mode pattern, which possesses concentration of coherent vorticity and fluid circulation over a large spatial extent at 1 < x/D >2. Secondary interactions, such as vortex tearing, are also observed. | Evolution of coherent structures and their interaction dynamics are educed in the near field of an acoustically excited basic annular jet using conditional sampling technique based on a multiple triggering criterion to detect the two dominating modes of structure pattern. Acoustic excitation is applied with an aim to better organize the phase alignment of initial rolling and pairing process in the outer shear layer. Negligible modification of the time-averaged flow field results from the excitation. The educed coherent vorticities show that the two modes of evolution are due to the corresponding two modes of shedding pattern of the wake structures from the centerbody, namely the mode one wake and the mode zero wake. In both modes, the shear-layer mode jet vortex rings in the outer layer are perturbed by the shedding of wake structures in the inner region and interaction involving primary merging of three successive jet vortex rings or their partial circumferential sections is found. This results in the formation of wake-induced structures of the corresponding mode pattern, which possesses concentration of coherent vorticity and fluid circulation over a large spatial extent at 1<x/D<2. Secondary interactions, such as vortex tearing, are also observed.en_US
dc.languageengen_US
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/etfsen_US
dc.relation.ispartofExperimental Thermal and Fluid Scienceen_US
dc.rightsExperimental Thermal and Fluid Science. Copyright © Elsevier Inc.-
dc.titleDynamics of interaction modes in excited annular jetsen_US
dc.typeArticleen_US
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0894-1777&volume=17 &issue=4&spage=319 &epage= 338&date=1998&atitle=Dynamics+of+interaction+modes+in+an+excited+annular+jet-
dc.identifier.emailKo, NWM: nwmko@hkucc.hku.hken_US
dc.identifier.emailLam, KM: kmlam@hku.hk-
dc.identifier.authorityLam, KM=rp00134en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0894-1777(98)10004-3en_US
dc.identifier.scopuseid_2-s2.0-0032144880en_US
dc.identifier.hkuros43657-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032144880&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume17en_US
dc.identifier.issue4en_US
dc.identifier.spage319en_US
dc.identifier.epage338en_US
dc.identifier.isiWOS:000075008500005-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridKo, NWM=24522564300en_US
dc.identifier.scopusauthoridLau, KK=24383647400en_US
dc.identifier.scopusauthoridLam, KM=7403656958en_US

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