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Vortex-meter design: The influence of shedding-body geometry on shedding characteristics
KTH.
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics.
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics.ORCID iD: 0000-0002-1146-3241
2018 (English)In: Flow Measurement and Instrumentation, ISSN 0955-5986, E-ISSN 1873-6998, Vol. 59, p. 88-102Article in journal (Refereed) Published
Abstract [en]

The periodic vortex shedding from bluff bodies may be used in flow metering applications. However, because the bluff-body is highly confined (typically in a pipe) the shed vortices may interact with the pipe wall; causing an undesirable non-linear behaviour. An experimental investigation has been conducted; examining the vortex-shedding characteristics of highly confined bluff-bodies in pipe flow, at high Reynolds number (ReD=4.4×104 to 4.4×105). The bluff-bodies were comprised of a forebody and tail; both of which affected the primary-shedding characteristics. The shedders typically produced two unsteady modes: Mode-I was associated with the vortex shedding and mode-II resulted from a separation of the pipe-wall boundary layer. The mode-I behaviour allowed two classes of shedder to be defined: long-tails and short-tails. Modes I and II interacted, particularly for long-tailed geometries. When the length-scale of mode-II exceeded 0.8κ (where κ is the physical scale of the primary shedding vortex), mode-II disrupted mode-I, as the mode-frequency ratio (fII/fI) approached an integer value. The coupling of modes I and II caused mode-I to deviate from its preferred Strouhal number. When the deviation exceeded 25–30%, mode-I locked on to the mode-II frequency. This did not happen for short-tailed geometries, as the length-scale of mode-I was always dominant. Mode-coupling for short-tails occurred only when the mode frequencies were equal. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 59, p. 88-102
Keywords [en]
Bluff-body, Compressible, Frequency-characteristic, Splitter-plate, Vortex-meter, Vortex-shedding, Boundary layer flow, Boundary layers, Geometry, Reynolds number, Vortex shedding, Bluff body, Coupling of modes, Experimental investigations, Frequency characteristic, High Reynolds number, Nonlinear behaviours, Splitter plates, Vortex flow
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223133DOI: 10.1016/j.flowmeasinst.2017.12.004ISI: 000428102800012Scopus ID: 2-s2.0-85039164249OAI: oai:DiVA.org:kth-223133DiVA, id: diva2:1193465
Note

Export Date: 13 February 2018; Article; CODEN: FMEIE; Correspondence Address: Ford, C.L.; KTHSweden; email: cford@mech.kth.se. QC 20180327

Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-04-11Bibliographically approved

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Alfredsson, P. Henrik

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