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Vortex-meter design :
Vortex-meter design : The influence of shedding-body geometry on shedding characteristics
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- Ford, C. L. (författare)
- KTH,Mekanik
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- Winroth, P. Marcus (författare)
- KTH,Strömningsfysik
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- Alfredsson, P. Henrik (författare)
- KTH,Strömningsfysik
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(creator_code:org_t)
- Elsevier Ltd, 2018
- 2018
- Engelska.
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Ingår i: Flow Measurement and Instrumentation. - : Elsevier Ltd. - 0955-5986 .- 1873-6998. ; 59, s. 88-102
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Nyckelord
- 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
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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