Study On The Characteristics Of Horseshoe
Vortex System Upstream Of An Upright Square
Cylinder Subjected To A Dam-break Flow
Author(s)
C. Lin, Y.-C. Su, P.-H. Yeh & R. V. Raikar
Abstract
The velocity-field characteristics of time-dependent horseshoe vortex flow at the
juncture of an upright square cylinder and a base plate, which is subjected to an
unsteady dam-break flow, were investigated experimentally. Flow visualization
techniques and high-speed particle image velocimetry (HSPIV) were used to
explore both qualitatively and quantitatively the unsteady feature of the flow
field of horseshoe vortex structure at the juncture of square cylinder and base
plate, respectively.
The characteristics of the evolutionary horseshoe vortex system were
analyzed, including the position of primary vortex core, down-flow velocity
profile and the circulation of primary horseshoe vortex. The results show that air
bubble entrains into the vortex centre in front of the model only in the cases with
model-width varying from 3.0 cm to 5.0 cm. When the model width increases,
the bubble entraining to the vortex centre occurs earlier. The results also show
that the down-flow velocity profiles are highly affected by the vortex structures.
The relationship between flow characteristics and the time duration after the gate
is open is obtained by using regression analysis. The similarity of the position of
the down-flow is presented with dimensionless length and dimensionless
velocity as length and velocity scales, respectively.
Keywords: dam-break flow, horseshoe vortex, flow visualization technique, highspeed
particle image velocimetry, air entrainment.
Keywords
dam-break flow, horseshoe vortex, flow visualization technique, highspeedparticle image velocimetry, air entrainment.
Related Book
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