Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(11)
Published: Nov. 1, 2024
This
paper
presents
an
experimental
investigation
of
flow-induced
vibration
characteristics
cut-corner
prisms
with
various
aspect
ratios
(H*
=
1.0–13.33).
Experiments
were
conducted
in
a
recirculating
wind
tunnel
Reynolds
numbers
ranging
from
2651
to
7953,
based
on
the
prism's
side
length.
Four
prism
types
(square,
PS
0.2D,
0.5D,
and
0.8D,
where
is
length
parallel
incoming
flow)
exhibited
five
distinct
modes
as
speed
increased:
vortex-induced
(VIV),
transition
VIV
galloping,
pure
separated
weak
VIV-like
coupled
galloping.
Compared
square
prism,
mode
galloping
at
higher
ratios.
As
H*
increases,
end
effects
diminish,
resulting
more
concentrated
vortex
shedding
disappearance
splitting.
The
transitions
2S
(two
single
vortices
shed
per
cycle)
2
P
pairs
cycle).
Additionally,
largest
amplitude
0.8D
0.5D.
Unilateral
close-view
particle
image
velocimetry
results
show
that
decreases,
shear
layer
stretched
away
rear
due
effects,
altering
interaction
between
causing
modes.
study
provides
valuable
insights
for
optimizing
design
piezoelectric
energy
harvesters.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(6)
Published: June 1, 2024
In
this
paper,
an
experimental
study
of
the
performance
energy
harvester
was
conducted
to
investigate
effect
length
parallel
side
(PS)
on
cut-corner
prism.
The
experiments
were
carried
out
in
a
recirculating
wind
tunnel
within
range
Reynolds
numbers
from
2284
8893,
based
edge
D
prism,
and
PS
=
0.2D–0.8D.
results
show
that
peak
vibration
amplitude
prism
initially
rises
then
gradually
declines
with
increasing
PS.
Particularly,
maximum
observed
at
0.5D
is
improved
by
approximately
1.9
times
compared
square
Within
speed
investigated,
experiences
three
modes:
initial
branch
vortex-induced
vibration,
transition,
galloping.
will
cause
vibrations
reach
galloping
mode
earlier
As
modes
wake
flow
structures
shift
2S
shedding
mode,
where
two
single
vortices
are
shed
per
cycle,
2P
characterized
pairs
cycle.
For
finite-length
phenomenon
vortex
splitting
due
upwash
downwash
flows.
Before
surpasses
critical
value,
lateral
reattachment
vanishes
length,
leading
decrease
shear
layer
curvature
separating
bubble
size,
while
enhancing
negative
pressure
strength.
However,
exceeding
value
allows
reattachment,
reducing
amplitude.
This
explains
why
efficiency
non-monotonic.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(11)
Published: Nov. 1, 2024
This
paper
presents
an
experimental
investigation
of
flow-induced
vibration
characteristics
cut-corner
prisms
with
various
aspect
ratios
(H*
=
1.0–13.33).
Experiments
were
conducted
in
a
recirculating
wind
tunnel
Reynolds
numbers
ranging
from
2651
to
7953,
based
on
the
prism's
side
length.
Four
prism
types
(square,
PS
0.2D,
0.5D,
and
0.8D,
where
is
length
parallel
incoming
flow)
exhibited
five
distinct
modes
as
speed
increased:
vortex-induced
(VIV),
transition
VIV
galloping,
pure
separated
weak
VIV-like
coupled
galloping.
Compared
square
prism,
mode
galloping
at
higher
ratios.
As
H*
increases,
end
effects
diminish,
resulting
more
concentrated
vortex
shedding
disappearance
splitting.
The
transitions
2S
(two
single
vortices
shed
per
cycle)
2
P
pairs
cycle).
Additionally,
largest
amplitude
0.8D
0.5D.
Unilateral
close-view
particle
image
velocimetry
results
show
that
decreases,
shear
layer
stretched
away
rear
due
effects,
altering
interaction
between
causing
modes.
study
provides
valuable
insights
for
optimizing
design
piezoelectric
energy
harvesters.
