Water,
Journal Year:
2024,
Volume and Issue:
16(21), P. 3100 - 3100
Published: Oct. 29, 2024
The
process
pump
as
turbine
(PPAT)
serves
a
crucial
component
for
recovering
high-pressure
energy
from
mediums
used
in
chemical
and
refining
processes.
Ensuring
the
long-term
safe
stable
operation
of
PPAT
high-temperature
environments
is
essential,
with
pressure
pulsation
being
one
its
most
significant
external
characteristic
indicators.
This
study
investigates
evolution
vortex
structure
distribution
generation
propagation
mechanisms
two-stage
operating
mode.
Results
indicate
that
uniformity
coefficient
(Cp)
gradient
poorer
first
stage
runner
compared
to
second
stage,
larger
area
high-strength
vortices.
In
draft
tube,
strength
increases
rising
flow
rates,
around
circular
cylinder
on
side
gradually
develops
both
sides.
diffusers,
primary
source
dynamic
static
interference
effect
between
two
impellers
corresponding
diffuser
tongue.
interstage
frequency
n*15fn
pronounced
inflow
runner,
weakening
along
direction,
ultimately
disappearing
tube.
addition,
more
low-frequency
signals
0.5fn
are
captured
tube
under
large
conditions,
which
mainly
generated
by
band
high
attenuation
slow,
has
great
destructive
recovery
system
PPAT.
Journal of Marine Science and Engineering,
Journal Year:
2023,
Volume and Issue:
11(2), P. 268 - 268
Published: Jan. 24, 2023
A
bi-directional
pump
is
designed
by
using
S-shaped
hydrofoil,
the
most
convenient
way
to
achieve
operation.
In
this
paper,
high-speed
photography
used
visualize
flow
field
characteristics
of
bidirectional
under
different
cavitation
numbers,
and
changes
caused
are
quantitatively
analyzed
in
combination
with
pressure
pulsation
sensor.
The
results
show
that
operation
efficiency
reverse
lower
than
forward
Tip
clearance
occurs
on
both
suction
surfaces
impeller
large
flow.
operation,
influence
guide
vane
main
frequency
obvious.
quasi-periodic
vertical
phenomenon
increases
amplitude
becomes
component
internal
axial
pump.
Physics of Fluids,
Journal Year:
2022,
Volume and Issue:
34(11)
Published: Oct. 2, 2022
In
this
paper,
the
simple
coupled
level-set
and
volume
of
fluid
bifurcation
models
are
used
for
accurate
prediction
flow
in
an
open
pump
intake
with
a
vertical
pipe.
The
continuous
wavelet
transform,
which
is
suitable
vortex
detection,
applied
to
pressure
signals
near
both
air-entrained
subsurface
vortices.
Low-frequency
long
duration
due
wandering
broadband
short
floor
vortices
(dominant
vortices)
generation
extreme
strong
observed.
motion
mechanism
revealed
by
analysis
transport
equation
vorticity's
enstrophy.
Different
from
previous
results
tilting
effect
controls
motion,
stretching
found
be
dominating
when
it
large
enough.
When
going
through
bell
mouth,
vortex's
vorticity
changes
sign
strengthens
same
sign.
On
plane
three
patterns,
including
co-rotating
pair,
merging,
counter-rotating
onset
criterion
merging
at
a/b
=
0.29–0.32
applicable
present
case.
pair
more
stable.
Air-entrained
serves
as
amplification
generated
subsurface.
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(1)
Published: Jan. 1, 2025
The
aim
of
this
study
is
to
analyze
the
causes
and
mechanisms
axial
force
generation
in
nuclear
reactor
coolant
pump
(RCP)
through
experimental
numerical
simulation
methods,
so
as
investigate
hydraulic
design
methods
reduce
force.
RCP
model
pressure
values
at
monitoring
points
chamber
were
obtained
experiments,
flow
visualization
was
constructed
using
methods.
It
found
that
outer-side
Fo
has
greatest
influence
on
force,
essence
which
liquid
front
rear
chambers
shroud
hub
impeller,
size
increases
with
increase
radius,
related
impeller
outlet
pressure.
By
adjusting
combination
exit
angles,
impact
investigated.
reducing
angle
near
can
significantly
lower
fluid
chamber,
thereby
acting
while
maintaining
performance
unchanged.
conclusions
serve
a
reference
for
improving
operational
safety
service
life
RCPs.
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(5)
Published: May 1, 2025
Sediment-laden
surface
vortices
in
pump
sump
represent
a
three-phase
flow,
comprising
gas,
liquid,
and
solid
phases,
surpassing
the
complexity
of
clear
water
vortices,
which
has
also
more
serious
effect
on
hydraulic
machinery.
In
this
paper,
focusing
sediment-laden
free
model
experiment
was
employed
to
investigate
their
motion
characteristics.
The
spatiotemporal
evolution
been
captured
through
three-dimensional
velocity
testing,
revealing
particle
aggregation
dispersion
patterns
within
vortex
cores
at
various
stages.
Radial
core
accelerates
inward
movement
particles,
while
axial
enhances
vertical
transport.
scale
sandy
is
larger
than
that
approximately
1.2
times
size,
rotational
lower
for
with
maximum
velocities
1.04
0.5
m/s,
respectively.
suction
speed
6.1
initial
stage,
sediment-carrying
capacity
21
greater.
Finally,
mechanism
characteristics
transporting
sand
air
are
discussed,
along
detrimental
effects
sediment
erosion
research
findings
paper
have
significant
theoretical
engineering
values.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(6)
Published: June 1, 2024
Vortex
breakdown
in
a
pump
sump
is
complex
and
negative
factor
for
the
pump.
Different
from
my
previous
study
that
focused
mainly
on
development
process
of
vortex
its
damage
to
pump,
this
paper
new
perspective
studies
energy
dissipation
time–frequency
characteristics
induced
by
breakdown.
The
tested
data
pressure
velocity
were
obtained
model.
Considering
gas–liquid
two-phase
flow
vortices,
numerical
simulation
approach
conducted
verified.
results
show
rules
reveal
initiated
near
blade.
residual
disturbance
field
continues
propagate
after
breakdown,
inducing
unstable
inside
runner
causing
additional
dissipation.
indicated
rotation
speed
has
significant
effect
frequency
relatively
small
under
high-speed
rotation.
Through
discussion,
it
can
be
concluded
order
reduce
harm
take
measures
such
as
controlling
impeller
speed,
stalling
anti-vortex
measures,
adjusting
operating
conditions.
