Flow Characteristics and Pressure Pulsation Analysis of Cavitation Induced in a Double-Volute Centrifugal Pump
Water,
Год журнала:
2025,
Номер
17(3), С. 445 - 445
Опубликована: Фев. 5, 2025
Cavitation
is
a
complex
multiphase
flow
phenomenon,
and
the
generation
of
transient
phase
transitions
between
liquid
vapor
during
cavitation
development
leads
to
multi-scale
vortex
motion.
The
dynamics
centrifugal
pump’s
rotor–stator
interaction
will
induce
pressure
fluctuations
in
impeller
volute
fluid
pump,
resulting
field
structure.
Based
on
Schnerr–Sauer
model
SST
k-ω
turbulence
model,
this
paper
studies
characteristics
cavitation-induced
unsteady
pump
excitation
response
pulsation
under
different
conditions,
taking
large
vertical
double-volute
as
research
object.
results
indicate
following:
As
rotates,
external
response,
jet-wake
structure
at
blade
outlet
shows
an
increase
frequency
signal.
This
evident
near
measurement
points
tongue
separator.
When
severe
occurs,
maximum
amplitude
shifts
from
(30°)
downstream
(45°).
value
fpmax
3.1
times
that
when
NPSHa
=
8.88
m.
By
applying
Omega
identification
method,
it
can
be
seen
vortices
trailing
edge
stable
undergoes
process
elongation,
fusion,
separation,
recovery.
represents
influence
volute.
Q
0.9Qd,
passage
tail
detaching
dissipating
path
observed,
demonstrating
upstream
impeller.
Язык: Английский
Study on rotating stall characteristics of centrifugal pumps based on gamma transition model
Physics of Fluids,
Год журнала:
2024,
Номер
36(5)
Опубликована: Май 1, 2024
The
phenomenon
of
rotating
stall
in
centrifugal
pumps
is
closely
associated
with
the
evolution
blade
boundary
layer.
Aiming
to
accurately
predict
characteristics
layer,
this
study
investigates
pump
impellers
using
gamma
(γ)
transition
model.
accuracy
numerical
simulation
was
confirmed
by
comparing
its
conclusions
results
testing.
In
calculations
considering
characteristics,
distribution
low-pressure
areas
inside
impeller
relatively
discontinuous,
while
pressure
more
uniform.
However,
without
transition,
regions
neighboring
flow
channels
exhibit
a
tendency
be
interconnected,
resulting
variable
distribution,
and
contour
at
outlet
closer
parallel.
dynamic
were
obtained
through
mode
decomposition
method,
including
frequency,
structure,
process
vortex.
Through
modal
reconstruction,
it
discovered
that
impeller's
rotation
causes
vortex
undergo
periodic
fluctuations.
not
stationary
but
moves
synchronously
blades.
At
different
time
points,
exhibits
changes.
suction
entrance,
initially
appears.
Subsequently,
multiple
structures
resulted
channel
blockage.
After
period
development,
excess
merge
generate
typical
“8”
shaped
structure
move
toward
exit.
Finally,
exit
disappears,
new
generated
inlet
surface.
Язык: Английский
Assessment of viscosity effects on high-speed coolant pump performance
Physics of Fluids,
Год журнала:
2024,
Номер
36(5)
Опубликована: Май 1, 2024
The
high-speed
coolant
pump
facilitates
thermal
regulation
in
electric
vehicle
components,
including
batteries
and
motors,
by
circulating
an
ethylene
glycol
solution.
This
commonly
used
fluid
exhibits
a
notable
negative
correlation
with
temperature
terms
of
viscosity.
Numerical
simulations
investigate
the
transient
dynamics
operating
at
6000
rpm,
driving
flow
various
temperatures.
A
test
rig
is
established,
performance
evaluated
under
different
conditions.
numerical
temperatures
align
well
experimental
outcomes.
Decreasing
temperatures,
from
100
to
−20
°C,
lead
reduced
head
efficiency
due
increased
Specifically,
rate
30
L/min,
decreases
40.03%
44.19%.
With
escalating
viscosity,
best
point
shifts
toward
lower
rates.
Notable
impacts
on
both
disk
hydraulic
are
observed
viscosity
fluctuations.
It
exerts
minimal
influence
volumetric
elevated
rates
but
has
substantial
impact
Increased
causes
uneven
pressure
distribution
within
pump,
altering
velocity
profiles
impeller.
High-viscosity
fluids
tend
form
large-scale
vortex
structures
around
blades,
reducing
thrust
exerted
blades
fluid.
Higher
results
larger
increasing
frictional
resistance.
study
findings
provide
valuable
insights
for
advancement
high-efficiency,
energy-saving,
pumps
tailored
vehicles.
Язык: Английский
Frictional drag and turbulent dissipation in a water-ring vacuum pump
Physics of Fluids,
Год журнала:
2025,
Номер
37(1)
Опубликована: Янв. 1, 2025
The
water-ring
vacuum
pump
is
a
crucial
piece
of
negative
pressure
extraction
equipment,
extensively
utilized
in
gas
and
wind
tunnel
applications.
While
pumps
offer
numerous
advantages,
including
safety
reliability,
they
also
present
drawbacks
such
as
low
efficiency
high
energy
consumption.
operational
these
one
their
most
significant
performance
indicators
serves
the
foundation
for
evaluating
Enhancing
currently
at
forefront
research
area
interest.
influenced
by
multiple
factors.
This
article
focuses
on
two
critical
factors
that
impact
water
ring
pumps:
casing
friction
turbulent
dissipation.
study
employs
theoretical
analysis
simulation
to
compare
under
both
rotating
non-rotating
conditions,
thereby
analyzing
power
loss
associated
with
dissipation
within
ring.
At
an
ideal
impeller
speed
3000
r/min,
corresponding
characteristic
Reynolds
number
Re
=
1.88
×
105.
results
indicate
(1)
consumed
0.4
kW,
while
lost
due
amounts
1.2
kW;
(2)
when
rotates
1000
consumption
decreases
0.16
representing
reduction
approximately
60%;
from
drops
reflecting
87%
decrease;
(3)
2000
further
0.056
86%.
0.046
indicating
96%.
presents
finding
rotation
can
markedly
weaken
dissipation,
providing
valuable
insights
design
high-efficiency
pumps.
Язык: Английский
Rotational stall and pressure fluctuations in centrifugal pump impellers with transient flow rates
Physics of Fluids,
Год журнала:
2025,
Номер
37(3)
Опубликована: Март 1, 2025
To
investigate
the
characteristics
of
rotational
stall
and
pressure
fluctuations,
this
study
presents
two
large
eddy
simulations
for
five-blade
seven-blade
centrifugal
pump
impellers
under
transient
condition.
The
condition
represents
that
flow
rate
speed
are
sinusoidal
constant,
respectively.
Research
shows
processes
germination,
transition
stabilization
clearly
discerned
in
evolution
during
both
dropping
rising
stages.
increase
number
blades
enhances
uniformity
time-averaged
normal
vorticity
distributions
among
different
passages
has
negligible
influence
on
total
vorticity.
low-frequency
fluctuations
range
impeller
is
greater
compared
to
impeller.
high-frequency
components
intense
primarily
at
leading
trailing
edges
blade,
especially
when
instantaneous
below
half
load.
first-order
dominant
frequency
identical
inlet
passages,
results
a
reduction
amplitude.
Язык: Английский