Micromachines,
Journal Year:
2023,
Volume and Issue:
14(2), P. 406 - 406
Published: Feb. 8, 2023
The
centrifugal
blood
pump
is
a
commonly
used
ventricular
assist
device.
It
can
replace
part
of
the
heart
function,
pumping
throughout
body
in
order
to
maintain
normal
function.
However,
high
shear
stress
caused
by
impeller
rotating
at
speeds
lead
hemolysis
and,
as
consequence,
stroke
and
other
syndromes.
Therefore,
reducing
level
while
ensuring
adequate
pressure
generation
key
optimization
pumps.
In
this
study,
screw
was
research
object.
addition,
were
optimized
simultaneously
using
coupled
algorithm
composed
random
forest
(RF)
multi-objective
gray
wolf
(MOGWO).
After
verifying
prediction
accuracy
algorithm,
three
models
selected
compared
with
baseline
model
terms
cloud,
2D
streamline,
SSS
distribution,
HI
vortex
distribution.
Finally,
via
comprehensive
evaluation,
final
design,
which
increased
24%
value
decreased
48%.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(11)
Published: Nov. 1, 2024
Complex
flow
patterns
in
a
large
vertical
centrifugal
pump
(LVCP)
when
operating
the
hump
region
under
cavitation
conditions
should
deserve
more
attention.
This
research
investigates
interaction
between
and
vortices
LVCP
from
perspective
of
rigid
vortex
transport
characteristics
modal
decomposition.
The
are
pronounced
cavitation.
backflow
at
impeller
inlet
leading
edge
diffuser
vanes
can
be
found
part-load
conditions.
Rigid
analysis
reveals
low
pressure
generated
pipe.
fusion
separation
with
surface
shedding
high
trailing
generates
unique
stall
gradient.
Under
conditions,
combination
stretching,
dilation
(RVD),
coriolis
force,
baroclinic
torque
(BT)
cause
further
increase
strength
tail
vortices.
RVD
BT
caused
by
accelerate
development
vortices,
diffuser,
then
generate
gradient
advance.
Proper
orthogonal
decomposition
indicates
that
occupy
main
energy
pattern.
pattern
is
superimposed
variety
different
frequency
characteristics,
these
show
particular
signal
well
below
fn.
interacts
to
induce
easily,
always
dominate
evolution.
Engineering Applications of Computational Fluid Mechanics,
Journal Year:
2023,
Volume and Issue:
17(1)
Published: Jan. 6, 2023
In
the
paper,
modulation
effect
of
rotor-stator
interaction
subjected
to
fluctuating
rotation
speed
is
investigated
numerically.
A
quasi-bivariate
variable
mode
decomposition
method
for
analyzing
non-stationary
flow
fields
proposed
first
time.
Different
from
previous
studies,
this
paper
emphasizes
local
features
transient
field
at
speed.
The
results
show
that
impact
on
impeller
force
limited,
but
it
significantly
impacts
pressure
pulsation
frequency.
correlation
between
amplitude
and
fluctuation
ratio
positive.
Meanwhile,
also
induces
sidebands
centered
blade
passing
frequency
its
harmonics.
periodic
changes
in
rotational
lead
pulsations.
magnitude
instantaneous
increases
as
grows.
change
well
synchronized
with
speed,
while
velocity
lags
behind
variation
mainly
attributed
two
aspects.
One
structure
frequency,
other
component
Micromachines,
Journal Year:
2023,
Volume and Issue:
14(2), P. 406 - 406
Published: Feb. 8, 2023
The
centrifugal
blood
pump
is
a
commonly
used
ventricular
assist
device.
It
can
replace
part
of
the
heart
function,
pumping
throughout
body
in
order
to
maintain
normal
function.
However,
high
shear
stress
caused
by
impeller
rotating
at
speeds
lead
hemolysis
and,
as
consequence,
stroke
and
other
syndromes.
Therefore,
reducing
level
while
ensuring
adequate
pressure
generation
key
optimization
pumps.
In
this
study,
screw
was
research
object.
addition,
were
optimized
simultaneously
using
coupled
algorithm
composed
random
forest
(RF)
multi-objective
gray
wolf
(MOGWO).
After
verifying
prediction
accuracy
algorithm,
three
models
selected
compared
with
baseline
model
terms
cloud,
2D
streamline,
SSS
distribution,
HI
vortex
distribution.
Finally,
via
comprehensive
evaluation,
final
design,
which
increased
24%
value
decreased
48%.
