Friction,
Journal Year:
2020,
Volume and Issue:
9(6), P. 1504 - 1527
Published: Nov. 9, 2020
Abstract
A
crosshead
slipper-guide
system,
which
bears
a
significant
thrust
force,
is
an
essential
friction
pair
in
low-speed
marine
diesel
engines.
Owing
to
the
low
moving
speed
of
slipper
during
engine
startup,
it
difficult
form
good
hydrodynamic
lubrication
between
and
guide.
Therefore,
detailed
analysis
startup
needed.
In
this
study,
new
transient
tribo-dynamic
model
for
process
presented.
The
consists
mixed
dynamic
models
piston
assembly,
connecting
rod,
crankshaft.
performances
under
rated
conditions
were
simulated
compared.
results
show
that
tribo-dynamics
are
significantly
different
from
those
conditions.
Some
measures
beneficial
may
increase
loss
system
process.
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(2)
Published: Feb. 1, 2025
To
enhance
the
performance
of
a
solid–liquid
two-phase
annular
jet
pump,
efficiency
and
energy
consumption
are
selected
as
objective
functions.
Using
design
experiments
method,
area
ratio,
nozzle
length,
diffuser
angle
identified
variables.
Optimal
Latin
hypercube
sampling
is
employed
to
generate
samples,
multi-objective
optimization
performed
using
particle
swarm
optimization-back
propagation
neural
network
combined
with
non-dominated
sorting
genetic
algorithm
II.
The
results
indicate
that
established
model
demonstrates
good
fitting
generalization
capabilities,
achieving
expected
predictive
outcomes.
After
structural
optimization,
overall
length
reduced.
In
terms
performance,
increases
3.1%,
reduces
34.3%.
distribution
low-pressure
zones
within
pump
reduced,
resulting
in
smoother
pressure
changes.
entropy
generation
region
extends
along
flow
direction
outlet,
but
rate
decreases,
significantly
reducing
losses
main
channel.
total
number
collisions
improving
wear
characteristics
internal
walls.
Energies,
Journal Year:
2018,
Volume and Issue:
11(5), P. 1048 - 1048
Published: April 25, 2018
The
hydraulic
design
method
of
controllable
blade
angle
for
rotodynamic
multiphase
pump
with
impeller
and
diffuser
is
proposed.
distribution
along
the
meridional
streamline
governed
by
normalized
fourth-order
first-order
polynomial
function
diffuser,
respectively.
orthogonal
optimization
five
factors
four
levels
employed
numerical
simulation
to
optimize
geometry
parameters,
including
shroud
at
leading
trailing
edge
βIs0,
βIs1,
difference
inlet
∆βI0,
coefficients
hub
kh,
ks.
According
analysis,
influence
each
factor
on
pressure
rise
estimated,
values
those
parameters
are
determined.
increased
12.8
kPa
in
comparison
base
pump.
Results
show
that
distributions
gas
volume
fraction
(GVF)
become
more
uniform
after
optimization,
which
improves
transporting
performance
Energies,
Journal Year:
2019,
Volume and Issue:
12(3), P. 461 - 461
Published: Jan. 31, 2019
In
oil
and
gas
exploitation,
the
multiphase
pump
is
a
vital
piece
of
equipment
to
guarantee
production
with
high
efficiency
stable
operation.
The
complicated
pattern
flow
in
affects
performance;
for
this
reason,
performance
inner
should
be
sufficiently
investigated.
present
work,
liquid-gas
designed
manufactured,
then
tested
specialized
test
rig
reveal
transient
pressure
characteristics
pump.
Results
show
that
dominant
frequency
under
water
water-air
conditions
blade
passing
frequency,
which
induced
by
rotor
stator
interaction.
downstream
impeller,
fluctuation
obviously
weakened,
because
splitter-blade
design
could
improve
control
ability
region.
comparison
condition,
condition
greatly
increases,
multiples
impeller
rotating
are
stimulated
due
movement
merging
air
bubbles.
Finally,
correlation
phase
distribution
revealed
using
high-speed
camera.
With
gradual
rise
from
inlet
outlet,
relative
separation
two
phases
induce
violent
fluctuations.
Science Progress,
Journal Year:
2019,
Volume and Issue:
103(1)
Published: Oct. 20, 2019
To
study
the
effects
of
performance
different
types
impeller
on
vortex
pump,
orthogonal
test
design,
which
is
carried
out
by
combining
experimental
and
numerical
calculation,
adopted
to
optimize
type
design
structure
for
in
pump.
find
folding
blade
angle,
position
point
whole
blade,
whether
wedge
an
scheme
with
three
factors
two
levels
designed.
A
simulation
conducted
each
analyzing
curve
plan
optimal
program
data
obtain
primary
secondary
orders
impact
angle
blades
blades,
shape
blades.
The
results
show
that
optical
combination
R30F60,
at
2/3
does
not
adopt
radial
wedge.
36%
higher
than
value
rated
flow
head,
efficiency
18.75%
value,
high-efficiency
zone
pump
wider,
meets
requirements.
Through
cycle
can
be
shortened
effectively,
level
improved,
hydraulic
model
superior
obtained.
Processes,
Journal Year:
2019,
Volume and Issue:
7(5), P. 246 - 246
Published: April 27, 2019
Double-suction
centrifugal
pumps
are
widely
used
in
industrial
and
agricultural
applications
since
their
flow
rate
is
twice
that
of
single-suction
with
the
same
impeller
diameter.
They
usually
run
for
longer,
which
makes
them
susceptible
to
cavitation,
putting
downstream
components
at
risk.
A
fast
approach
predicting
Net
Positive
Suction
Head
required
was
applied
perform
a
multi-objective
optimization
on
double-suction
pump.
An
L32
(84)
orthogonal
array
designed
evaluate
8
geometrical
parameters
4
levels
each.
two-layer
feedforward
neural
network
genetic
algorithm
solve
problem
into
pareto
solutions.
The
results
were
validated
by
numerical
simulation
compared
original
design.
suction
performance
improved
7.26%,
3.9%,
4.5%
3.8%
conditions
0.6Qd,
0.8Qd,
1.0Qd
1.2Qd
respectively.
efficiency
increased
1.53%
1.1%
0.8Qd.
streamline
blade
surface
vapor
volume
fraction
optimized
much
smaller
than
impeller.
This
study
established
cavitation
parametric
database
both
hub
shroud
angles
double
pump
Engineering Optimization,
Journal Year:
2021,
Volume and Issue:
54(8), P. 1395 - 1412
Published: July 5, 2021
The
input
power
to
a
centrifugal
pump
is
optimized
by
changing
the
impeller
blade
exit
angle.
In
optimization,
angles
of
three
meridional
profile
layers
are
selected
as
design
variables,
while
shaft
and
head
developed
multi-objective
optimization
functions
obtained
through
surrogate
model.
A
genetic
algorithm
used
find
optimum
point.
Computational
fluid
dynamics
simulations
performed
solve
Reynolds-averaged
Navier–Stokes
equations
using
shear-stress
transport
turbulence
model
for
closure
term.
Manipulation
angle
affects
both
efficiency
without
affecting
at
best
point,
corresponding
mass
flow
rate
1.75
kg/s.
point
shows
an
enhancement
(>10%)
in
efficiency.
Improved
separation
near
trailing
edge
uniform
loading
decreases
required
impeller.
