Machines,
Journal Year:
2024,
Volume and Issue:
12(10), P. 687 - 687
Published: Sept. 30, 2024
Due
to
the
effects
of
swing
motion,
performances
and
internal
flow
characteristics
marine
centrifugal
pump
undergo
some
unsteady
variations
in
environment.
The
hydraulic
test
system
with
six
degree
freedom
parallel
motion
platform
is
established
study
performance
at
different
heel
angles
steady
roll
position
pitch
position.
head
gradually
decreases
as
angle
increases.
has
decreased
by
7%
reach
minimum
15°
At
same
angle,
lower
than
that
under
rated
condition.
fluid
impeller
passage
subjected
additional
inertial
force
or
inducing
bias
phenomena
velocity
field.
development
induces
intense
vortex
shedding
dissipation
interblade
vortices
are
affected.
periodic
flow-induced
pulsation
obviously
appear
passage.
periodicity
pressure
amplitude
influenced
due
motion.
greater
excitation
fluid-induced
vibration
amplitude.
In
addition
low
frequencies,
20
times
shaft
frequency
evident
Physics of Fluids,
Journal Year:
2023,
Volume and Issue:
35(10)
Published: Oct. 1, 2023
Multi-stage
centrifugal
pumps
with
floating
impellers
provide
a
convenient
means
of
adjustment
to
meet
diverse
head
requirements.
These
utilize
sealing
gaskets
minimize
leakage
losses
and
restrict
impeller
axial
motion.
However,
the
impact
gasket
breakage
on
hydraulic
performance
internal
flow
remains
uncertain.
To
investigate
this,
novel
dynamic
mesh
simulation
method
is
proposed
enable
simultaneous
motion
rotation
impeller.
Validation
numerical
simulations
experiments
performed.
Transient
influenced
by
motion,
lagging
field
response.
Head
coefficient
efficiency
curves
exhibit
asymmetric
triangular
functions
higher
fluctuations
compared
fixed
position.
At
design
condition,
floating,
ranges
from
0.7
1.9,
while
29.7%
60.1%.
Among
various
loss
ratios,
ratio
exhibits
highest
magnitude,
followed
ratio,
shroud
friction
being
smallest.
Entropy
production
reveals
significant
influence
oscillation
local
loss.
The
causes
drastic
velocity
pressure
in
both
time
space.
Applied Sciences,
Journal Year:
2025,
Volume and Issue:
15(7), P. 3521 - 3521
Published: March 24, 2025
Large
curvature,
high
pre-swirl
large
high-speed
centrifugal
fans
are
the
preferred
choice
for
industrial
gas
quenching
furnaces,
as
they
need
to
operate
under
non-uniform
inlet
conditions
extended
periods.
The
resulting
distortion
disrupts
symmetric
flow
of
gas,
leading
reduced
fan
stability
and
phenomena
such
separation
rotational
stall.
This
issue
has
become
a
key
research
focus
in
field
applications.
paper
introduces
an
eddy
viscosity
correction
method,
compares
it
with
experimental
results
from
U-shaped
pipe
curved
flow.
corrected
SST
k-ω
model
shows
maximum
error
only
4.7%.
Simulation
show
that
generates
positive
inflow
relative
intensity
3.83°.
characteristics
within
impeller
passage
significantly
affected
by
swirl
angle
distribution.
At
angle,
leakage
at
blade
tip
develops
into
stall
vortex
spans
entire
passage,
average
blockage
coefficient
0.29.
minimum
downstream
is
suppressed
on
suction
side
main
flow,
structure
0.21.
To
address
design
challenges
distortion,
method
based
secondary
suppression
proposed.
Eleven
surfaces
selected
control
parameters,
profile
redesigned.
Numerical
simulations
furnace’s
temperature
fields
indicate
modified
reduces
strength,
decreasing
0.07
0.04,
respectively.
standard
deviation
velocity
test
section
42.78%
compared
original,
fluctuation
workpiece
surface
53.09%.
Both
uniformity
improved.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(3)
Published: March 1, 2024
A
two-way
pumping
station
is
a
specialized
device
that
facilitates
bidirectional
water
and
drainage.
The
pressure
pulsation
characteristics
of
stations
have
emerged
as
prominent
research
focus
in
the
field
hydraulic
engineering.
In
this
work,
with
aim
systematically
proposing
optimization
measures
to
ensure
operational
stability,
transient
numerical
simulation
conducted
elucidate
influence
mechanism
suspension
height
bell
mouth
(SHb)
on
internal
flow
station.
High-precision
experiments
are
performed
compare
time-frequency
domain
under
different
SHb
using
continuous
wavelet
transform
(CWT).
findings
indicate
an
appropriate
reduction
effectively
reduces
unstable
within
inlet
conduit,
consequently
reducing
impeller.
With
SHb,
influx
low-velocity
backflow
into
prevented
generation
propagation
suction
vortices
suppressed.
However,
amplifies
impact
between
mainstream
wall.
spatial
distribution
also
examined,
it
found
increases
intensity
side
facing
incoming
rear
side,
while
area
tends
exhibit
stability.
terms
characteristics,
reasonable
leads
improved
circumferential
uniformity
impeller
inflow
effective
suppression
low-frequency
disturbances.
Physics of Fluids,
Journal Year:
2023,
Volume and Issue:
35(7)
Published: July 1, 2023
This
paper
proposes
a
new
method
to
calculate
the
volumetric
efficiency
and
hydraulic
of
centrifugal
pumps
based
on
principle
energy
balance.
Two
efficiencies
are
calculated
by
means
low
specific
speed
pump
handling
media
with
different
viscosities
at
best
points
compared
those
two
existing
methods.
The
results
manifest
that
definition
in
present
is
more
precisive
sensitive
change
liquid
viscosity.
