In
this
paper,
a
study
on
the
stall
characteristics
of
NACA0009
blunt
trailing
edge
hydrofoil
is
carried
out
based
transition
model
and
dynamic
mode
decomposition
method.
The
surfaces
at
different
angles
attack
(AoA)and
Chord-based
Reynolds
numbers
(ReL)
are
obtained.
boundary
layer
dominated
by
natural
as
AoA
less
than
4°,
while
leading-edge
separation-induced
greater
4°.
laminar
separation
bubble
(LSB)
with
change
It
found
that
deep
occurs
when
vortex
near
trailing-edge
region
moves
upstream
fuses
LSB
causing
oscillation
lift
drag
coefficient.
relationship
between
established
using
DMD
methods.
modal
energy
occurs,
resulting
in
dominant
role
movement
toward
region,
finally
phenomenon
shedding
hydrofoil.
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.
Wind
energy
is
a
rare
and
valuable
resource
that
can
be
efficiently
harnessed
using
proper
extraction
mechanisms
to
interact
with
aerodynamic
surfaces.
It
plays
crucial
role
in
lift
increment
through
optimized
geometry
positioning
of
flow
control
devices.
By
introducing
additional
elements,
such
as
devices,
on
their
surfaces,
it
possible
enhance
the
by
delaying
stall
validation
power
enhancement
This
review
paper
aims
provide
detailed
view
vortex
generator
surfaces
aircraft
wings
horizontal
axis
wind
turbine
blades
lift/power
increment,
delay,
effects
performance.
A
achieves
separation
keeping
attached
boundary
layer
along
under
specified
operating
conditions.
In
this
paper,
various
geometrical
parameters
profile,
chordwise
position,
height,
spacing
between
pairs,
inclination
surface,
array
configuration,
computational
turbulence
model
selection,
user-defined
functions,
codes,
scaled
&
complete
analysis
resultant
effect
performance
are
explained
detail
suitable
schematics
tables.
design
table
created
from
voluminous
research
undertaken
previous
decades,
intending
seen
reference
for
give
collective
idea
operation
generators
effectiveness
delay
varied
Physics of Fluids,
Год журнала:
2023,
Номер
35(10)
Опубликована: Окт. 1, 2023
The
phenomenon
of
water–jet
pump
stall
can
be
ascribed
to
the
development
blade
boundary
layer
separation
with
transition
process
playing
a
significant
role
in
this
separation.
hydrofoil
is
usually
used
as
simplified
model
impeller
blade,
and
its
flow
field
characteristics
have
important
reference
values
for
analyzing
flow.
Based
on
dynamic
mode
decomposition
method,
article
presents
results
study
that
was
carried
out
NACA0009
blunt
trailing
edge
hydrofoil.
surfaces
at
different
angles
attack
(AoA)and
Chord-based
Reynolds
numbers
(ReL)
are
obtained.
dominated
by
natural
AoA
less
than
4°,
while
leading-edge
separation-induced
greater
4°.
investigation
yields
properties
LSB
(Laminar
Separation
Bubble)
varied.
known
deep
distinguished
movement
vortex
toward
upstream
direction
near
trailing-edge
region,
where
it
merges
region.
This
leads
oscillations
lift
drag
coefficients.
relationship
between
established
using
DMD
(Dynamic
Mode
Decomposition)
methods.
As
occurs,
observed
modal
energy
comparatively
higher
vortex,
inducing
dominant
region
and,
consequently,
shedding
findings
could
guidance
design
fluid
machinery
blades.
The
natural
transition
of
the
boundary
layer
on
a
hydrofoil
with
superhydrophobic
surfaces
is
investigated
using
numerical
methods.
A
novel
calculation
approach
featuring
adapted
vertical
mesh
basic
laminar
flows
hydrofoils
proposed
and
validated
against
experimental
velocity
profiles.
eN
method,
corroborated
by
data,
employed
to
predict
locations
layers.
It
observed
that
surface
stabilizes
layer,
thereby
delaying
hydrofoil.
As
slip
length
increases,
this
delay
effect
becomes
stronger.
For
surfaces,
it
consistently
occurs
location
suction
side
takes
place
further
downstream
than
its
pressure
side,
aligning
established
principles
regarding
ordinary
surfaces.
new
passive
flow
control
strategy,
different
applied
can
be
utilized
achieve
symmetrical
characteristics
asymmetric
hydrofoils.
Furthermore,
transitional
behaviors
only
one
are
discussed.
found
presence
introduces
distinct
influences
behavior
opposing
lacks
such
surface,
which
may
attributed
move
in
stagnation
point
located
side.
Stall
usually
occurs
in
the
hump
area
of
head
curve,
which
will
block
channel
and
aggravate
pump
vibration.
For
centrifugal
pumps
with
guide
vanes
have
a
clocking
effect,
stall
characteristic
at
different
positions
should
be
focused.
In
this
paper,
flow
field
under
conditions
is
numerically
simulated,
rotor–stator
interaction
effects
are
studied.
The
double-hump
found
curve
by
using
SAS
(Scale
Adaptive
Simulation)
model.
close
to
optimal
working
condition
caused
hydraulic
loss,
while
far
away
from
point
combined
action
Euler’s
loss.
model
can
accurately
calculate
wall
friction
thus
predicting
phenomenon.
pressure
fluctuation
characteristics
obtained.
It
that
when
outlet
line
volute
tongue,
corresponding
highest,
lowest.
mechanism
effect
obtained
simplifying
hydrofoil.
downstream
hydrofoil
leading
edge
always
interfered
upstream
wake,
wake
low
energy
mixes
boundary
layer
energy,
causes
small-pressure
pulsation.
results
could
used
for
operation
vanes.
Water,
Год журнала:
2022,
Номер
14(24), С. 4065 - 4065
Опубликована: Дек. 13, 2022
Double-entry
two-stage
double-suction
centrifugal
pumps
with
high
flow
rates
and
heads
are
used
in
some
large
water
supply
applications.
The
pressure
fluctuation
of
the
impeller
is
a
key
factor
influencing
vibration
pumps.
In
this
paper,
pump
simulated
verified
by
experiments,
distribution
two
stage
impellers
obtained.
study
on
time
domain
frequency
demonstrates
that
first-stage
single-suction
affected
twin
volute.
At
1.0
Q,
dominant
blade
suction
side
twice
rotation
frequency.
main
fluctuations
at
outlet
low
rate
higher
than
design
rate.
Pressure
second-stage
influenced
inter-stage
passage.
amplitudes
grow
incrementally
along
streamlined
direction.
impeller,
amplitude
0.6
Q
approximately
Q.
Research
paper
can
guide
operation
pump.
Mathematics,
Год журнала:
2023,
Номер
11(16), С. 3618 - 3618
Опубликована: Авг. 21, 2023
The
generation
of
hydro-mechanical
resonance
is
related
to
the
transition
boundary
layer
and
development
vortex
shedding.
application
effect
suction
control
in
hydrodynamics
equally
deserving
consideration
as
an
active
technique
aerodynamics.
This
study
examines
how
affects
flow
field
NACA0009
blunt
trailing
edge
hydrofoil
using
γ
model.
Firstly,
accuracy
numerical
method
checked
by
performing
a
three-dimensional
simulation.
Based
on
this,
research
conducted.
According
results,
increases
velocity
gradient
delays
position
transition.
frequency
shedding
wake
region
lowers,
peak
value
fluctuation
declines.
hydrodynamic
performance
may
be
successfully
improved
with
proper
selection
coefficient
via
around
hydrofoil.
lift/drag
ratio
goes
up
up.
displacement
thickness
momentum
are
at
their
lowest
points,
amplitude
its
point
Cμ
=
0.003.
When
slots
leading
edge,
loss
minimal
zone
negligible.
