Rotor–stator
interaction
is
an
inherently
unsteady
phenomenon
in
turbomachinery
that
significantly
influences
the
performance
of
turbomachinery.
Accurate
prediction
rotor–stator
flow
remains
a
great
challenge
considering
computational
cost.
In
Reynolds-averaged
Navier–Stokes
framework,
harmonic
balance
(HB)
method
emerges
as
potential
reduced-order
modeling
technique,
offering
significant
savings
over
traditional
methods,
and
revealing
characteristics
are
elusive
to
steady
mixing-plane
method.
this
study,
graphical
processing
unit
(GPU)-based
solver
utilizing
finite
volume
developed
accelerate
computation
HB
compared
central
(CPU)-based
solver.
An
implicit
data-parallel
block-Jacobi
lower-upper
relaxation
(DP-BJ-LUR)
first
proposed
better
fit
distinct
parallel
architecture
GPU.
The
with
different
harmonics,
well
time
marching
method,
conducted
evaluate
accuracy
acceleration
for
convergence
by
quasi-three-dimensional
radial
slice
case
full
three-dimensional
National
Aeronautics
Space
Administration
(NASA)
Stage
35
compressor.
Acceleration
GPU-based
solver,
impact
steps
on
DP-BJ-LUR
numerical
detail.
A
maximum
speedup
102
times
1
90
12
harmonics
achieved
single
NVIDIA
Ray
Tracing
Texel
eXtreme
3080Ti
GPU
CPU-based
CPU
core
Intel®
Xeon®
Platinum
9242.
Separations,
Год журнала:
2025,
Номер
12(2), С. 50 - 50
Опубликована: Фев. 13, 2025
A
new
type
of
elliptical
cyclone
separator
has
been
proposed
recently,
but
the
flow
field
characteristics
within
industrial
device
still
need
to
be
further
investigated.
In
this
paper,
and
particle
motion
inside
circular
(with
a
long-to-short
axis
ratio
1.2),
with
equivalent
hydraulic
diameter
300
mm,
are
comparatively
analyzed
using
CFD
methods.
The
results
show
that
there
is
significant
change
in
distribution
compared
conventional
cyclone.
static
pressure
gradient
anisotropic
radial
direction.
overall
tangential
velocity
value
reduced,
which
reduces
friction
loss
makes
drop
significantly
lower.
More
importantly,
an
acceleration/deceleration
phenomenon
airflow
occurs
along
horizontal
circumference,
is,
transformed
into
circumferential
fluctuating
cyclonic
field.
This
induces
additional
inertial
separation
effect
compensates
for
unfavorable
effects
caused
by
reduced
centrifugal
strength.
Due
coupling
force
inertia
effect,
residence
time
small
particles
1
micron
shorter,
helps
reduce
backmixing
improves
efficiency
study
reveals
unique
cyclones,
helpful
understand
mechanism
wave
swirl
Journal of Turbomachinery,
Год журнала:
2024,
Номер
147(7)
Опубликована: Ноя. 7, 2024
Abstract
Flows
in
compressors
are
extremely
complex
with
various
scales.
Small-scale
turbulence,
middle-scale
rotor–stator
interaction
(RSI),
large-scale
corner
separation,
and
tip
leakage
flow
should
all
be
considered
the
simulation
of
compressors.
Recently,
a
new
hybrid
Reynolds-averaged
Navier–Stokes-large
eddy
(RANS-LES)
strategy
that
modifies
turbulent
viscosity
equation
based
on
Kolmogorov
energy
spectrum,
termed
grid-adaptive
(GAS)
method,
is
proposed
by
our
group
to
achieve
high
accuracy
using
different
grid
resolutions.
In
this
study,
GAS
method
shear
stress
transport
(SST)
turbulence
model
employed
simulate
RSI
just
RANS-like
resolution
single-stage
transonic
compressor
TUDa-GLR
open
test
case.
Compared
experiments
other
methods
(including
RANS
delayed
detached
(DDES)
methods),
results
show
can
significantly
improve
prediction
for
stall
margin
radial
distribution
parameters.
Then,
effect
secondary
structures
analyzed
unsteady
field
simulated
method.
Results
incorrect
rotor
vortex
breakdown
underestimation
mixing
losses
region
blamed
deviation
RANS.
An
intuitive
total
pressure
fluctuation
caused
wakes
observed
stator
inlet.
The
particle
tracking
shows
wake
from
suction
surface
has
strong
trend
into
stator.
Spectral
proper
orthogonal
decomposition
(SPOD)
also
utilized.
Unsteady
temporal–spatial
induced
local
unsteadiness
distinguished
SPOD,
which
includes
reverse
wave
generated
RSI.
SPOD
found
separation
side
exhibits
an
frequency
1.6
blade
passing
(BPF).
Journal of Turbomachinery,
Год журнала:
2024,
Номер
147(6)
Опубликована: Ноя. 27, 2024
Abstract
Blade
end
slots
have
been
proven
to
be
an
effective
method
suppress
corner
separation,
thereby
improving
the
aerodynamic
performance
of
compressor.
The
unsteady
effects
blade
affiliated
with
a
highly
loaded
compressor
cascade
on
separation
control
are
investigated
based
delayed
detached
eddy
simulation
under
Mach
number
0.59.
vortex
structures
between
datum
and
slotted
compared.
topologies
markedly
reorganized
suppressed
by
slots.
Unsteady
flow
behaviors
corresponding
dynamic
mechanisms
analyzed
in
both
time
frequency
domains.
interaction
self-adaptive
jet
from
results
smaller-scale
vortices
region
higher
characteristic
frequency.
Consequently,
caused
significantly
reduced
range
intensity
through
enhancement
mixing
rapid
dissipation
into
larger-scale
lower-frequency
features.
Furthermore,
spatiotemporal
features
dynamics
slot
using
enhanced
mode
decomposition
method.
Results
show
that
dominant
behavior
develops
better
stability,
intermittency
low-frequency
large-scale
is
via
control.
Energies,
Год журнала:
2024,
Номер
17(10), С. 2335 - 2335
Опубликована: Май 12, 2024
Plate
heat
exchangers
are
widely
used
in
the
Heating,
Ventilation,
and
Air
Conditioning
(HVAC)
field.
Cross-corrugated
triangular
ducts
commonly
employed
plate
exchangers.
Inserting
baffles
into
cross-corrugated
can
improve
transfer
performance
of
This
study
focuses
on
intricate
interdependencies
among
flow
channel
apex
angle,
trapezoidal
baffle
inclination
position,
Reynolds
number
(Re)
pressure
drop
using
response
surface
methodology
(RSM)
computational
fluid
dynamic
(CFD).
To
identify
factors
that
maximize
Nusselt
(Nu)
minimize
friction
factor
(f),
RSM
is
to
design
factors,
conduct
numerical
studies,
establish
regression
equations.
The
results
show
X-direction
Re
have
significantly
affected
Nu
f.
Compared
a
non-baffled
with
same
angle
conditions,
optimized
enhances
by
1.54
times
has
an
almost
identical
drop.
inclined
comprehensive
at
low
Re.
synergistic
effect
most
optimal
when
90°,
52.5°,
1000,
position
0.625H
X-direction.
Journal of the Global Power and Propulsion Society,
Год журнала:
2024,
Номер
8, С. 255 - 268
Опубликована: Июль 29, 2024
Cavitation
significantly
impacts
the
performance
of
hydraulic
machinery.
However,
cavitation
is
complex,
and
evolution
complex
vortical
structures
in
cavitating
flow
requires
further
investigation.
In
this
study,
unsteady
around
a
NACA0009
hydrofoil
with
gap
sizes
1
10
mm
simulated
using
grid-adaptive
simulation
(GAS),
which
novel
hybrid
method
that
modifies
turbulent
viscosity
based
on
Kolmogorov
energy
spectrum.
The
prediction
accuracy
GAS
validated
by
comparing
experimental
LES
results,
demonstrating
its
superiority
compared
to
scale-adaptive
simulation.
A
detailed
study
effect
size
an
emphasis
performed.
It
discovered
plays
crucial
role
development
structures,
as
well
their
interactions.
Moreover,
increases,
two-layer
structure
tip
leakage
vortex
(TLV)
becomes
more
pronounced.
inner
TLV
core
region
generated
vorticity
transport
from
TLV.
outer
layer
formed
mainstream,
separation
flow.
influences
stability
cavities.
investigation
aligns
previous
conclusions
compressors,
indicating
universal
phenomenon.
Journal of the Global Power and Propulsion Society,
Год журнала:
2024,
Номер
8, С. 405 - 420
Опубликована: Окт. 24, 2024
Tip
leakage
flow
(TLF)
is
an
important
structure
in
the
compressor,
and
it
has
a
significant
effect
on
efficiency
stability
of
compressor.
In
this
study,
dynamic
mode
decomposition
(DMD)
used
to
study
spatiotemporal
tip
compressor
rotor.
The
high-fidelity
field
calculated
via
delayed-detached
eddy
simulation
(DDES)
axial
rotor
as
input
dataset
for
DMD
algorithm.
results
show
that
unsteady
motion
vortex
(TLV)
quite
different
at
its
generation,
development,
dissipation
phases.
Additionally,
three
typical
structures,
oscillation
primary
TLV,
TLV
breakdown,
unsteadiness
blockage
cell,
identified
by
modes.
Unsteady
motions
also
largely
affect
loss
especially
after
breakdown.
provides
new
understanding,
which
could
be
helpful
modeling
or
control
TLF.
