Frontiers in Energy Research,
Journal Year:
2024,
Volume and Issue:
12
Published: Oct. 16, 2024
With
the
advancement
of
Fuel
Cell
Vehicles
(FCVs),
detecting
hydrogen
leaks
is
critically
important
in
facilities
such
as
refilling
stations.
Despite
its
significance,
dynamic
response
performance
sensors
confined
spaces,
particularly
under
ceilings,
has
not
been
comprehensively
assessed.
This
study
utilizes
a
catalytic
combustion
sensor
to
monitor
area.
It
examines
effects
leak
size
and
placement
height
on
distribution
concentrations
beneath
ceiling.
Results
indicate
that
concentration
rapidly
decreases
within
0.5–1.0
m
range
below
ceiling
declines
more
gradually
from
1.0
2.0
m.
The
further
explores
attenuation
pattern
radially
jet
By
normalizing
radius
concentration,
it
was
determined
conforms
Gaussian
model,
akin
observed
open
space
flows.
Utilizing
this
assumption,
model
refined
by
incorporating
an
impact
reflux
term,
thereby
enhancing
accuracy
predictive
formula.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(12)
Published: Dec. 1, 2024
The
trends
and
future
directions
of
hydrogen
safety
research
cannot
be
separated
from
the
thermodynamic
behavior
combustion
explosion,
spontaneous
combustion,
flame
propagation
behavior,
mechanisms,
other
related
topics.
In
this
paper,
through
method
numerical
simulation,
considering
detonation
characteristics
in
annular
section
chamber
commonly
used
gas
turbines,
form
impact
channel
are
evaluated.
By
discussing
deflagration
to
transition
hydrogen/air
premixed
under
different
working
conditions,
it
is
found
that
propagates
close
inner
wall
forms
a
strong
expansion
turbulence
between
outer
flame.
surface
airflow
shear
accelerate
hydrogen.
area
on
side
tip
prone
set
off
detonation.
high-pressure
after
mainly
acts
symmetrical
end
face
ignition
area.
There
critical
temperature
make
strength
strongest
when
occurs.
Reducing
equivalence
ratio
filling
can
significantly
reduce
reaction
speed
weaken
wall.
When
less
than
certain
value,
completely
consumed
deflagration.
