Australian Journal of Mechanical Engineering,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 18
Published: Dec. 4, 2024
Interest
in
hydrogen-powered
engines
is
growing
due
to
their
potential
reduce
greenhouse
gas
emissions
and
decrease
reliance
on
fossil
fuels.
This
research
examines
how
the
start
of
combustion
(SOC)
impacts
performance
homogeneous
charge
compression
ignition
(HCCI)
using
hydrogen
exclusively.
Using
numerical
simulations
with
a
0D
multi-zone
HCCI
model,
study
investigates
parameters
such
as
ratio
(CR),
equivalence
(ER),
intake
temperature
(ICT)
assess
influence
engine
performance.
The
results
uncover
hydrogen's
unique
behaviour,
characterised
by
its
physiochemical
properties
low-temperature
combustion.
identifies
an
optimal
ER
range
0.1
0.3,
various
ICTs
it
playing
pivotal
role
promoting
auto-ignition
accelerating
However,
0.4
ICT
393
K
produces
relatively
higher
indicated
thermal
efficiency,
which
affected
knocking
rate
pressure
rise,
constraining
range.
Additionally,
explores
dilution
expand
mode.
These
insights
provide
valuable
guidance
for
enhancing
operation
hydrogen-fuelled
engines,
facilitating
transition
cleaner
more
efficient
propulsion
systems
transportation.
Case Studies in Thermal Engineering,
Journal Year:
2024,
Volume and Issue:
59, P. 104472 - 104472
Published: April 30, 2024
Diesel
ignition
in-cylinder
direct-injection
methanol
marine
engine
has
shown
enormous
application
potential
due
to
its
superior
fuel
economy
and
lower
carbon
emission.
However,
with
high
vaporization
latent
heat
in
increasingly
strict
emission
regulations,
new
injection
strategy
urgently
need
be
studied
further
improve
the
performance.
To
explore
feasibility
of
achieving
high-efficiency
low-emission
combustion
by
using
pre-injection
a
diesel/methanol
dual
engine,
numerical
investigation
is
conducted
understand
development,
mechanism
forming
unregulated
emissions,
influence
timing
(SOMIpre)
ratio
(MPR)
on
The
results
reveal
that
too
early
SOMIpre
leads
wet
wall,
while
late
insufficient
mixing,
thereby
deteriorating
stability.
optimal
characterizing
an
indicated
thermal
efficiency
(ITE)
49.58%
can
achieved
when
pre-injected
at
35°
crank
angle
(CA)
before
top
dead
center
(BTDC).
As
advances,
peak
pressure
(Pmax),
release
rate
(HRRmax),
mean
effective
(IMEP)
are
decreased,
along
increased
soot,
CO,
HC
emissions
NOX
CO2
remain
essentially
unchanged.
Additionally,
yielded
35°CA
BTDC
MPR
15%
adopting
diesel
(SODI)
20°CA
BTDC,
increasing
ITE
19.9%
2.7%
cutting
19.4%
2.9%
compared
prototype
(pure-diesel
mode)
single-injection
strategy.
this
study
provide
direction
data
support
for
research
development
efficient
clean
engines.
International Journal of Ambient Energy,
Journal Year:
2025,
Volume and Issue:
46(1)
Published: Jan. 8, 2025
Reactivity
Controlled
Compression
Ignition
(RCCI)
adopts
two
kinds
of
fuels;
one
the
strategies
low-temperature
combustion
concepts
has
gained
interest
for
obtaining
lowest
possible
oxides
nitrogen
and
soot
emissions.
The
review
highlights
effects
addition
hydrogen
in
RCCI
mode
engine
operation
to
improve
a
mixture
different
reactivity
fuels
effectively
with
good
fuel
economy.
It
is
being
tried
adopt
single
cetane
enhancers
used
engines.
Hydrogen
results
higher
levels
been
overcome
by
split
injections
exhaust
gas
recirculation.
added
extent
about
50%
energy
share,
embedded
into
hybrid
electric
vehicles
work
under
city
driving
cycle.
Also,
production
onboard
using
ammonia
over
overcoming
handling
storage
problems
green
paves
way
meeting
sustainable
development
goals.
Thus,
it
noted
that
decarbonising
transportation
other
sectors,
use
improved
efficiency
devices
renewable
sources
will
play
key
role
also
net
zero
GHGs
2050.
Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy,
Journal Year:
2024,
Volume and Issue:
238(7), P. 1213 - 1227
Published: July 23, 2024
Researchers
demonstrated
that
implementing
new
combustion
technology
and
optimising
fuel
quantity
results
in
a
significant
reduction
traditional
fossil
usage
emission
levels.
The
Reactivity
Controlled
Compression
Ignition
(RCCI)
strategy
is
one
of
the
low
temperature
technologies,
it
used
to
reduce
overall
while
also
providing
better
control.
This
study
looks
into
RCCI
technology,
which
uses
conventional
diesel
as
high
reactivity
(HRF)
injected
through
injector
acetylene
gas
(LRF)
cylinder
via
modified
inlet
manifold
alongside
air.
engine
setup
was
tested
for
performance,
emissions,
under
various
load
conditions,
well
different
mass
flow
rates
gas,
with
field
at
analysed
using
Computational
Fluid
Dynamics
principle,
determine
best
rate
improving
quality.
According
simulation
results,
optimal
3
Litres
Per
Minute
(LPM),
experimentation
shows
LPM
injection,
brake
thermal
efficiency
(BTE)
improves
by
about
3.2%,
emissions
such
carbon
monoxide
(CO),
hydrocarbon
(HC),
smoke
intensity,
oxides
nitrogen
(NOx)
are
reduced
35%,
17%,
10%,
21%,
respectively.
