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SHOCK-TUBE INVESTIGATION OF IGNITION DELAY TIMES OF BLENDS OF METHANE AND ETHANE WITH OXYGEN
Access this item.
Title
SHOCK-TUBE
INVESTIGATION
OF
IGNITION
DELAY
TIMES
OF
BLENDS
OF
METHANE
AND
ETHANE
WITH
OXYGEN
Author
Walker, Brian Christopher
Keywords
methane
ethane
combustion
ignition delay
shock-tube
Abstract
The
combustion
behavior
of
methane
and
ethane
is
important
to the
study
of
natural
gas
and
other
alternative
fuels
that are
comprised
primarily
of these
two
basic
hydrocarbons.
Understanding
the
transition
from
methane-dominated
ignition
kinetics
to
ethane-dominated
kinetics
for
increasing
levels
of
ethane
is
also of
fundamental
interest
toward
the
understanding
of
hydrocarbon
chemical
kinetics.
Much
research
has been
conducted
on the
two
fuels
individually
, but
experimental
data
of the
combustion
of
blends
of
methane
and
ethane
is
limited
to
ratios
that
recreate
typical
natural
gas
compositions
(up
to
~20%
ethane
molar
concentration).
The
goal
of this
study
was to
provide
a
comprehensive
data
set
of
ignition
delay
times
of the
combustion
of
blends
of
methane
and
ethane
at
near
atmospheric
pressure.
A
group
of
ten
diluted
CH4/C2H6/O2/Ar
mixtures
of
varying
concentrations
,
fuel
blend
ratios
, and
equivalence
ratios
(0.5
and
1.0)
were
studied
over
the
temperature
range
1223
to
2248
K
and
over
the
pressure
range
0.65
to
1.42
atm
using
a
new
shock
tube
at the
University
of
Central
Florida
Gas
Dynamics
Laboratory.
Mixtures
were
diluted
with
either
75
or
98%
argon
by
volume.
The
fuel
blend
ratio
was
varied
between
100%
CH4
and
100%
C2H6.
Reaction
progress
was
monitored
by
observing
chemiluminescence
emission
from
CH*
at
431
nm
and the
pressure.
Experimental
data
were
compared
against
three
detailed
chemical
kinetics
mechanisms.
Model
predictions
of
CH*
emission
profiles
and
derived
ignition
delay
times
were
plotted
against
the
experimental
data.
The
models
agree
well
with the
experimental
data
for
mixtures
with
low
levels
of
ethane
,
up
to
25%
molar
concentration
, but
show
increasing
error
as the
relative
ethane
fuel
concentration
increases.
The
predictions
of the
separate
models
also
diverge
from
each
other
with
increasing
relative
ethane
fuel
concentration.
Therefore
, the
data
set
obtained
from the
present
work
provides
valuable
information
for the
future
improvement
of
chemical
kinetics
models
for
ethane
combustion.
Adviser
Petersen, Eric
Publisher
University
of
Central
Florida
Degree
M.S.A.E.
Degree Discipline
Department of Mechanical, Materials and Aerospace Engineering
Degree Grantor
Engineering and Computer Science
Degree Program
Aerospace Engineering MSAE
Graduation Date
2007-12-01
Type
Master's thesis
Access Level
Public - Allow Worldwide Access
Release Date
2007-12-01
Repository
University Archives
Repository Collection
Electronic Theses and Dissertations
Identifier
CFE0001956
Access Link
http://purl.fcla.edu/fcla/etd/CFE0001956
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