Numerical Analysis of Auto Ignition and Homogeneous Charge Compression Ignition Engine by Using Elementary Reactions
Numerical Analysis of Auto Ignition and Homogeneous Charge Compression Ignition Engine by Using Elementary Reactions
Numerical Analysis of Auto Ignition and Homogeneous Charge Compression Ignition Engine by Using Elementary Reactions
SAE TECHNICAL
SERIES
PAPER
2003-01 -1 090
KElO University
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2003-01-1090
ABSTRACT
INTRODUCTION
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REACTION MECHANISM
In this section, the reaction mechanism Is explained to
helpinthe understanding of the calculation results.
The wel-known basic concept of the n-Butane oxidation
process [12][33][34] iss u m m a r i z e din Figure 1. The
vertical axis shows energy, and the activation energies
are quoted from kojima's scheme [12]. L T R begins with
the breakage of the secondary C-H bond of n-Butanc,
the energy of which is a few k,localories less than other
similar O H bones [35]. Next, 0 2 attaches to a C atom
in place of the abstracted H atom, forming C 4 H 9 0 2 (1st
0 2 addition)
above
850K, the O H
radical is
, providingtemperatures
the chain branching as
Reaction (4) is the main generated
path fromatH 2 0 2low
because its activation energy is smaller than reaction (3).
follows,
RESULTS A N D DISCUSSION
These branching reactions increase the O H radical.
This branched, low temperature oxidation phase
continues until the temperature has increased enough
so that equilibrium in the 1st 0 2 addition and In the 2nd
0 2 , addition reactions ;'1) and (4), begin to shift toward
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Dilution by H O T E G R
The efiect of dilution by H O T E G R on reaction speed
w a s investigated.
The following is the on leu fat ion
procedure with E G R gas.
1. O n e compression / expansion cycle is calculated
under tne condition that the fresh mixture composition is
n-butane: 0 2 : N2: AR: 0 0 2 : H 2 0 - 0.313: 0.2034:
n 7^6- 0 nriQ? n nnn- n nnn (equivalence ratio o=l.C).
initial temperature T 0 being 450K and iho initial pressure
P c being O.IMPa,
2. After exhaust valve open timing,, the burned mixture
is expanded to atmospheric pressure at constant speed.
The temperature of the mixture at thai timing is defined
as the temperature of E G R . E G R gas is composed of
N2. AR. C 0 2 and H 2 0 . The E G R ra:io is cef:ned by the
volume of EGR. gas to the displacement volume.
3. In the next cycle, the fresh mixture's equivalence
ratio and temperature are the s a m e as in the former
cyc^e (c=1.C. T.v - 450K). The irntiai temperature of the
next cycle is calculated by the enthalpy of fresh mixture,
enthalpy of E G R and the E G R ratio. At the s a m e time,
the mixture component for the start of compression :n
the next cycle is calculated from the E G R ratio and the
E G R component.
Figure 5 shows pressure profiles and temperature
profiles at various H O T E G R ratios.
The tmtiai
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increased.
Under =0.41. heat release witn L T R
occurred, H C decreased and C O increased. At much
higher equivalence ratios, heat release with H T R
occurred, and both H C and C O decreased. The s a m e
behavior of emissions in experiment w a s shown in
Figure 12,
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CONCLUSIONS
REFERENCES
knowledge.
980081
2000-01-1832
8.
Najt.
P.M. and Foster, D.E., "Compression-Ignited
Homogeneous Charge Combustion" SAE paper
830264
7.Tosihio
Shudo
and
Yoshitaka
Ono,
"HCCI
AND
REDUCED
CHEMICAL
The
Combustion
12.S. Kojima
Autoignition
FLAME, 99,
1994
87-136,
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17.Takashi
KOYAMA,
Yasumitsu
IBARAGI
and
"A
Fortran
Chemical
Kinetics
30.Private Communications
010327
201-211, 1994
PRACTICALCOMBUSTIONSYSTEM",
Proceedings of Combustion Institute, Vol 28,
pp1 563-1 577, 2000
34.MJ.PILLING"LOW-TEMPERATURE
Furutani,
Masahiko
Kono,
Mitsutaka
CONTACT
Yudai Yamasaki*1 and Norimasa lida*2
2001-01-1029
Department
of
System
Design
Engineering
Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama
223-8522 JAPAN
e-mail*1:y09800@edc.cc.keio.ac.jp
e-mail*2:iida@sd. keio.ac.jp
HP:http://wwwJlda.sd.keio.ac.jp/index2. html