第
39
卷第
1
期
西安交通大学学报
Vo
l.
39
NQ1
2005
年
1
月
JOURNAL
OF
XI'
AN
JIAOTONG
UNIVERSITY
]an.
2005
用特征时间燃烧模型模拟直喷式柴油机的燃烧
黄勇成，周龙保
(西安交通大学能源与动力工程学院，
710049
，西安)
摘要:为了更好地模拟直喷式柴油机的喷雾及燃烧过程，对
Kiva-3
程序的喷雾和燃烧模型进行了改进，引
入
Kelvin-
Helmholtz
和
Rayleigh-
Taylor
模型来模拟油滴破碎过程，采用改进的
Shell
自燃模型来模拟着火
过程，为了综合考虑化学动力学和端流对燃烧的影响，采用层流和瑞流多重特征时间尺度燃烧模型来模拟燃
烧过程.计算结果表明:在不同工况下计算所得的缸内压力、滞燃期和燃烧放热速率与实验结果吻合良好，着
火点位于油束下游当量比略小于
1
的稀混合气区域
p
用改进的
Kiva-3
程序可以较好地研究直喷式柴油机的
喷雾和燃烧过程，为进一步利用三维数值模拟计算来指导直喷式柴油机的参数优化奠定了基础.
关键词=特征时间燃烧模型;数值模拟;直喷式柴油机
中图分类号
TK42
文献标识码
A
文章编号:
0253-987X(200
日
01
-0
026-05
Multidimensional Numerical Simulation
of
Direct Inject Diesel Engine
Combustion via Characteristic Time Combustion Model
Huang
Yongcheng
,
Zhou
Longbao
(Sc
h
∞
1
of Energy
and
Power Engineering, Xi' an Jiaotong University,
Xi'
an
710049.
China)
Abstract: Numerical simulations
of
direct injection diesel engine combustion
at
different engine operating
conditions were conducted using
the
Kiva-3 code.
The
spray
and combustion models
of
the
code were modi-
fied.
In
the
modification, Kelvin-Helmholtz and Rayleigh-
Taylor
model was applied
to
describe
the
break-
up process
of
injection
spray
and
the
improved Shell
aut
o-
ignition model was adopted
to
simulate
the
igni-
tion process.
In
addition,
the
post-ignition combustion simulation
was
performed
with
a multiple laminar
and
turbulent
characteristic timescale combustion model for taking into account
the
effects
of
both
turbu-
lence and chemical kinetic
on
combustio
n.
The
predicted values were compared
with
the
engine testing da-
ta.
The
results
calculated
show
good agreement
with
experimental
results
in cylinder pressure, in ignition
delay period
, and in
heat
release.
The
ignition site is located
at
the
lower reaches
of
spray
where
the
equiv-
alent ratio
of
ai
r-
fuel
mixture
is slightly less
than
one.
The
modified Kiva-3 code could successfully predict
the
essential features
of
spray
ignition and combustion processes.
This
work
laid
the
foundation for optimi-
zing
the
system
parameters
of
direct injection diesel engines using multidimensional numerical simulations.
Keywords:
characteristic
time
combustion
model;
numerical
simulation;
direct
injection
diesel
engine
随着计算机技术的飞速发展，柴油机缸内过程
三维数值模拟在预测柴油机性能、指导燃烧系统设
计等方面发挥了前所未有的作用.它可以代替部分
发动机试验，在设计初期进行参数优选，从而大大缩
短柴油机的研制周期，降低开发成本.在直喷式柴油
机三维模拟计算方面，已开展了大量的研究工作，取
得了较多的成果，并已将研究成果应用于产品改造
中
[1]
为了更好地模拟直喷式柴油机的喷雾及燃烧
过程，本文对内燃机行业中应用广泛的
kiva-3
程
序田中的喷雾及燃烧模型进行了改进，引入了新的
收稿日期:
2004
白
06-24.
作者简介
2
黄勇成(1
973-)
，男，博士，副教授.
基金项目:国家自然科学基金资助项目
(50306020).
资源评论
