第
37
卷第
11
期
2004
年
11
月
天津大学学报
Journal
of
Tianjin
University
计算网格与端流模型对柴油喷雾
多维数值模拟结果的影响*
赵昌普，苏万华
(天津大学内燃机燃烧学国家重点实验室，天津
300072
)
Vo
1.
37 No.11
Nov.
2004
摘
要:为探明柴油喷雾数值模拟的影响因素，用
CFD
多维数值分析软件研究了柴油喷雾的油束特性.计算结果
表明，网格的划分直接影响计算结果的正确性和油束的几何形状.建立计算网格时，要注意网格均匀一致，避免网
格密度突变;特殊几何形状壁面附近局部贴休坐标网格的范围不宜太大，否则会引起计算结果的畸变.对不同捕流
模型的计算试验发现，
RNG
K-8
淌流模型计算精度高、成本低，适合于柴油机缸内喷雾的数值模拟.
关键词:柴油机;喷雾特性;计算网格;淌流模型;数值模拟
中图分类号
TK421.43
文献标志码
:A
文章编号
0493-2137(2004)11-0965-05
Effects of the Computation Mesh
and
Turbulence Model on
Multi-Dimensional Numerical Simulation Results of a Diesel Spray
ZHAO
Chang-pu
,
SU
Wan-hua
(State
Key
Laboratory
of
Engines , Tianjin U niversity, Tianjin 300072, China)
Abstract:
In
order
to try to find out
the
influence factors of
numerical
simulation results of a diesel spray,
the
diesel spray
characteristics
were investigated by a computational fluid dynamics (
CFD)
multi -dimensional
nu-
merical analysis code.
The
simulation results showed
that
computation
meshes
directly
influenced
the
correct-
ness
of computational results
and
the
geometric
shape
of a spray.
It
is very important to
keep
the
computation
mesh
even
and
consistent
and
to avoid
the
sudden
changes
of mesh density when constructing computation me-
shes.
The
range of local body-fitting coordinate
mesh
adjacent
to
the
wall with
special
geomet
叮
should
not
be
too wide or
extended
, or it would
cause
the
aberration of computational results.
The
computational experiment
with different
turbulence
models
applied
to
the
diesel spray simulation
in
the
bump
combustion
chamber
proved
that
RNG
K-8
model
had
higher
computational
accuracy
and
shorter
CPU
time
and
was
appropriate
for
the
in-
cylinder
spray
numerical
simulation of diesel engines.
Keywords:
diesel
engine;
spray
characteristics;
computation
mesh;
turbulence
model;
numerical
simulation
内燃机缸内气流运动、喷雾及燃烧过程的改善是
降低排放和改善柴油机性能的重要方面，数值模拟是
揭示其详细物理过程的重要手段.因数值模拟具有成
本低、速度快、资料完备以及模拟真实条件和理想条件
*收稿日期
:2003-07-07;
修同日期:
2004- 04-
07.
的能力，其应用
H
益广泛
[1
- 5
]计算结果取决于计算网
格及数学模型，因此，探索计算网格与端流模型对喷雾
计算结果的影响，能够合理建立计算网格、使用端流模
型，并能够准确预报柴油机喷雾混合过程.
基金项目:国家重点基础研究发展规划基金资助项目(
2001
C
B209202
)
;国家自然科学基金重点资助项目
(59936130)
.
作者简介:赵日普
(1964
一
)
，男，博士，副教授，
chpzhao@
eyou. com.
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