第
32
卷第
10
期
2011
年
10
月
哈尔滨工程大学学报
Joumal
of
Harbin
Enginee
创
nn
doi: lO. 3969/j. issn.1006
-7043.201
1. 10.018
同向锥形双螺杆混合挤出性能的比较
曹英寒
1
,
2
陈晋南
l
Vo
l.
32
NQ.
10
Oc
t.
2011
(
1.北京理工大学化工与环境学院,北京
100081;
2.
南
F
日理工学院生物与化学工程学院,河南南阳
473004
)
摘
要:为了给同向锥形双螺杆的设计和实际加工提供理论依据和技术支持,在螺杆转速为
25r/min
,进出口压差为零的
条件下,使用
POLYFLOW
软件,数值模拟了同向和异向旋转锥形双螺杆、平行同向双螺杆
i
昆合挤出
RPVC
的过程,计算
了
3
种双螺杆计量段流道内熔体的三维等温流场,用粒子示踪法统计分析了
3
种双螺杆的
i
昆合挤出性能,将同向锥形双
螺杆的提合挤出性能与异向锥形双螺杆和平行双螺杆的
i
昆合挤出性能比较.统计分析结果表明,同向锥形双螺杆分散性
i
昆合能力最大,分布性提合能力比异向锥形的大,比平行双螺杆的小.同向锥形双螺杆既保存了异向锥形双螺杆有利于
物料的压缩的优点,又克服了异向锥形双螺杆剪切能力小的缺点.锥形双螺杆计量段流道内熔体的压力波动最小,有利
于挤出制品的稳定性.用实验和数值计算
2
种方法研究了
HT-30
平行双螺杆挤出
RPVC
的停留时间,验证了所采用的数
值计算方法的可靠性.
关键词:数值模拟,粒子示踪法,同向锥形双螺杆,提合挤出
中图分类号
:TQ320.66
文献标识码
:A
文章编号:
1006-7043(
2011
)10-1360-07
Study
on
the
皿对
ng
performance of a
ω-rota
位电
COnilωI
佣归
-screw
extruder
CAO
Yinghan
1
,2 ,
CHEN
linnan
1
( 1.
School
of
Chemical Engineering and Environment , Beijing Institute
of
Technology
, Beijing
100081
, China; 2.
School
of
Biology
and
Chemical Engineeing
,
Nanyang
Institute
of
Technology
,
Nanyang
473004 ,
China
)
Abstract:
In
order
to provide
theoretical
basis
and
technical
support
for
the
design
and
actual
processing
of
a co-ro-
tating
conical
twin-screw , a
study
was
done
on
the
mixing
perfonnance
of
a co-rotating
conical
twin-screw
extrude
r.
The
flow
of
rigid polyvinyl
chloride
( RPVC ) was
melted
in
a
co-rotating
conical
twin-screw
extrude
r.
When
the
ro-
tation
speed
was 25
r/min
,
the
pressure
difference
between
the
entrance
and
exit
of
the
extruder
was zero , a co-ro-
tating
conical
twin-screw
extruder
, a
counter-rotating
conical
twin-screw
extruder
and
a
parallel
twin-screw
extruder
were
simulated
by
using
Polyflow-the finite
element
method
software.
The
three-dimensional
isothennal
flow fields
of
RPVC
in
the
melting sections
of
the
three
types
of
twin-screw
extruders
were also
calculated.
The
mixing
perfonn-
ance
of
each
type
of
twin-screw
extruder
was
studied
by
using
the
particle
tracking
analysis
method.
The
results
of
particle
tracking
analysis
show
that
a
co-rotating
conical
twin-screw
extruder
has
the
best
di
叩凹
'sive
mixing
perfonn-
ance.
It
s
distribution
mixing
perfonnance
is
better
than
that
of
a
counter-rotating
conical
twin-screw
extruder
and
smaller
than
that of a parallel twin-screw extrude
r.
The
results show that a co-rotating conical twin-screw extruder not on-
ly
hωthe
advantage of compressing materials ,
but
also overcomes
the
shortcoming of a lower
shear
rate compared with a
counter-rotating conical twin-screw extrude
r.
Th
e fluctuation of pressure
in
the
melting section of a co-rotating conical
twin-screw extruder is
the
smalle
歧,
which allows for superior stability
of
the polymer extrusion
in
the
three types of twin-
screwextruders.
The
residence time of RPVC
in
an
HT-30 combined parallel twin-screw extruder was studied through ex-
periments
and
numerical
simulation.
咀
le
difference
in
results between the two methods was
ve
可
small.
咀
lerefore
,
the
mathematical
and
physical models as well
as
the numerical method
in
this study
are
reliable.
Ke
Y'席
or
由
:numerical
simulation; particle tracking analysis; co-rotating conical twin-screw extruder; mixing extrusion
收稿日期
2011-04-18
基金项目科研协作基金资助项目
B2220080256
)
作者简介:曹英寒(
1982-)
,女,博士;
陈晋南(
1948
斗,女,教授,博士生导师,
E-mail:jnchen@
bi
t.
edu.
cn.
通信作者陈晋南
随着聚合物加工业的发展,聚合物主要加工设
备双螺杆挤出机得到了飞速发展,以其优异的加工
性能得到了越来越广泛的应用
.1967
年左右,奥地
利
ANCER
兄弟公司制造出世界上第一台异向锥形