华南理工大学学报(自然科学版) ›› 2009, Vol. 37 ›› Issue (4): 57-60.

• 机械工程 • 上一篇    下一篇

螺旋芯棒式吹膜模头熔体流动特性的数值模拟

麻向军 童玉宝 何和智 瞿金平   

  1. 华南理工大学 聚合物新型成型装备国家工程研究中心, 广东 广州 510640
  • 收稿日期:2008-04-03 修回日期:2008-06-25 出版日期:2009-04-25 发布日期:2009-04-25
  • 通信作者: 麻向军(1966-),男,博士,副教授,主要从事材料成型过程的数值模拟研究. E-mail:xjma@scut.edu.cn
  • 作者简介:麻向军(1966-),男,博士,副教授,主要从事材料成型过程的数值模拟研究.
  • 基金资助:

    国家自然科学基金资助项目(10590351)

Numerical Simulation of Melt Flow Characteristics in Spiral Mandrel Die for Blown Film

Ma Xiang-jun  Tong Yu-bao  He He-zhi  Qu Jin-ping   

  1. National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology,, Guangzhou 510640, Guangdong, China
  • Received:2008-04-03 Revised:2008-06-25 Online:2009-04-25 Published:2009-04-25
  • Contact: 麻向军(1966-),男,博士,副教授,主要从事材料成型过程的数值模拟研究. E-mail:xjma@scut.edu.cn
  • About author:麻向军(1966-),男,博士,副教授,主要从事材料成型过程的数值模拟研究.
  • Supported by:

    国家自然科学基金资助项目(10590351)

摘要: 为了研究吹塑薄膜螺旋芯棒式模头内熔体的流动特性,采用计算流体力学(CFD)方法.利用Polyflow软件对熔体的流场进行了三维数值模拟.结果表明:随着螺槽的逐渐消退,螺槽内熔体由入口处的沿螺槽方向流动逐渐变为沿模头轴向流动;而环形间隙内熔体的速度在入口处存在较小的环向分量,随间隙厚度的增加逐渐变为沿轴向流动;沿挤出方向,螺槽中熔体的等压线由垂直于螺槽逐渐变为垂直于轴向,环形间隙中熔体的等压线由倾斜于轴向逐渐变为垂直于轴向.

关键词: 螺旋芯棒式模头, 流场, 等压线, 数值模拟

Abstract:

In order to reveal the flow characteristics of melt in spiral mandrel die for blown film, the melt flow field is investigated via a 3D numerical simulation using the CFD software Polyflow. The results show that ( 1 ) with the gradual fadeaway of spiral groove, the flow direction of the melt in spiral groove changes from the one along the spiral groove into the one along the mandrel axis; (2) though there exists a small circumferential velocity component in the initial area, the melt in annulus clearance mainly flows along the mandrel axis with the increase of clearance thickness ; and (3) the isobar of the melt in groove perpendicular to the groove becomes perpendicular to the mandrel axis, while that in annulus clearance inclining to the mandrel axis becomes perpendicular to the mandrel axis.

Key words: spiral mandrel die, flow field, isobar, numerical simulation