中国塑料 ›› 2021, Vol. 35 ›› Issue (11): 125-132.DOI: 10.19491/j.issn.1001-9278.2021.11.019

• 机械与模具 • 上一篇    下一篇

含能材料锥形双螺杆安全混合径向间隙的研究

张峻玮1, 董力群1, 马韵1, 张军2, 薛平1()   

  1. 1.北京化工大学机电工程学院,北京 100029
    2.西安近现代化学研究所,西安 710065
  • 收稿日期:2021-05-22 出版日期:2021-11-26 发布日期:2021-11-23

Study on Safe Mixing Radial Clearance of Conical Twin⁃screw for Extrusion of Energetic Materials

ZHANG Junwei1, DONG Liqun1, MA Yun1, ZHANG Jun2, XUE Ping1()   

  1. 1.College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China
    2.Xian Modern Chemistry Research Institute,Xi'an 710065,China
  • Received:2021-05-22 Online:2021-11-26 Published:2021-11-23
  • Contact: XUE Ping E-mail:xuepmail@263.net

摘要:

以锥形双螺杆挤出机挤出段、过渡体和挤出机头为研究对象,基于Polyflow非等温稳态和瞬态的有限元模拟,对不同径向间隙下流场中各场量分布情况和变化曲线进行分析,研究含能材料在挤出段、过渡体和挤出机头流道中的安全和混合问题。从安全和混合效果两方面考虑,建立了综合评价方法,优选径向间隙。结果表明,最大剪切速率、最高剪切应力和最高黏性耗散热均在挤出段流道入口附近,最高压力在挤出段流道出口处,最高温度在机头处;锥形双螺杆的混合效果随着间隙的增加而增加;在径向间隙为0.5 mm时,流道的安全性能最差,径向间隙为1 mm时,流道的安全性能最好。

关键词: 含能材料, 锥形双螺杆, 径向间隙, 安全性能, 混合效果

Abstract:

Taking the extrusion section, transition body, and extruder head of a conical twin?screw extruder as an research object, the non?isothermal steady?state and transient finite element simulation of Polyflow was conducted to analyze the distributions and change curves of each field in the flow field, their safe mixing issues of energetic materials in the flow channel were studied. Considering both safety performance and mixing effect, a comprehensive evaluation method was established, and the radial clearance was optimized. The results indicated that the maximum shear rate, highest shear stress, and highest viscous heat dissipation of the channel all took place near the entrance of the extruding segment. The highest pressure and temperature were located at the exits of the extruding section flow channel and extruder head, respectively. The mixing effect of the conical twin screw increased with an increase in radial clearance. When the radial gap was 0.5mm, the safety performance of flow channel was the worst. However, the screw exhibited the best safety performance at a radial gap of 1 mm.

Key words: energetic material, conical twin-screw, radial clearance, safety performance, mixing effect

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