东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (5): 729-735.DOI: 10.12068/j.issn.1005-3026.2020.05.020

• 材料与冶金 • 上一篇    下一篇

数值模拟喷射夹角对VIGA制粉雾化过程的影响

郭快快, 陈进, 刘常升, 陈岁元   

  1. (东北大学 材料科学与工程学院, 辽宁 沈阳110819)
  • 收稿日期:2019-11-19 修回日期:2019-11-19 出版日期:2020-05-15 发布日期:2020-05-15
  • 通讯作者: 郭快快
  • 作者简介:郭快快(1989-),男,河南平顶山人,东北大学博士研究生; 刘常升(1963-),男,内蒙古奈曼旗人,东北大学教授,博士生导师; 陈岁元(1964-),男,甘肃天水人,东北大学教授,博士生导师.
  • 基金资助:

    国家重点基础研发计划项目(2017YFB0305801); 国家自然科学基金-辽宁联合基金重点资助项目(U1508213); 国家自然科学基金资助项目(51771051).

Numerical Simulation of the Intersection Angle Influence on Atomization Process of Powders Produced by VIGA

GUO Kuai-kuai, CHEN Jin, LIU Chang-sheng, CHEN Sui-yuan   

  1. School of Materials Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2019-11-19 Revised:2019-11-19 Online:2020-05-15 Published:2020-05-15
  • Contact: LIU Chang-sheng
  • About author:-
  • Supported by:

    -

摘要:

通过计算流体力学软件数值模拟和实验相结合的方法,以高温合金雾化过程中气、液、固三相的交互作用机制为研究对象,采用欧拉-拉格朗日法的VOF(volume of fluid)多相流模型和DPM(discrete phase model) 离散相方法,研究了喷射夹角对熔体主雾化和二次雾化过程TAB(Taylor analogy breakup)破碎过程和粒度分布的影响,并与同步实验结果进行了对比.研究结果表明,随着喷射夹角的增大,回流区面积逐渐减小.金属熔体的初次破碎形态呈“倒喷泉状→伞状”,初次液滴的尺寸为0.3~0.9mm.初次破碎液滴的气体韦伯数(We)为10~90,随喷射夹角的增大,粉末的平均粒径逐渐降低,喷射夹角为36°时,实验制备的粉末粒径与数值模拟得到的粉末粒径基本一致,表明了数值模拟合金雾化破碎过程的合理性.

关键词: 真空感应熔炼气雾化(VIGA), 主雾化和二次雾化, 喷射夹角, 流场结构, 粒度分布

Abstract:

The effect of intersection angle on the primary and secondary atomization of vacuum induction melting gas atomization (VIGA) was studied by the combination of experiments and computational fluid dynamics CFD simulations. The VOF (volume of fluid) multiphase flow model based on the Euler-Lagrange method was used to simulate the primary atomization process and the discrete phase model (DPM) was used to simulate the breakup process and predict the particle size distribution (PSD) of Taylor analogy breakup (TAB) in secondary atomization. The results show that the simulated area of recirculation zone decreases with the increase of intersection angle. The fragmentation morphology of metal melt is presented as "fountain→umbrella" and the primary droplets size is 0.3~0.9mm. The Weber number (We) of liquid droplets is 10~90. With increasing intersection angle, the average particle size of the powders decreases gradually. Moreover, these simulation results prove reasonable, which the simulated particle size of the powders is in agreement with the experimental one when the intersection angle is 36°.

Key words: vacuum induction melting gas atomization (VIGA), primary and secondary atomization, intersection angle, flow field structure, particle size distribution

中图分类号: