• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (24): 151-157.

• 论文 • 上一篇    下一篇

卧螺离心机离心分离场速度仿真分析

于萍;林苇;王晓彬;刘京广   

  1. 吉林大学机械科学与工程学院
  • 发布日期:2011-12-20

Velocity Simulation Analysis on Centrifugal Separation Field of Horizontal Spiral Centrifuge

YU Ping;LIN Wei;WANG Xiaobin;LIU Jingguang   

  1. College of Mechanical Science and Engineering, Jilin University
  • Published:2011-12-20

摘要: 针对卧螺离心机理论研究不足而造成的工作时高速堵塞和卡死等恶性事故,应用计算流体动力学(Computational fluid dynamics,CFD)的知识和目前应用较广泛的流体力学软件FLUENT,对卧螺离心机三维立体模型进行网格划分和边界条件设定,通过适当求解得出分离场轴向速度、周向速度和径向速度与结构特性参数之间的相互关系,且在此基础上对离心场中固体颗粒的运动状态进行仿真,得到其运动规律。结果表明,转鼓转动角速度的提高不利于液流的轴向流动,易造成液流滞后值相对升高。通过比较可知,选择50 rad/s的转动角速度最合理;悬浮液固体颗粒体积分数在17%时将达到沉降速度的极限,此时最有利于固液分离。通过对比可知,颗粒沉降时间与理论计算结果基本符合,这为进一步的理论研究和探索奠定了基础。

关键词: 分离场, 固液分离, 速度仿真, 卧螺离心机

Abstract: Computational fluid dynamics knowledge and Fluent software are applied to overcome the jammed malignant accidents. The grid partition and boundary conditions of the 3D model of spiral centrifuge are set by fluent software and the proper solution methods is used to get the relationships between the velocity distributions and the structure characteristic parameters, what’s more, the motion regulations of the solid particles is obtained by the simulations. The results show that the increasing of the drum rotate speed is not conducive to the flow of the axial but the lagged values increase. The rotational speed of 50 rad/s is the best situation by comparison and the setting velocity reaches the highest when the solid particles density is 17%. Particles sedimentation time is consistent with the theoretical calculation by comparison, which is the basic for the further research and explore.

Key words: Horizontal spiral centrifuge, Separation field, Solid-liquid separation, Velocity simulation

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