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过程工程学报 ›› 2022, Vol. 22 ›› Issue (9): 1253-1261.DOI: 10.12034/j.issn.1009-606X.221310

• 研究论文 • 上一篇    下一篇

平面防冲挡板式分离器冲击区非稳态湍流特性

王学平， 付俊杰， 张玉辉， 龚斌*   

  1. 沈阳化工大学机械与动力工程学院，辽宁 沈阳 110142
  • 收稿日期:2021-09-27 修回日期:2021-11-15 出版日期:2022-09-28 发布日期:2022-10-09
  • 通讯作者: 龚斌 1584043642@qq.com
  • 作者简介:王学平(1973-)，男，辽宁省沈阳市人，博士研究生，研究方向为非均相液液分离，E-mail: 41896545 @qq.com；通讯联系人，龚斌， E-mail: 1584043642@qq.com.
  • 基金资助:
    辽宁省教育厅重点攻关项目

Unsteady turbulence characteristics in impingement region of plane impingement baffle separator

Xueping WANG,  Junjie FU,  Yuhui ZHANG,  Bin GONG*   

  1. School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China
  • Received:2021-09-27 Revised:2021-11-15 Online:2022-09-28 Published:2022-10-09

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摘要： 为了获得较好的液液重力分离器沉降区流场，需要对初始进入的流体进行整流，使其进入分离区前流动平稳均匀。为此将平面防冲挡板改进为整高度矩形挡板，并采用VOF多相流模型对矩形截面分离器冲击区流动特性进行分析。考察了冲击区的喷嘴入口直径(d)、入口至防冲挡板间距(lb)、防冲挡板的宽度(w0)对挡板处和折流板处的速度相对不均匀度(Mf)及平均湍流强度(Iave)的影响。结果表明，综合考虑速度相对不均匀度Mf和平均湍流强度Iave，入口直径取d/w≥0.16较有利(w为沉降器宽度的二分之一)；防冲挡板至入口间距的较佳取值范围为lb/w=0.33~0.53；防冲挡板宽度w0/w≥0.27时效果较好。对折流板处均匀度与湍流强度分别归一化后的相关数值进行统计分析，在分析加权前后的总区间变化率时应优先考虑d/w区间。在d/w区间挡板处与折流板处的湍流强度与均匀度都有较好的线性相关性，随着均匀度增加，湍流强度增加。

关键词: 分离器, VOF模型, 冲击区, 防冲挡板, 不均匀度, 湍流强度

Abstract: The purpose of this work is to acquire the flow field distribution characteristics in the liquid-liquid gravity separator at different geometric dimensions. The flow flield structure of initial incoming fluid needs to be rectified in order to make the fluid more uniform and stable before entering the separation zone of liquid-liquid gravity separator. The flat impingement baffle is improved to the entire height rectangular baffle. A numerical simulation based on the volume of fluid (VOF) method was executed using Ansys Fluent 16.2 to analyze the characteristic of flow flield structure of impacted area caused by rectaugular section. The relative unevenness (Mf) and mean turbulence intensity (Iave) were used to investigate the effect of geometric dimensions in the separator, i.e., the effect of inlet diameter of the nozzle (d), length of the impingement baffle to the inlet (lb) and width of the baffle plate (w0). The results of research showed when relative unevenness and mean turbulence intensity were considered together, the separation of two phase was more favorable with the range of the inlet diameter (d/w) equal or greater than 0.16 (w is half of the width of the liquid-liquid gravity separator), the range of the preferred distance between the baffle and the inlet (lb/w) was from 0.33 to 0.53, and the separation of two phase effect was best when the range of the baffle width (w0/w) was equal or greater than 0.27. After the normalization of the uniformity and turbulence intensity at the baffle plate, the d/w interval should be given priority in analyzing the change rate of the total interval before or after weighting. In addition, there was a good linear correlation between turbulence intensity and uniformity at impingement baffle and baffle plate in the d/w interval, and the turbulence intensity increased with the increase of uniformity.

Key words: separator, VOF model, impingement region, impingement baffle, unevenness, turbulence intensity