泰勒反应器中瞬态波状涡流场的CFD数值模拟

doi:10.16085/j.issn.1000-6613.2020-2402

化工进展 ›› 2021, Vol. 40 ›› Issue (11): 6009-6018.DOI: 10.16085/j.issn.1000-6613.2020-2402

泰勒反应器中瞬态波状涡流场的CFD数值模拟

杨航¹(), 杨晓勇¹, 白志山¹(), 汪营磊², 高福磊²

^1.华东理工大学机械与动力工程学院，上海 200237
^2.西安近代化学研究所，陕西西安 710000

收稿日期:2020-11-29 修回日期:2021-01-31 出版日期:2021-11-05 发布日期:2021-11-19
通讯作者: 白志山
作者简介:杨航（1997—），男，硕士研究生，研究方向为旋转流场的流体力学行为。E-mail：17773044259@163.com。
基金资助:
国家自然科学基金(22078102);上海市科委重点项目(19DZ1208200)

CFD simulation of transient velocity filed for wavy vortex flow in a Taylor reactor

YANG Hang¹(), YANG Xiaoyong¹, BAI Zhishan¹(), WANG Yinglei², GAO Fulei²

^1.School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
^2.Xi’an Modern Chemistry Research Institute, Xi’an 710000, Shaanxi, China

Received:2020-11-29 Revised:2021-01-31 Online:2021-11-05 Published:2021-11-19
Contact: BAI Zhishan

摘要/Abstract

摘要：

泰勒反应器中的波状涡流因存在周向波和涡间传质而受到广泛关注。本文针对泰勒反应器（半径比为0.83，纵横比为46.07）中的波状涡流进行了数值模拟研究，采用计算流体力学（CFD）软件研究了无轴向流动和有轴向流动时的两种流场。结果表明，数值模拟与文献中的PIV实验结果具有较好的一致性。在波状涡流场中，周向波动的存在消除了涡的轴对称性，导致涡随周向位置的周期性变化，包括涡的形状、位置以及涡量等，这也引起了速度的瞬态行为。轴流的引入降低了涡的周期性变化程度，改变了速度的瞬时特性，也稳定了流场。同时还发现轴向流动也影响着切向速度随时间的变化，切向速度随漩涡通过频率及其高次谐波而振荡。

关键词: 泰勒反应器, 周向波动, 波高, 波谱, 涡量

Abstract:

The wavy vortex in the Taylor reactor has received widespread attention due to the existence of azimuthal waves and mass transfer between adjacent vortices. In the present study, a numerical study was developed for the wavy vortex flow in a Taylor reactor, of which the radius ratio was 0.83 and the aspect ratio was 46.07. Computational fluid dynamics (CFD) was utilized to investigate the flow field without and with an axial flow. The numerical predictions were compared favorable to the PIV measurements in the literature. The results suggested the azimuthal waves eliminated the axisymmetric of vortex structure, and resulted in the periodic variation of the vortex with the azimuthal position, including the vortex shape, position, and vortex vorticity. It also yielded the transient behavior of velocity. The introduction of an axial flow decreased the degree of the above periodic variation with the azimuthal position, changed the variation of the velocity with time, and stabilizes a more stable flow field. It was found the axial flow also affected the variation of tangential velocity with the time. The unsteady tangential velocity fluctuated with the vortex passage frequency and its higher harmonics.

Key words: Taylor reactor, azimuthal waves, wave height, wave spectra, vorticity

中图分类号:

TQ051.7

杨航, 杨晓勇, 白志山, 汪营磊, 高福磊. 泰勒反应器中瞬态波状涡流场的CFD数值模拟[J]. 化工进展, 2021, 40(11): 6009-6018.

YANG Hang, YANG Xiaoyong, BAI Zhishan, WANG Yinglei, GAO Fulei. CFD simulation of transient velocity filed for wavy vortex flow in a Taylor reactor[J]. Chemical Industry and Engineering Progress, 2021, 40(11): 6009-6018.

图/表 20

图1 泰勒反应器结构

图2 模型网格划分和局部放大

表1 网格方案

方案	轴向	周向	径向	网格总数
网格1	200	160	10	360714
网格2	300	240	15	1562470
网格3	500	280	24	3521426
网格4	600	360	30	6730758

图3 切向速度分布（Ta=124，Re=0）

图4 不同周向位置子午面上的速度场和涡量场（Ta=139）

图5 速度分量分布（Ta=139）

图6 不同周向位置涡流的最大涡量（Ta=139）

图7 不同Ta时部分中心柱面上的切向速度

图8 不同Ta时中心柱面上的波高和波数

图9 波高对涡变形程度的影响（m=2）

图10 不同轴向位置纬向环面上的切向速度（ζ＝Z/d）

图11 切向速度波动波谱

图12 速度矢量图（Ta=139, Re=5）

表2 不同流动条件下涡对的波长λ

泰勒数	雷诺数	波长λ		流型
泰勒数	雷诺数	实验结果	模拟结果	流型
123	5.3	1.76d	1.75d	非波状层流涡流
131	1.6	1.82d	1.85d	波状涡流
139	5.0	1.70d	1.71d	波状涡流

图13 不同周向位置子午面上的速度场和涡量场（Ta=139）

图14 速度分量分布（Ta=139，Re=5）

图15 顺时针涡（V2）的最大涡量（Ta=139，Re=5）

图16 不同雷诺数时环隙中心柱面上的切向速度（Re=2.5和5.0）

图17 不同Re周向波波高

图18 切向速度波动的波谱

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泰勒反应器中瞬态波状涡流场的CFD数值模拟

CFD simulation of transient velocity filed for wavy vortex flow in a Taylor reactor

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