浸没式撞击流反应器流场涡特性的数值研究

doi:10.11949/0438-1157.20220277

摘要/Abstract

摘要：

利用大涡模拟（LES）方法研究了撞击流反应器内流场涡特性，分析撞击区域流体流动特征。改变进口速度、喷嘴间距，讨论流场速度、涡量和平面涡能量分布规律，并分析了流场流型、涡演化过程和涡核形式。在反应器内靠近撞击驻点的涡尺寸小、脉动性高，随着撞击距离的增加，流体速度逐渐减小，涡影响范围变大。平均涡量和平均涡能量随进口速度的增加，先增加后减小。结合Q判据分析了反应器内涡的演化过程和流体流型。根据径向射流涡的演变过程，得到径向射流两侧涡演化的周期，在0.15~0.20 s之间。撞击区的涡结构主要为马蹄涡和肋状涡，在出口位置存在涡环。研究结果为深入分析撞击流反应器流体运动规律和优化反应器提供了理论参考。

关键词: 撞击流, 数值模拟, 湍流, 涡结构, 流型, 流体力学

Abstract:

The large eddy simulation (LES) method was used to study the vortex characteristics in impinging stream reactor, and the fluid flow characteristics in the impact area were analyzed. The distribution of flow field velocity, vorticity magnitude and the average plane vortex energy was studied by changing inlet velocity and nozzle spacing. The flow regime, vortex evolution process and vortex core form were analyzed. The vortex striking near the stagnation point in the reactor had small size and high pulsation. With the increased of impact distance, the fluid velocity magnitude gradually decreased and the influence range of vortex became larger. The average vorticity magnitude and the average vortex plane energy first increased and then decreased with the increased of inlet velocity. The vortex evolution process and the flow regime in the reactor were analyzed based on Q criterion. According to the vortex evolution process of radial jet, the evolution period of vortex on both sides of radial jet was obtained, which was between 0.15 s and 0.20 s. The vortex structures in the impact zone were horseshoe vortex and ribbed vortex, and there was a vortex ring at the outlet. The research results provide a theoretical reference for the in-depth analysis of the fluid motion law of the impingement flow reactor and optimization of the reactor.

Key words: impinging stream, numerical simulation, turbulent flow, vortex structure, flow regime, fluid mechanics

中图分类号:

TQ 027.1

张建伟, 高伟峰, 董鑫, 冯颖. 浸没式撞击流反应器流场涡特性的数值研究[J]. 化工学报, 2022, 73(8): 3553-3564.

Jianwei ZHANG, Weifeng GAO, Xin DONG, Ying FENG. Numerical study on vortex characteristics in submerged impinging stream reactor[J]. CIESC Journal, 2022, 73(8): 3553-3564.

图/表 18

图1 撞击流反应器几何模型

Fig.1 Geometric model of impinging stream reactor

图2 网格无关性检验

Fig.2 Grid independence test

图3 撞击流反应器实验示意图1—撞击流反应器;2—电磁流量计;3—阀门;4—离心泵;5—进料桶;6—出料桶;7—示踪剂;8—蠕动泵;9—激光发射器;10—激光控制器;11—同步器;12—计算机;13—CCD摄像机

Fig.3 Schematic diagram of impinging stream reactor experiment1—impinging stream reactor; 2—electromagnetic flowmeter; 3—valve; 4—centrifugal pump; 5—feed bucket; 6—discharge bucket; 7—tracer; 8—peristaltic pump; 9—laser transmitter; 10—laser controller;11—synchronizer; 12—computer; 13—CCD camera

图4 实验与模拟径向速度对比

Fig.4 Comparison of experimental and simulated radial velocity

图5 不同轴向位置流线图

Fig.5 Streamline of different axial positions

图6 流场平均涡量对比

Fig.6 Comparison of mean vorticity in flow field

图7 径向涡量分布

Fig.7 Radial vorticity magnitude distribution

图8 Y/D=1涡量分布

Fig.8 Vorticity magnitude distribution at Y/D=1

图9 撞击流反应器涡量等值面

Fig.9 Vorticity magnitude of iso-surface of impinging stream reactor

图10 不同位置涡量分布曲线

Fig.10 Vorticity magnitude distribution curve at different positions

图11 不同工况下流场平均涡能量

Fig.11 Q¯of flow field under different working conditions

图12 撞击区域的涡核分布

Fig.12 Vortex core distribution in impact region

图13 XOZ面涡演化过程示意图

Fig.13 Schematic diagram of the vortex evolution of XOZ surface process

图14 XOY面涡径向运动时间

Fig.14 Radial movement time of vortex under XOY surface

图15 XOY面涡径向分离时间

Fig.15 Radial separation time of vortex under XOY surface

图16 XOY面涡周向运动时间

Fig.16 Peripheral motion time of vortex under XOY surface

图17 涡周期性演化示意图

Fig.17 Schematic diagram of vortex periodic evolution

表1 撞击流反应器不同L/D和tc关系

Table 1 Comparison of L/D and tc of impinging stream reactor

L/D	t_c/s
1	18
3	20
5	15

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