基于振荡射流的撞击流反应器混合特性数值模拟

doi:10.16085/j.issn.1000-6613.2025-0087

摘要/Abstract

摘要：

为提高撞击流反应器的混合性能，设计了一种新型自激振荡撞击流反应器，并采用数值模拟方法对其内部流场动力学特征与物质混合过程进行了分析。采用剪切应力输运k-ω（SST）湍流模型模拟了喷嘴内流体流动模式及撞击流反应器内流型分布，考察了雷诺数对射流振荡频率及反应器混合性能的影响。研究结果表明：喷嘴出口射流的振荡是由喷嘴腔室内循环泡的重复生长过程控制，反应器内流场分布受两侧射流偏转角度影响。射流振荡频率随着雷诺数的增大而增加，高频振荡使得两股流体的剪切和径向运动速度加快，雷诺数为30000，混合时间为50s时，反应器出口混合强度达到0.962。本研究拓展了基于振荡射流的撞击流动力学理论体系，为高效反应器设计提供了新思路。

关键词: 撞击流, 振荡射流, 流动特性, 混合性能, 数值模拟

Abstract:

To enhance the mixing performance of the impinging stream reactor, a novel self-excited oscillating impinging jet reactor was designed, and the flow characteristics and mixing performance within this reactor were numerically simulated. The shear stress transport k-‍ω (SST) turbulence model was adopted to simulate the fluid flow pattern within the nozzle and the flow pattern distribution within the impinging stream reactor. The influences of the Reynolds number on the oscillation frequency of the jet and the mixing performance of the reactor were investigated. The research results showed that the oscillation of the jet at the nozzle outlet was controlled by the repetitive growth process of the circulation bubble within the nozzle cavity, and the flow field distribution within the reactor was affected by the deflection angles of the two jets. The oscillation frequency of the jet increased with the increase of the Reynolds number. High-frequency oscillation accelerated the shear and radial movement velocities of the two fluids. When the Reynolds number was 30000 and the mixing time was 50s, the mixing intensity at the outlet reached 0.962. The smaller the difference in the deflection angles of the two jets on both sides of the impinging stream reactor, the faster the mixing speed. The research results enrich the theoretical understanding of the fluid oscillation characteristics of the impinging stream reactor and provide theoretical references for the development of new reactors.

Key words: impinging stream, oscillating jets, flow characteristics, mixing performance, numerical simulation

中图分类号:

TH12

张建伟, 阴苗苗, 董鑫, 冯颖. 基于振荡射流的撞击流反应器混合特性数值模拟[J]. 化工进展, 2025, 44(8): 4488-4499.

ZHANG Jianwei, YIN Miaomiao, DONG Xin, FENG Ying. Numerical simulation of mixing characteristics in an impinging stream reactor based on oscillating jets[J]. Chemical Industry and Engineering Progress, 2025, 44(8): 4488-4499.

图/表 25

图1 自激振荡和传统撞击流反应器结构

图2 自激振荡撞击流反应器喷嘴结构参数

图3 用于对照的反应器结构

图4 网格加密位置及细节

图5 不同网格数轴向压力分布

表1 不同网格数模型左右两侧射流振荡频率

网格数量	左侧射流振荡频率/Hz	右侧射流振荡频率/Hz
506326	4.5192	4.5315
975659	4.5793	4.6248
1266845	4.6325	4.6725
1464181	4.6349	4.6756

图6 不同积分时间下喷嘴内FTLE

图7 喷嘴内流体的向后有限时间李雅普诺夫指数

图8 喷嘴内XOY面流场特性

图9 压力监测面分布

图10 AB两监测面面积加权平均压差的时间序列(a)；FFT频谱分析(b)

图11 CD两监测面面积加权平均压差时间序列(a)；FFT频谱分析(b)

图12 表征射流对撞情况的左右两射流参考信号压差

图13 XOY面不同流型的速度分布云图及流线图

图14 XOZ面不同流型的速度分布云图及流线图

图15 两种流型不同Y值径向截面平均涡量

图16 两种流型不同Z值轴向截面平均涡量

图17 不同喷嘴的撞击流反应器各区域平均涡量分布

表2 不同雷诺数下撞击流反应器两侧射流振荡频率

雷诺数Re	左侧射流振荡频率/Hz	右侧射流振荡频率/Hz
10000	2.6499	2.6499
20000	4.6325	4.6725
30000	6.7877	6.8476

图18 不同雷诺数下表征撞击流反应器对撞情况的左右两射流参考信号压差

图19 入口雷诺数为10000时传统水平对置撞击流反应器XOY面组分分布时间演化云图

图20 入口雷诺数为10000时撞击流反应器XOY面组分分布时间演化云图

图21 入口雷诺数为20000时撞击流反应器XOY面组分分布时间演化云图

图22 入口雷诺数为30000撞击流反应器XOY面组分分布时间演化云图

图23 不同雷诺数下撞击流反应器出口的混合强度指数IM

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