Abstract: This paper introduced the experimental researches on mixing time of jet mixers, overviewed the applications of CFD technologies in the evaluation of mixing efficiency and flow field structure, and summarized the correlations for mixing time proposed by different researchers. By analyzing the effect of parameters on jet mixing efficiency, it was found that mixing time increased with the increasing of tank diameter and was proportional to the height of tank. The increasing of jet velocity can effectively reduce the mixing time. The optimum diameter and shape of jet nozzles were decided by the concrete structures of jet mixers, but the optimum position of jet nozzle depended on the height-to-diameter ratio of tank. Multiple opposed jets can improve the mixing efficiency obviously. This research indicated that the research and development process of jet mixing enhancement mechanism and novel jet mixing reactor can effectively promoted by combining CFD methods with experimental methods such as pressure fluctuation signal (PFS), PIV and PLIF technology.

Key words: jet mixing, mixing time, design parameters, CFD

摘要： 介绍了有关射流混合设备内混合时间的实验研究进展，概述了计算流体力学（CFD）技术在射流混合设备内流场结构演化和混合效率评价中的应用，总结了不同研究者提出的混合时间关联式。分析影响射流混合效率的参数发现：混合时间随着混合槽直径的增加而增加，并与混合槽的高度呈正比；射流速度的增加可有效地降低混合时间；射流喷嘴的最佳直径与形状由混合槽的具体结构决定，但其最佳位置取决于混合槽高度与直径的比值；多股对置射流明显地提高混合效率。最后指出将CFD方法与压力波动信号（PFS）、PIV和PLIF等实验方法相结合可有效地推进射流强化混合机理研究和新型射流混合反应器的开发进程。

关键词: 射流混合, 混合时间, 设计参数, 计算流体力学