微型撞击流反应器集中了撞击流和微反应器强化混合的双重优点，近年来在微混合和微反应等过程得到广泛应用。目前对微型撞击流反应器的研究多集中在同种流体，结果表明撞击界面的自持振荡是撞击流强化混合的主要机制。对于物性相异的二元粘性流体，撞击界面上将形成分子扩散和粘度梯度等复杂现象，其对界面不稳定性和混合机理的影响尚待揭示。此外，微型撞击流反应器内入流雷诺数通常很小，易出现分离流，混合效果较差。因此，流动调控和混合强化是此类微反应器研究的重点和难点。本项目拟从微型撞击流反应器内二元粘性流体的界面不稳定性入手，揭示界面的振荡机理以及对混合性能的影响机制，通过激励调控撞击面振荡来实现二元粘性流体混合强化。这些研究是对撞击流微反应器相关理论的完善和创新，对高效、可控微型撞击流反应器开发具有十分重要的参考价值。前期在撞击流稳定性及其调控方面取得了一系列创新成果，为完成本课题奠定了很好的基础。

Micro impinging jets reactor has concentrated the dual advantages of mixing enhancement of the impinging stream and micro reactor, and has wide applied to the processes such as micro mixing and micro reactions in recent years. Current researches on the micro impinging stream reactor are mostly focused on the same kind of fluids, and results have shown that the self-sustained oscillation of the impinging interface is the main mechanism of the mixing enhancement of impinging jets. For binary viscous fluids with different properties, complex phenomena such as molecular diffusion and viscosity gradient will be formed in the impingement interface, while their effects on the interface instability and mixing mechanism have not been revealed yet. In addition, for micro impinging jets reactor, the inflow Reynolds numbers are usually very low, and displays a separated flow, and thus the mixing effect is poor. Therefore, the regulating and controlling the flow and mixing enhancement of the binary viscous fluids in micro impinging jets reactor become the emphasis and difficult points of the research. This project will start from the interface instability in the micro impinging jets reactor, and the oscillation rule of the impinging interface and its influence mechanism on the mixing quality will be in-depth studied, the mixing of binary viscous fluids will be intensified through regulation and excitation the oscillation of impingement plane. These studies have remarkable innovations to the theory of impinging streams and micro reactors, and also have very important application values to development of efficient and controllable micro impinging jets reactors. Previous studies on the stability and regulation of impinging jets have made a series of innovation achievements, which lays a good foundation for the completion of this project.