搅拌反应器内局域多混沌吸引子耦合与流体混合智能强化规律

流体高效节能混合的关键是根据搅拌反应器内流场时空混沌行为，建立与混沌混合相适应的动态调控方法。因缺乏精准控制流体混沌行为和强化规律的研究，限制了智能搅拌反应器的研发与应用。项目拟通过小波分析、分数阶傅里叶变换处理局域流场压力脉动和扭矩信号，分别获取流场局域和整体混沌吸引子及对应的Lyapunov指数。重点研究流场多混沌吸引子和多涡卷混沌吸引子形成与演化机制，模拟流-固耦合运动行为对混合隔离区、混沌区及介稳区流场演化的规律；结合流场观测、计算模拟及图像处理技术，探究搅拌反应器结构参数、操作参数、局域/整体混沌吸引子、流场结构间转化/演化及流体混合能效之间的关系，揭示局域多混沌吸引子的耦合效应、多涡卷吸引子的群集效应与整体混沌混合强化之间的内在联系，构建分数阶智能混沌动态反馈控制系统，形成局域混沌耦合及整体混沌强化的数理模型和操作模式。项目成果可为智能搅拌反应器设计、优化和放大提供理论支持。

To realize fluid mixing with high efficiency and energy saving, it is crucial to establish the corresponding dynamic controlling methods based on tempospatial chaotic performance. Due to the lack of theories on precise controlling for fluid chaotic mixing performance and process intensification methods, the development and application are inhibited for intelligent stirred reactor with high efficiency and energy saving. In this proposal, local and global chaotic attractors be acquired, as well as their corresponding Lyapunov exponents, by treating the pulse signal from flow field with fractal Fourier transformation. Emphasis will be focused on formation, evolution and coupling interaction mechanism of multiple chaotic attractors and multi- scroll chaotic attractors in stirred reactor, and simulation will be carried out on influence of fluid-solid interaction on formation, evolution and interconversion for flow structures of isolated mixing region, chaotic mixing region, and metastable mixing region. With PIV, CFD simulation and imagine processing technology, relationship between structure parameters, operation parameters, chaotic attractors, fluid structure interconversion/ evolution and mixing energy efficiency will be explored for stirred reactors. Internal mechanism between global chaotic intensification and local chaotic effect will be explored, including multiple chaotic attractor coupling effect, cluster effect of multi-scroll chaotic attractor. Fractional intelligent chaotic and dynamic feed-back controlling system will be established to form mathematic model and operational mode for multiple chaotic attractor coupling intensification. Research fruits can supply theoretic support for development and scaleup of intelligent stirred reactor.