【作者】 郑辰； 张敏弟； 邱思聪； 黎汉生； 王汉伟；

【Author】 Zheng Chen;Zhang MinDi;Qiu SiCong;Wang Hanwei;Beijing Institute of technology;

【机构】 北京理工大学；

【摘要】 针对微反应器内部两相流动提出了一套较为可靠精确的数值模拟方法,并与代理模型相结合对微通道结构进行了优化。采用Level Set多相流模型与VOF多相流模型相结合的CLSVOF模型捕捉了微反应器内部流场气液两相相界面变化过程,描述了CLSVOF模型控制方程的求解过程、相界面追踪以及初始化距离函数等核心步骤,指出了CLSVOF模型通过结合Level Set模型与VOF模型弥补了各单独模型中相界面法向量、曲率计算不准确和距离函数初始化导致的质量不守恒问题,CLSVOF模型在多相流计算中表现出了较高的计算优势。利用CLSVOF模型数值模拟方法与代理模型相结合对微通道喉口尺寸以及挡板长度进行了多参数优化,针对设计变量进行了敏感度分析,探究了不同设计变量对气液混合效率的影响,并预测了最优微反应器结构尺寸,深入探究了气液两相在混合交汇时的非定常流动模式。更多还原

【Abstract】 This investigation is in view of the microreactor internal flow field simulation is put forward a set of more reliable and accurate numerical method, and by using the method of a series of specific micro reactor structure parameter optimization, a CLSVOF model combining the Level Set multiphase flow model and the VOF multiphase flow model was used to capture the gas-liquid two-phase interface of the microreactor internal flow field, the core steps such as control equation solving process, phase interface tracking, and initialization of the model are described in detail. It is pointed out that the CLSVOF model combines the Level Set model with the VOF model to compensate for the quality non-conservation caused by the inaccuracy of the phase interface normal vector, curvature calculation, and distance function initialization in separate single model. It shows a higher computational advantage in multiphase flow calculations,and delves into the gas-liquid two phase in hybrid intersection of unsteady flow dynamic model. The multi-parameter optimization of throat size and baffle length was optimized by Surrogate model calculation. Surrogate model function is used to predict the optimal microreactor structure geometry.更多还原