基于无网格法催化转化器的热流声耦合分析及多尺度优化研究

本项目针对催化转化器效率低、噪声大和寿命短等问题，结合无网格法和拓扑优化理论，开展催化转化器热流声耦合化学反应的性能分析和多场耦合载体的超材料-微结构多尺度拓扑优化研究，以减少尾气排放和环境污染。通过构造微通道接触面上的无网格法影响域、插值函数和映射算法，阐明催化转化器传热、流动、声学与化学反应多场耦合机理，并建立热流声与化学反应强耦合分析的全真数值模型和GPU并行算法；构建细观单胞热力声性能的宏观等效表征方法，揭示非规则宏观载体微通道和细观单胞微构型对催化转化器综合性能的影响机制，并基于双负材料属性参数建立催化转化器载体的超材料-微结构多尺度一体化拓扑优化模型；根据试验结果修正模型，基于材料与结构协同优化思想，建立多目标优化函数，并结合宏观布局和细观精细设计技术，实现集净化、消声于一体的催化转化器结构最优设计，为高效率、低排放、小噪声和长寿命催化转化器设计提供科学优化方法和关键应用技术。

Aiming at the low conversion efficiency, loud noise and short life problems of the catalytic converter, the performance analysis of thermal-fluid-acoustic coupling chemical reaction and multiscale topology optimization of multifield coupled carrier metamaterial-microstructures for catalytic converter will be studied by combining the meshless method with topology optimization theory, in order to reduce engine exhaust emissions and environmental pollution. In meshless method, the multifield coupling mechanism of thermal-fluid-acoustic coupled with chemical reaction for catalytic converter is clarified by constructing the influence domain, interpolation function and mapping algorithm of node on the contact surface of micro channel, and then the complete simulation model and GPU parallel algorithm for thermal-fluid-acoustic strong coupling chemical reaction analysis of catalytic converter are established; the macro equivalent characterization method of thermal-mechanical-acoustic properties for micro cells is proposed, and the influence mechanism of the irregular micro channel of carrier and micro structure of cell on the comprehensive performance of catalytic converter is revealed. The integration multiscale topology optimization model of metamaterial-microstructures for multifield coupled catalytic converter carrier is established based on double negative material parameters. The proposed numerical models are modified and improved through the experiment results, and the multi-objective optimization function is formulated based on collaborative optimization idea of material and structure. The optimal structure design of catalytic converter that integrates purification and noise elimination is achieved by combining macro layout design with micro fine design technology. The scientific optimization method and some key practical techniques will be provided for the design of catalytic converter with high conversion efficiency, low emissions, minor noise and long life.