微型自由活塞发动机HCCI催化燃烧稳定性机理与多场协同优化研究

本项目综合考虑了微型动力系统燃烧不稳定性的实际问题以及自由活塞发动机、均质压燃（HCCI）、催化燃烧的技术特性，开展燃用氢气的微型自由活塞发动机HCCI催化燃烧稳定性机理与多场协同优化的研究。综合运用原位漫反射傅立叶变换红外光谱、固定床实验以及密度泛函、相平衡理论，获取氢气在催化剂铂上的催化反应动力学基础数据，深入剖析氢气燃烧过程中催化反应与气相反应在热-流-化多场影响下的相互作用规律；在此基础上，构建微型自由活塞发动机HCCI催化燃烧过程的多维数值模型，结合数值模拟与发动机台架实验，重点研究微型自由活塞发动机HCCI催化燃烧特性及其对自由活塞发动机性能的影响，阐明微型自由活塞发动机HCCI催化燃烧过程稳定性控制机理。研究成果不仅可为微型自由活塞发动机的优化设计提供有力的科学依据与工程指导，还可丰富微尺度燃烧稳定性问题的解决方法。

Based on the unstable combustion problems of Power MEMS and technical characteristics of free-piston engine, homogeneous charge compression ignition (HCCI) and catalytic combustion, this project works on the studies of stability mechanism of HCCI-catalytic combustion of micro free-piston engine fueled with hydrogen and its multi-field synergistic optimization. The project first analyzes basic data of catalytic reaction kinetics of hydrogen on catalyst Pt, and the interactions between catalytic reaction and gaseous reaction of hydrogen under heat-flow-chemistry multi-fields using In situ DRIFTS and fix-bed reactor experiments, density functional and phase equilibrium theories. Then, multi-dimension numerical model is developed, and numerical simulation and engine tests are carried out to study HCCI-catalytic combustion characteristics and its effect on performance of micro free-piston engine. Finally, the mechanisms of stability mechanism of HCCI-catalytic combustion of micro free-piston engine are revealed. The results of the project can provide scientific basis and technical support for optimization design of micro free-piston engine, and enrich the methods of solving unstable combustion problems of Power MEMS.