混合动力汽车的球形发动机热力学过程

介绍球形发动机工作原理及基本结构，研究发动机气缸容积变化规律，进而建立发动机热力学过程理论模型，分析发动机燃烧过程。利用FLUENT开展对比仿真研究，并对发动机燃油喷射过程进行分析。结果表明气缸内部温度与压力曲线的计算结果与仿真结果基本一致，验证了理论模型的正确性。仿真结果显示在燃油喷射过程中，燃油喷射轨迹呈涡团状，引起局部富油，使得燃烧性能变差。
Basing on the introduction of working principle and structure of sphere cam engine, the variation of cylinder volume was studied. Furthermore, the theoretical thermodynamic model of engine was established to analyze the combustion process of sphere cam engine. Then the theory result was compared with the simulation result in FLUENT. The oil spray process was studied in detail. Results show that the calculated pressure curve and temperature curve in cylinder are similar to the simulation results, which validates the validity of theory model. However, the vortex of sprayed oil observed in FLUENT can lead to the rich oil phenomena, which may decrease the combustion efficiency. 