双活塞液压自由活塞发动机原理样机的研制及其压缩比

液压自由活塞发动机是将内燃机和液压泵集成为一体,以液体为工作介质,利用油液的压力能实现动力非刚性传输的一种特种发动机。提出一种特殊结构的液压自由活塞发动机设计方案,并据此研制了双活塞液压自由活塞发动机原理样机。由于压缩比对自由活塞发动机的性能具有重要影响,所以从结构设计、安装方式与行程控制等不同层面,对双活塞液压自由活塞发动机原理样机压缩比进行了详细而系统的研究。研究结果为液压自由活塞发动机的结构设计、控制及安装方式的选择皆有指导意义。

DEVELOPMENT OF A DUAL PISTON HYDRAULIC FREE PISTON ENGINE PROTOTYPE AND ITS COMPRESSION RATIO

A dual-piston hydraulic free piston engine (DHFPE) is a compact unit integrated by IC engines and a hydraulic pump. As a special IC engine, which realizes non-stiffness power transmission utilizing hydraulic pressure energy, it dif- fers dramatically from conventional IC engines. To deeply explore its working mechanism, a special structure DHFPE prototype is presented and developed. Based on the studied DHFPE prototype, three possible typical mount types are especially discussed and the corresponding compression ratio change range is induced. Additionally, the relationship between its compression ratio and design parameters, mount type, working variables is concluded. Besides above, for a certain DHFPE prototype, the dependence between its compression ratio and the compression energy is achieved and the ap- proaches to control the real compression ratio are presented. The results are helpful for DHFPE prototype development from the structure design and compression ratio control as well as selecting of mounts type.