基于Simulink和GT-Power的自由活塞发动机仿真

Simulation of Free Piston Linear Generator based on Simulink and GT-Power

自由活塞发动机(Free Piston Linear Generator,以下称FPLG)具有结构简单,效率高,适应燃料多的优点。由于取消了曲柄连杆机构,活塞的位置控制是实现自由活塞发动机稳定运行的关键。本文基于Simulink建立了机械-流体-电控耦合系统模型,并用GT-Power及样机倒拖试验数据进行流体部分的验证。针对FPLG的非稳定状态建立了仿真模型,着重研究FPLG运行过程中换气,燃烧过程的不稳定情况,及其对FPLG运行特性的影响。

Free Piston Linear Generator （FPLG） has the advantages of simple structure, high efficiency, and applicable to a variety of fuels. Due to the lack of the crankshaft and flywheel, the control of piston position is the key to achieving stable operation of FPLG. In this paper, a model of mechanical-fluid-electrical coupling system is built based on Simulink. GT-Power as well as proto- type data is used to carry out the verification of fluid part. The model is modified to simulate the un- steady state of the engine, and the instability of the gas exchange and combustion process, and their influences on the operation of the FPLG.