Analysis of the Scavenging Process of a Two-Stroke Free-Piston Engine Based on the Selection of Scavenging Ports or Valves
Analysis of the Scavenging Process of a Two-Stroke Free-Piston Engine Based on the Selection of Scavenging Ports or Valves
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DOI：
10.3390/en11020324
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发表时间：
2018-02
期刊：
影响因子：
3.2
通讯作者：
Boru Jia;Yaodong Wang;A. Smallbone;A. Roskilly
中科院分区：
文献类型：
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作者：
Boru Jia;Yaodong Wang;A. Smallbone;A. Roskilly
自由活塞发动机发电机 (FPEG) 是一种线性能量转换装置，旨在在混合动力电动汽车动力系统中使用。本研究将FPEG与相同尺寸的传统发动机(CE)的活塞动态特性进行了比较，并以排气门关闭正时为参数，比较了进气道扫气型和气门扫气型的气门正时差异。在Ricardo WAVE软件（2016.1）中开发了零维仿真模型，并从Matlab/SIMULINK（R2017a）中的仿真模型获得了活塞动力学。对于使用扫气口的CE和FEPG，为了将其功率输出提高到与CE相同的水平，建议将进气压力提高到1.2bar以上，比CE高约0.2bar。如果在FPEG样机开发过程中采用或参考带有排气门的CE气缸，建议提前关闭排气门以提高其功率输出，如果预计其输出功率与CE相同或更高，则建议采用更高的进气压力。
The free-piston engine generator (FPEG) is a linear energy conversion device with the objective of utilisation within a hybrid-electric automotive vehicle power system. In this research, the piston dynamic characteristics of an FPEG is compared with that of a conventional engine (CE) of the same size, and the difference in the valve timing is compared for both port scavenging type and valve scavenging type, with the exhaust valve closing timing is selected as the parameter. A zero-dimensional simulation model is developed in Ricardo WAVE software (2016.1), with the piston dynamics obtained from the simulation model in Matlab/SIMULINK (R2017a). For the CE and FEPG using scavenging ports, in order to improve its power output to the same level as that of a CE, the inlet gas pressure is suggested to be improved to above 1.2 bar, approximately 0.2 bar higher than that used for a CE. If a CE cylinder with exhaust valves is adopted or referred to during the development of an FPEG prototype, the exhaust valve is suggested to be closed earlier to improve its power output, and a higher intake pressure is also suggested if its output power is expected to be the same or higher than that of a CE.