An experimental investigation into the starting process of free-piston engine generator
An experimental investigation into the starting process of free-piston engine generator
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DOI：
10.1016/j.apenergy.2015.02.065
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发表时间：
2015-11-01
期刊：
影响因子：
11.2
通讯作者：
Roskilly, A. P.
中科院分区：
文献类型：
--
作者：
Jia, Boru;Tian, Guohong;Roskilly, A. P.
本文对自由活塞式发动机发电机样机的起动过程进行了实验研究。试验结果表明，在发动机行驶阶段，缸内最大压力和压缩比呈非线性增长，经过多次循环后趋于稳定。建议推进力在合理范围内。在固定起动力为125N的情况下，缸内混合气在第四次循环成功点火，压缩比超过9：1，第一次燃烧循环的缸内最大压力达到40bar以上。在冲程的中间部分，活塞以较高且相对恒定的速度运行。活塞峰值速度显着提高到4.0m/S左右，活塞运动周期波动大，发动机失火频繁。在失火循环过程中，活塞峰值速度降至近2.5m/S，活塞动力学过程与发动机运动过程相似。在此基础上，讨论了失火和进一步的稳定运行控制，以及线性电机模式的切换。(C)2015爱思唯尔有限公司。保留所有权利。
This paper presents an experimental investigation of the starting process of a prototype free piston engine generator (FPEG). Experimental test results show that during the motoring stage, the peak in-cylinder pressure and compression ratio increase in a non-linear manner and trend to reach a stable state after a number of cycles. The motoring force is suggested to be within a reasonable range. With a fixed starting force of 125 N, the in-cylinder air fuel mixture was successfully ignited at the fourth cycle with a compression ratio of over 9:1. The peak in-cylinder pressure for the first combustion cycle reached over 40 bar. The piston ran at high and relatively constant speed at the middle portion of the stroke. The peak piston velocity increases significantly to around 4.0 m/s. Cycle-to-cycle variation of the piston movement was significant and the engine misfired frequently. During the misfire cycles, the peak piston velocity decreased to nearly 2.5 m/s; and the piston dynamics were similar to the motoring process. Based on these, discussion on misfire and further stable running control, as well as the linear electric machine mode switch were presented. (C) 2015 Elsevier Ltd. All rights reserved.