Development and validation of a free-piston engine generator numerical model
Development and validation of a free-piston engine generator numerical model
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DOI：
10.1016/j.enconman.2014.11.054
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发表时间：
2015-02-01
影响因子：
10.4
通讯作者：
Roskilly, A. P.
中科院分区：
文献类型：
--
作者：
Jia, Boru;Zuo, Zhengxing;Roskilly, A. P.
本文着重于火花点火自由活塞发动机发电机的数值模拟和模型验证与测试结果。推导了起动过程和稳态运行的详细子模型。压缩和膨胀过程不是理想气体等熵过程，而是同时考虑了传热和漏气。仿真结果表明，无论是起动过程还是稳态运行，均与样机试验数据吻合较好。在启动过程中，每个运行周期的缸内气体压力差可控制在1 bar以内。对于稳定运行过程，差异小于5%，压力-容积图上封闭的面积相似，表明该模型可以预测发动机产生的功率和发动机效率。在此基础上，模拟了不同起动马达力下的起动过程和不同节气门开度下的燃烧过程。预测了发动机100%负荷稳定运行时的性能，在4kW输出功率下，样机的效率为31.5%。(C)2014爱思唯尔有限公司版权所有。
This paper focuses on the numerical modelling of a spark ignited free-piston engine generator and the model validation with test results. Detailed sub-models for both starting process and steady operation were derived. The compression and expansion processes were not regarded as ideal gas isentropic processes; both heat transfer and air leakage were taken into consideration. The simulation results show good agreement with the prototype test data for both the starting process and steady operation. During the starting process, the difference of the in-cylinder gas pressure can be controlled within 1 bar for every running cycle. For the steady operation process, the difference was less than 5% and the areas enclosed on the pressure-volume diagram were similar, indicating that the power produced by the engine and the engine efficiency could be predicted by this model. Based on this model, the starting process with different starting motor forces and the combustion process with various throttle openings were simulated. The engine performance during stable operation at 100% engine load was predicted, and the efficiency of the prototype was estimated to be 31.5% at power output of 4 kW. (C) 2014 Elsevier Ltd. All rights reserved.