Research on combustion process of a free piston diesel linear generator
Research on combustion process of a free piston diesel linear generator
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DOI：
10.1016/j.apenergy.2015.10.069
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发表时间：
2016-01-01
期刊：
影响因子：
11.2
通讯作者：
Jia, Boru
中科院分区：
文献类型：
--
作者：
Feng, Huihua;Guo, Chendong;Jia, Boru
自由活塞柴油直线发电机（FPDLG）的活塞运动与传统的往复式发动机（TRE）不同。本文采用零维动力学和多维计算流体动力学（CFD）耦合模型，对FPDLG燃烧过程进行了数值模拟研究。基于活塞自由运动的计算结果，建立了活塞动力学模型和燃烧过程的CFD模拟模型，并用FPDLG样机的实际运行数据进行了验证。根据这两种模型的耦合参数，通过迭代计算研究了FPDLG在燃烧过程中的放热特性，并将TRE与结构参数相似的FPDLG的模拟结果进行了比较。结果表明，FPDLG的燃烧持续时间比TRE长。上止点前的热释放、等时热释放和快速燃烧期的热释放较低，燃烧后的热释放则更为强烈。此外，气缸内的平均温度普遍较低，而在膨胀冲程结束时开始升高。最大燃烧压力较低，持续时间较短。(C) 2015 Elsevier Ltd.版权所有。
The piston motion of a free-piston diesel linear generator (FPDLG) is different from the traditional reciprocating engine (TRE). Here we focused on a numerical simulation for the research on the combustion process of an FPDLG by adopting coupled models of zero-dimensional dynamics and multidimensional computational fluid dynamics (CFD). Piston dynamics model and CFD model to simulate the combustion process were set up based on the calculated results of free-piston motion, which were validated with tested data from a running FPDLG prototype. According to the coupled parameters of these two models, we studied the exothermic properties of the FPDLG during the combustion process through iterative computation, and compared the simulation results of a TRE to a FPDLG with comparable and similar structural parameters. The results' indicated that, combustion in the FPDLG lasted for a longer time compared with that in the TRE. While the heat release before top dead center (TDC), the isochoric heat release, and the heat release during the rapid combustion period were low, the post-combustion became more intense. Furthermore, the average temperature in the cylinder was generally lower, while became higher in the end of expansion stroke. In addition, the maximum combustion pressure was lower and lasted for a shorter time. (C) 2015 Elsevier Ltd. All rights reserved.