期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 43, 期 29, 页码 13583-13593出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.05.038
关键词
Free-piston engine; Hydrogen addition; Combustion; Emission; Heat release
资金
- Scientific Research Development Program of Chongqing Jiaotong University [15JDKJC-A011]
- Chongqing Graduate Education Innovation Fund Project [CYS17198]
The free-piston engine (FPE) is a new crankless engine, which operates with variable compression ratio, flexible fuel applicability and low pollution potential. A numerical model which couples with dynamic, combustion and gas exchange was established and verified by experiment to simulate the effects of different hydrogen addition on the combustion and emission of a diesel FPE. Results indicate that a small amount of hydrogen addition has a little effect on the combustion process of the FPE. However, when the ratio of hydrogen addition (R-H2) is more than 0.1, the R-H2 gives a positive effect on the peak in cylinder gas pressure, temperature, and nitric oxide emission of the FPE, while soot emission decreases with the increase of hydrogen addition. Moreover, the larger R-H2 induces a longer ignition delay, shorter rapid combustion period, weaker post-combustion effect, greater heat release rate, and earlier peak heat release rate for the FPE. Nevertheless, the released heat in rapid combustion period is significantly enhanced by the increase of R-H2. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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