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Combustion characteristics analysis of a free-piston engine generator coupling with dynamic and scavenging

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  • Yuan, Chenheng
  • Feng, Huihua
  • He, Yituan
  • Xu, Jing

Abstract

Free-piston engine generator is an unconventional engine, which abandons the crank and connecting rod mechanism. This paper focused on a numerical simulation for the research on the combustion characteristics of a free-piston diesel engine generator. An iteration numerical simulation method was presented by adopting coupled models of zero-dimensional dynamics, multidimensional scavenging and combustion. According to the coupled parameters of these models, the effects of the piston motion on combustion process were investigated compared with a corresponding traditional crank engine. The results indicate that compared with the conventional engine, the free-piston engine generator has a longer combustion duration due to its faster piston mean velocity in combustion process. While the heat release before top dead center, the isochoric heat release, and the heat release during the premixed combustion period both were lower than the traditional engine, and the post-combustion became more intense for the free-piston engine, thus a slight disadvantage of indicated efficiency was found. In addition, the in-cylinder average gas temperature and pressure were generally lower than the traditional engine, which contribute to the distinct advantages in NO discharge of the free-piston engine generator.

Suggested Citation

  • Yuan, Chenheng & Feng, Huihua & He, Yituan & Xu, Jing, 2016. "Combustion characteristics analysis of a free-piston engine generator coupling with dynamic and scavenging," Energy, Elsevier, vol. 102(C), pages 637-649.
    • Handle: RePEc:eee:energy:v:102:y:2016:i:c:p:637-649
    DOI: 10.1016/j.energy.2016.02.131
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    References listed on IDEAS

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    Cited by:

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    2. Zhang, Zhiyuan & Feng, Huihua & Jia, Boru & Zuo, Zhengxing & Yan, Xiaodong & Smallbone, Andrew & Roskilly, Anthony Paul, 2022. "Identification and analysis on the variation sources of a dual-cylinder free piston engine generator and their influence on system operating characteristics," Energy, Elsevier, vol. 242(C).
    3. Wu, Limin & Feng, Huihua & Jia, Boru & Tang, Zhifeng & Yan, Xiaodong & Wang, Wei, 2022. "A novel method to investigate the power generation characteristics of linear generator in full frequency operation range applied to opposed-piston free-piston engine generator _ Simulation and test re," Energy, Elsevier, vol. 254(PB).
    4. Tian, Yaming & Zhang, Hongguang & Li, Jian & Hou, Xiaochen & Zhao, Tenglong & Yang, Fubin & Xu, Yonghong & Wang, Xin, 2018. "Development and validation of a single-piston free piston expander-linear generator for a small-scale organic Rankine cycle," Energy, Elsevier, vol. 161(C), pages 809-820.
    5. Mitsuhide Sato & Takumi Goto & Jianping Zheng & Shoma Irie, 2020. "Resonant Combustion Start Considering Potential Energy of Free-Piston Engine Generator," Energies, MDPI, vol. 13(21), pages 1-17, November.
    6. Yuan, Chenheng & He, Lei & Zhou, Lifu, 2022. "Numerical simulation of the effect of spring dynamics on the combustion of free piston linear engine," Energy, Elsevier, vol. 254(PA).
    7. Geng, Heming & Wang, Yang & Zhen, Xudong & Liu, Yu & Li, Zhiyong, 2018. "Study on adaptive behavior and mechanism of compression ratio (or piston motion profile) for combustion parameters in hydraulic free piston engine," Applied Energy, Elsevier, vol. 211(C), pages 921-928.
    8. Yuan, Chenheng & Lu, Jiangchuan & Li, Shilei, 2023. "Thermoelectric coupling effect of secondary injection on gasoline fuel spray and mixing of a free vibration combustion alternator," Energy, Elsevier, vol. 281(C).
    9. Hung, Nguyen Ba & Lim, Ocktaeck, 2016. "A review of free-piston linear engines," Applied Energy, Elsevier, vol. 178(C), pages 78-97.
    10. Yuan, Chenheng & Liu, Yang & Han, Cuijie & He, Yituan, 2019. "An investigation of mixture formation characteristics of a free-piston gasoline engine with direct-injection," Energy, Elsevier, vol. 173(C), pages 626-636.
    11. Guo, Chendong & Zuo, Zhengxing & Feng, Huihua & Jia, Boru & Roskilly, Tony, 2020. "Review of recent advances of free-piston internal combustion engine linear generator," Applied Energy, Elsevier, vol. 269(C).
    12. Yuxi Miao & Zhengxing Zuo & Huihua Feng & Chendong Guo & Yu Song & Boru Jia & Yuyao Guo, 2016. "Research on the Combustion Characteristics of a Free-Piston Gasoline Engine Linear Generator during the Stable Generating Process," Energies, MDPI, vol. 9(8), pages 1-19, August.
    13. Xu, Yonghong & Tong, Liang & Zhang, Hongguang & Hou, Xiaochen & Yang, Fubin & Yu, Fei & Yang, Yuxin & Liu, Rong & Tian, Yaming & Zhao, Tenglong, 2018. "Experimental and simulation study of a free piston expander–linear generator for small-scale organic Rankine cycle," Energy, Elsevier, vol. 161(C), pages 776-791.
    14. Chen, Leiming & Xu, Zhaoping & Liu, Shuangshuang & Liu, Liang, 2022. "Dynamic modeling of a free-piston engine based on combustion parameters prediction," Energy, Elsevier, vol. 249(C).

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