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The effects of key parameters on the transition from SI combustion to HCCI combustion in a two-stroke free piston linear engine

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  • Hung, Nguyen Ba
  • Lim, Ocktaeck
  • Iida, Norimasa

Abstract

An investigation was conducted to examine the effects of key parameters such as intake temperature, equivalence ratio, engine load, intake pressure, spark timing and spring stiffness on the transition from SI combustion to HCCI combustion in a two-stroke free piston linear engine. Operation of the free piston engine was simulated based on the combination of three mathematical models including a dynamic model, a linear alternator model and a thermodynamic model. These mathematical models were combined and solved by a program written in Fortran. To validate the mathematical models, the simulation results were compared with experimental data in the SI mode. For the transition from SI combustion to HCCI combustion, the simulation results show that if the equivalence ratio is decreased, the intake temperature and engine load should be increased to get a successful SI-HCCI transition. However, the simulation results also show that the in-cylinder pressure is decreased, while the peak in-cylinder temperature in HCCI mode is increased significantly if the intake temperature is increased so much. Beside the successful SI-HCCI transition, the increase of intake pressure from Pin=1.1bar to Pin=1.6bar is one of solutions to reduce peak in-cylinder temperature in HCCI mode. However, the simulation results also indicate that if the intake pressure is increased so much (Pin=1.6bar), the engine knocking problem is occurred. Adjusting spring stiffness from k=2.9N/mm to k=14.7N/mm is also considered one of useful solutions for reducing the peak in-cylinder temperature in HCCI mode as well as avoiding engine knock. Besides, the change of spark timing is suggested as a benefic method to help the control of the SI-HCCI transition to be more convenient. To get a successful SI-HCCI transition with reducing of peak temperature in HCCI mode as well as avoiding engine knock, the simulation results show that the engine should be operated with following conditions: equivalence ratio ϕ=0.7, engine load RL=180Ω, intake temperature Tin=400K, intake pressure Pin=1.2bar, spark timing in SI mode xig=3mm and spring stiffness k=14.7N/mm.

Suggested Citation

  • Hung, Nguyen Ba & Lim, Ocktaeck & Iida, Norimasa, 2015. "The effects of key parameters on the transition from SI combustion to HCCI combustion in a two-stroke free piston linear engine," Applied Energy, Elsevier, vol. 137(C), pages 385-401.
    • Handle: RePEc:eee:appene:v:137:y:2015:i:c:p:385-401
    DOI: 10.1016/j.apenergy.2014.10.001
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    References listed on IDEAS

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    2. Xuezhen Wang & Feixue Chen & Renfeng Zhu & Guilin Yang & Chi Zhang, 2018. "A Review of the Design and Control of Free-Piston Linear Generator," Energies, MDPI, vol. 11(8), pages 1-21, August.
    3. 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.
    4. 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).
    5. Hung, Nguyen Ba & Lim, Ocktaeck, 2016. "A review of free-piston linear engines," Applied Energy, Elsevier, vol. 178(C), pages 78-97.
    6. Jia, Boru & Smallbone, Andrew & Feng, Huihua & Tian, Guohong & Zuo, Zhengxing & Roskilly, A.P., 2016. "A fast response free-piston engine generator numerical model for control applications," Applied Energy, Elsevier, vol. 162(C), pages 321-329.
    7. Li, Jian & Zuo, Zhengxing & Jia, Boru & Feng, Huihua & Mei, Bingang & Smallbone, Andrew & Roskilly, Anthony Paul, 2024. "Operating characteristics and design parameter optimization of permanent magnet linear generator applied to free-piston energy converter," Energy, Elsevier, vol. 287(C).
    8. Ziwei Zhang & Huihua Feng & Zhengxing Zuo, 2020. "Numerical Investigation of a Free-Piston Hydrogen-Gasoline Engine Linear Generator," Energies, MDPI, vol. 13(18), pages 1-16, September.
    9. 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.
    10. 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).

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