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Numerical simulation of the effect of spring dynamics on the combustion of free piston linear engine

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  • Yuan, Chenheng
  • He, Lei
  • Zhou, Lifu

Abstract

Free piston linear engine (FPLE) is a new potential alternative to conventional engine, and the mechanical spring of the engine is a key energy storage device to maintain reciprocating operation and then affect combustion and thermodynamic. This article presents a study to reveal the effect of spring dynamics on the combustion performances of a linear diesel engine. A system model which couples spring dynamic model and multi-dimensional combustion model is proposed to discuss the variable spring stiffness effect on the combustion and heat release characteristics of the FPLE. The results indicate that the spring stiffness gives a positive excitation on the reciprocating frequency and engine compression ratio, although it brings about low fuel-air mixture uniformity for combustion reaction. Moreover, the great spring stiffness leads to high combustion pressure and fast combustion process due to its large compression ratio. The results suggest that properly increasing the spring stiffness is beneficial to increase the thermal efficiency of the engine, but too high spring stiffness will also result in higher NO emission and soot generation.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pa:s0360544222011446
    DOI: 10.1016/j.energy.2022.124241
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    References listed on IDEAS

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    1. Wang, Qian & Wu, Fan & Zhao, Yan & Bai, Jin & Huang, Rong, 2019. "Study on combustion characteristics and ignition limits extending of micro free-piston engines," Energy, Elsevier, vol. 179(C), pages 805-814.
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    4. Zhou, Yingcong & Sofianopoulos, Aimilios & Gainey, Brian & Lawler, Benjamin & Mamalis, Sotirios, 2019. "A system-level numerical study of a homogeneous charge compression ignition spring-assisted free piston linear alternator with various piston motion profiles," Applied Energy, Elsevier, vol. 239(C), pages 820-835.
    5. 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.
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    Cited by:

    1. Shoma Irie & Mitsuhide Sato & Tsutomu Mizuno & Fumiya Nishimura & Kaname Naganuma, 2022. "Effect of Nonlinear Spring Characteristics on the Efficiency of Free-Piston Engine Generator," Energies, MDPI, vol. 15(20), pages 1-17, October.
    2. Chendong Guo & Yahui Wang & Liang Tong & Huihua Feng & Zhengxing Zuo & Boru Jia, 2023. "Research on Piston Dynamics and Engine Performances of a Free-Piston Engine Linear Generator Coupling with Various Rebound Devices," Energies, MDPI, vol. 16(18), pages 1-20, September.

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