Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Numerical Simulation for the Spring Hardness of a Free Piston Linear Engine

프리피스톤 리니어엔진의 스프링경도에 따른 수치해석연구

  • Hung, Nguyenba (Graduate of Mechanical and Automotive Engineering, University of Ulsan) ;
  • Oh, Yong-Il (Graduate of Mechanical and Automotive Engineering, University of Ulsan) ;
  • Park, Kyu-El (Department of Mechanical and Automotive Engineering, University of Ulsan) ;
  • Lim, Ock-Taeck (Department of Mechanical and Automotive Engineering, University of Ulsan)
  • 왼바흥 (울산대학교 기계자동차공학과 대학원) ;
  • 오용일 (울산대학교 기계자동차공학과 대학원) ;
  • 박규열 (울산대학교 기계자동차공학부) ;
  • 임옥택 (울산대학교 기계자동차공학부)
  • Received : 2012.06.28
  • Accepted : 2012.08.24
  • Published : 2012.08.31
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Abstract

This research numerically analyses the effects of the damping device on the operation characteristics of a free piston linear engine. In this paper, the free piston linear engine uses spring as a damping device. The investigated parameter is spring hardness which is varied at 0.5, 1, 2.9, and 14.7 N/mm. The effects of spring hardness on the dynamic characteristic, thermodynamic characteristic and electric power of the engine are investigated. Beside, the equivalent ratio is also changed to provide more information for this study. The simulation results show that, by increasing spring hardness from 0.5 to 14.7 N/mm, all of parameters related to dynamic characteristic such as piston velocity, acceleration, displacement, and frequency increase accordingly. Beside, the peak pressure in the cylinder and electric power are also increased when increasing spring hardness. The tendency is also observed at varied equivalent ratios.

Keywords

References

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Cited by

  1. A Study About Effects of Changed Load on Dynamic·Combustion Characteristics of Linear Engine vol.24, pp.3, 2013, https://doi.org/10.7316/KHNES.2013.24.3.206