Journal of Mechanical Science and Technology

, Volume 29, Issue 11, pp 4993–5000 | Cite as

Study on the combustion process and work capacity of a micro free-piston engine

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Abstract

With the main idea of exploring combustion conditions and the work capacity of the micro free-piston engine, the study concern is visualization work including Homogeneous charge compression ignition (HCCI) combustion in the micro-chamber. The initial freepiston velocity was adjusted to achieve a wide range of compression ratio. The combustion characteristics, the piston motion and pressure variations under different compression ratios were discussed. Results indicate that the critical combustion condition occurs when the compression ratio rises to a certain degree. Two-stage combustion characteristics can be observed in micro HCCI combustion processes with the fuel of the DME/oxygen mixture. The micro-chamber pressure increases with the increase of the compression ratio. The critical peak pressure of 5.4 MPa is obtained when the initial piston velocity reaches 15.0 m/s and the diameter and the length of the microchamber is 3 mm and 37 mm, respectively.

Keywords

Free-piston Micro engine HCCI Pressure experiment Work capacity 
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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Qian Wang
    • 1
  • Liming Dai
    • 1
  • Kai Wu
    • 1
  • Jin Bai
    • 1
  • Zhixia He
    • 2
  1. 1.School of Energy and Power EngineeringJiangsu UniversityZhenjiangChina
  2. 2.Institute for Energy ResearchJiangsu UniversityZhenjiangChina

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