Volume 27 Issue 9
Sep.  2012
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Article Navigation >  Journal of Aerospace Power  > 2012  >  27(9): 1921-1927
HU Chun-ming, LI Ji-qi, BAI Hong-lin, REN Li-hong, DONG Liang-liang. Experiment of in-cylinder mixture formation process low-pressure GDI engine[J]. Journal of Aerospace Power, 2012, 27(9): 1921-1927.
Citation: HU Chun-ming, LI Ji-qi, BAI Hong-lin, REN Li-hong, DONG Liang-liang. Experiment of in-cylinder mixture formation process low-pressure GDI engine[J]. Journal of Aerospace Power, 2012, 27(9): 1921-1927.
shu

Experiment of in-cylinder mixture formation process low-pressure GDI engine

  • 1.

    Tianjin Internal Combustion Engine Research Institute, School of Mechanical Engineering, Tianjin University, Tianjin 30007

  • 2.

    State Key Laboratory of Engines, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China

  • Received Date: 2011-10-25
  • Publish Date: 2012-09-28
    Abstract
  • A low pressure direct injection transparent optical engine bench was developed,and the in-cylinder mixture formation process was filmed.Different mixture formation patterns were analyzed in conditions of different combustion chamber geometries,fuel injection timings and engine speeds.The research results show that:guidance of the combustion chamber with decentralized cavity piston is better than that of the proto-engine's combustion chamber;fuel injection timing plays a key role in the mixture formation,and a good mixture formation can be obtained if choosing an injection timing when intake flow is not that strong and the piston moves in the middle position of the cylinder,when the intake flow is strong,an increased engine speed can accelerate the evaporation of the fuel droplets,but the guidance of the combustion chamber is weaked,which results in a bad mixture formation.On the contrary,when the intake flow is weak,higher engine speed can promote the effect of combustion chamber's guidance to the fuel plume.

     

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