Simulation of mixed gas formation for a spray-wall complex guided LPG direct injection engine

  • Bo-yan Xu
  • Xiang-long Liu
  • Long-long Jiang
  • Juan Xu


To obtain an ultralean air-fuel ratio and to reduce engine-out NOX and HC emissions induced by the richer mixture near the spark plug, a spray and wall complex guided combustion system has been developed by utilizing the fuel characteristics of LPG. The new combustion system configuration is optimized by using a commercial CFD code, FIRE V2013, and the reliability of the system has been experimentally demonstrated by Plane Laser-Induced Fluorescence (PLIF). The mixture formation in the new combustion system under part load (2,000 rpm) is numerically simulated. With an injection timing of 40°CA BTDC, the LPG spray which is injected from two upper holes, reaches the ignition point, and the other part of the LPG spray which is injected from the bottom hole, is directed to the ignition point through the vertical vortices at the same time. At the ignition timing of about 20°CA BTDC, the two-part mixtures have been shown to form a stable and richer stratified mixture around the ignition point, and the maximum global air-fuel ratio reaches to 60: 1.

Key words

LPG Spray-wall complex guided Direct injection engine Air-fuel ratio Simulation 



liquefied petroleum gas


computational fluid dynamics


gasoline direct injection


before top dead center


bottom dead center


sauter mean diameter


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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Bo-yan Xu
    • 1
  • Xiang-long Liu
    • 1
  • Long-long Jiang
    • 1
  • Juan Xu
    • 2
  1. 1.School of Mechanical and Electronic EngineeringShandong Jianzhu UniversityShandongChina
  2. 2.Institute of Oceanographic InstrumentationShandong Academy of SciencesShandongChina

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