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Numerical Analysis of the Mixture Formation in a Two-Stroke Wall-Guided LPG DI Engine for Extended-Range Electric Vehicle

  • Xu Boyan
  • Jiang Longlong
  • Sun Chaodong
  • Liu Yingchun
Article
  • 56 Downloads

Abstract

The use of automotive LPG characteristics which are easy to evaporate vaporization and carry. The paper presents a design of extended-range electric vehicle for wall-guided two stroke LPG engine with direct injection combustion system. Based on the modified vehicle LPG spray model, a database describing the characteristics of vehicle LPG fuel was built and imported into the CFD software. And the accuracy of the model is verified by the Schlieren experimental results. The concentration and velocity field of the mixture in the cylinder under different load conditions are numerically analyzed. The analyzed result indicated that the start injection time θ = 60°–70°CA BTDC under part load condition, the plug electrode near the gathering of a richer mixture is easy to be fired at spark ignition time, the obvious formation of mixture in cylinder is formed and the overall air-fuel ratio is above 40: 1. The start-transition working condition and large load conditions in the piston moves upward before closing the exhaust port to start injection LPG. The optimized LPG injection start time θ ensures that the fresh gas is locked in the cylinder when the exhaust port is closed (63°CA ABDC). In the ignition time of the spark plug, an ideal homogeneous mixture in the cylinder is realized.

Key Words

LPG Extended-range electric vehicle Two-stroke direct injection engine Wall-guided combustion system Numerical simulation 

Nomenclature

LPG

Liquefied Petroleum Gas

CFD

Computational Fluid Dynamics

DI

Direct Injection

GDI

Gasoline Direct Injection

BTDC

Before Top Dead Center

ABDC

After Bottom Dead Center

BBDC

Before Bottom Dead Center

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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xu Boyan
    • 1
  • Jiang Longlong
    • 1
  • Sun Chaodong
    • 1
  • Liu Yingchun
    • 2
  1. 1.School of Mechanical and Electrical EngineeringShandong Jianzhu UniversityJinanChina
  2. 2.Weifang Institute of TechnologyShandong WeifangChina

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