Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Numerical Study on Impingement Process and Fuel Film Formation of GDI Spray according to Wall Geometry under High Ambient Temperature

고온에서 벽면 형상에 따른 GDI 분무의 충돌 과정 및 연료 액막 형성에 대한 수치적 연구

  • Shim, Young-Sam (Research Institute of Mechanical Technology, Pusan National University) ;
  • Choi, Gyung-Min (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Duck-Jool (School of Mechanical Engineering, Pusan National University)
  • Published : 2008.03.31
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Abstract

Numerical study on the impingement process and the fuel film formation of the hollow-cone fuel spray was conducted under vaporization condition, and the effect of the wall cavity angle on spray-wall impingement structure was investigated. A detailed understanding of this phenomena will help in designing injection systems and controlling the strategies to improve engine performance and exhaust emissions of the Gasoline Direct Injection (GDI) engine. The improved Abramzon model was used to model the spray vaporization process and the Gosman model was adopted for modeling of spray-wall impingement process. The calculated results of the spray-wall impingement process were compared with experimental results. The velocity field of the ambient gas, the Sauter Mean Diameter (SMD) and the generated fuel film on the wall, which are difficult to obtain by the experimental method, were also calculated and discussed. It was found that the radial distance after the wall impingement and the SMD decreased with increasing the cavity angle and the temperature.

Keywords

References

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