Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Modeling Dynamic Behavior and Injection Characteristic of a GDI Injector

GDI 인젝터의 동적 거동과 분사 특성에 대한 모델링

  • 이계은 (현대케피코 기술연구소) ;
  • 김나영 (현대케피코 기술연구소) ;
  • 조영준 (현대케피코 기술연구소) ;
  • 이동률 (현대케피코 기술연구소) ;
  • 박성욱 (한양대학교 기계공학과)
  • Received : 2017.12.04
  • Accepted : 2017.12.19
  • Published : 2017.12.30
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Abstract

A gasoline direct injection engine has an intake air temperature can be lowered by the fuel vaporization in the combustion chamber increase the volume efficiency is high compression ratio. Therefore, study for injection rate and characteristics which influence mixture formation in combustion chamber is important. Movement of the injector needle has a direct effect on the injection of the fuel, such as formation of cavitation, the fuel injection rate, etc. Therefore, recent studies on the dynamic characteristics of the injector considering the movement of the needle have been reported, but it takes a lot of time and cost to experimentally confirm the movement of the needle inside the injector. In this study, AMESim, a commercial 1-D code, and Star-CCM+, a 3-D CFD code, were used to predict the dynamic performance of the injector with needle motion. In order to predict the movement of the needle under the high pressure, the result of the surface pressure distribution according to the movement of the needle was derived by using the morphing technique of flow analysis. In addition, we predicted the injection rate of the injector considering the movement of the needle in conjunction with the 1-D code. The injection rate of the injector was measured by the BOSCH's method and the results were similar to those of the simulation results. This method can predict the injection rate and injection characteristics and this result is expected to be used to predict the performance of gasoline direct injection engines with low cost and time in the future.

Keywords

References

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