Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Fundamental Study on the Investigation of Bubbling Phenomenon in the Injector for the Development the LPDi Engine

액상 LPG 직접 분사식 기관 개발을 위한 인젝터 내 기포발생현상의 원인 규명에 관한 기초연구

  • Noh, Ki-Chol (Department of Mechanical Engineering, Sungkyunkwan University) ;
  • Lee, Jong-Tai (Department of Mechanical Engineering, Sungkyunkwan University)
  • 노기철 (성균관대학교 기계공학부) ;
  • 이종태 (성균관대학교 기계공학부)
  • Published : 2006.11.01
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Abstract

One of the most important subjects to develop a LPDi engine is to suppress the bubble generated inside the liquid LPG direct injector. For the purpose of this, the analogy visualization injector to visualize the generation and behaviors of bubble is manufactured, and the bubbling phenomenon and behaviors of bubble are visualized and investigated according to the change of the temperature around an injector wall, fuel pressure and a needle configuration. As results, it was found that the bubble inside the injector is generated around an injector hole and after rising by buoyancy it disappears around the top of a nozzle. The number of bubbles generated is little changed regardless of the lapse of time but it remarkably increases as the temperature around the injector increases. Also, it was known that as the sac volume in LPDi injector decreases the generation of bubble is more active and the rising velocity of bubble generated is increased.

Keywords

References

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