Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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A study on Behavior of Turbulent Transient Jets with Butane and Propane

Butane 및 propane의 비정상 난류 제트 특성에 관한 연구

  • 이범호 (인하대학교 기계공학과 공과대학원) ;
  • 송학현 (인하대학교 기계공학과 공과대학원) ;
  • 조승환 (인하대학교 기계공학과 공과대학원) ;
  • 홍성태 (인하대학교 기계공학과 공과대학원) ;
  • 이대엽 (인하대학교 기계공학과) ;
  • 이태우 (국립환경연구원 교통환경연구소)
  • Received : 2010.03.16
  • Accepted : 2010.06.17
  • Published : 2010.06.30
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Abstract

In order to understand the behavior of transient gaseous injection used in an LPG (Liquefied Petroleum Gas) engine, turbulent incompressible transient jets with butane and propane were measured and analyzed at pressures of 1.5 bar and 2.0 bar with injector diameters of 3 mm and 5 mm. Mie-scattering method with a tracer was used, and images were processed to investigate the behavior of butane and propane jets. Distances from the nozzle to transition region were measured as $L_e/d_{inj}$=4.35~19.4, where $L_e$ and $d_{inj}$ indicate respectively a distance from nozzle to transition point and nozzle diameter. Slits and tubes around jet at near-field were introduced to measure the effect of entrainment and the diameter of jet, which revealed that the entrainment of surrounding air is significant for developing jet diameter. When the entrainment is restricted, the behavior of jet became deviating from the baseline. It was found that the virtual origin located outside of a nozzle towards jet tip within the conditions of this work, and its location was estimated as $x_o/d_{inj}$=0.56~7.25, where $x_o$ is a distance from nozzle to virtual origin.

Keywords

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