• Title/Summary/Keyword: 분무선단 도달시간

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A Modeling about Penetration Behavior of Diesel Engine Liquid Fuel Spray (디젤기관의 분무선단 도달거리에 관한 모델링)

  • 안수길;배종욱
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.1
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    • pp.140-152
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    • 1989
  • The study on the penetration of sprays during the initial phase of injection period, i.e. ignition delay period, in high speed small D.I. diesel engines are strongly affected by such behavior. To investigate the penetration of the sprays injected through single cylinderical orifice, a mathematical model was developed and compared with experimental results. In this model, radial heterogeneity of fuel density in the spray, transiency of injection pressure difference, and spray outrunning phenomenon were considered simultaneously. Experiments on the behaviors of sprays in the high pressure air chamber were conducted at various injection pressure differences and different levels of back air pressure. The behaviors of sprays injected into the chamber through the conventional Bosch injection pump were visualized with side stroboscopic illumination. Comparison of the experimental results with predictions from the mathematical model confirmed the validity of the model. It was also found that during the initial phase of the injection period the penetration of sprays vs. time appeared to have two transition points; one corresponded to disintegration point of liquid fuel jet, the other to the beginning of steady state injection.

Intermittent Spray Characteristics of the Injection Nozzle for a Gasoline Engine (가솔린 엔진용 분사노즐의 간헐적인 분무특성)

  • 김원태;오제하;강신재;노병준
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.3
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    • pp.128-136
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    • 1997
  • Spray characteristics of a fuel injector have an important effect upon engine power and emission. Thus this study was investigated the spray characteristics of the intermittent injection using a gasoline fuel injector. Image processing system and PDA system were utilized for visualization of a spray behavior and measurements of a droplet size and velocity, respectively. Fuel injection duration was fixed with 3ms and injection pressure was varied such as 250kPa, 300kPa, 350kPa. for a high fuel injection pressure, spray tip arrival time was fluctuated at a vigorously disintegrated cross section. Axial velocity was linear correlated with fuel droplet size in the time interval of an injected main spray at spray downstream.

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