• Title/Summary/Keyword: Spray Tip Arrival Time

Search Result 3, Processing Time 0.018 seconds

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
    • /
    • v.5 no.3
    • /
    • pp.128-136
    • /
    • 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.

  • PDF

A Study on the Injection Characteristics of Biodiesel Fuels Injected through Common-rail Injection System (커먼레일식 분사시스템에서 바이오디젤연료의 분사특성에 관한 연구)

  • Seo, Young-Taek;Suh, Hyun-Kyu;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.15 no.5
    • /
    • pp.97-104
    • /
    • 2007
  • The object of this work is to analyze the macroscopic spray performance and atomization characteristics between diesel and biodiesel fuels. In this study, the effects of mixture ratios of biodiesel fuel on the spray tip penetration, fuel injection rate, spray cone angle, and the atomization characteristics such as droplet size, droplets distribution, and spray arrival time according to the axial distance were investigated at various injection parameters. It is revealed that the injection rate is more affected by injection pressure than mixture ratio. And, the spray development process is closely matched between diesel and biodiesel fuels. However, the droplet atomization characteristics of biodiesel shows deteriorated results as the mixture ratio of biodiesel increased because of the high viscosity and density.

A Study on the Correlation of Droplets Size and Velocity of the Pintle Type Gasoline Injector with Intermittent Injection (간헐적으로 분사되는 핀틀형 가솔린 분사기의 액적크기와 속도 상관관계에 관한 연구)

  • Kang, S.J.;Kim, W.T.
    • Journal of ILASS-Korea
    • /
    • v.3 no.1
    • /
    • pp.34-42
    • /
    • 1998
  • The correlation between the droplets size and the velocity are investigated for an intermittent spray of the pintle type fuel injector employed in a port injection gasoline engine. The analysis such as the mean droplet size, SMD, and velocity under the fixed injection period and varied fuel pressures are conducted utilizing PDPA systems. As results, the experimental data obtained, show that the larger droplet sizes. the higher velocities during the spray tip arrival time, and that at Z=70mm, r=8mm, both droplet sizes and velocities are peak. At the upstream, flow of droplets are dominated by injection pressure, which are more effected inertia force of droplets at the downstream of Z=70mm.

  • PDF