• Title/Summary/Keyword: Atomazation

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Visualization of the Flow in a Diesel Injection Nozzle In case of the Steady Flow Condition (정상류 조건에서의 디젤 연료 분사 노즐내의 유동가시화)

  • 김장헌;송규근
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.6
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    • pp.49-56
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    • 1999
  • The effects of the internal flow in a D.I. Diesel injection nozzle on the atomization of a spray were analyzed experimentally. Flow visualization studies were made using a transparent acrylic model nozzle as a diesel nozzle . Water instead of disel fuel was used as the injection liquid. The geometry of the model nozzle was scaled up 10 times of the actual nozzle and the injection pressure for the model nozzle was adjusted so as to achieve a Reynolds number at the discharge hole that was the same as the actual nozzle. Experimental results show that when the needle lift was small, the high turbulence in the sac chamber generated by the high velocity seat flow made the spread angle of the spray plume large. Cavitation, which arose from the sac chamber, makes the spread angle of the spray plume large but the discharge coefficient small.

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