Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Effect of Nozzle Orifice Shape and Nozzle Length-to-Diameter Ratio on Internal and External Flow Characteristics of Diesel and Biodiesel Fuel

노즐 오리피스 형상 및 형상비가 디젤과 바이오디젤 연료의 노즐 내부 및 외부 유동특성에 미치는 영향

  • 박수한 (한양대학교 대학원 기계공학과) ;
  • 서현규 (한양대학교 대학원 기계공학과) ;
  • 이창식 (한양대학교 기계공학과)
  • Published : 2007.03.01
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Abstract

The aim of this study is to investigate the effects of nozzle orifice shapes and the nozzle length-to-diameter ratio(L/D) on the nozzle cavitation formation inside the orifice and the external flow pattern. The nozzle used in this work was tested the taper orifice nozzle and the rectangular orifice nozzle which was made from the transparent acrylic acid resin. For studying the effect of the nozzle L/D ratio, it was used to three L/D ratios of 3.33, 10, and 20. The cavitation flow of nozzle was visualized by using the ICCD camera and optical system. This work revealed that the flow rate and discharge coefficient($C_d$) of the taper orifice nozzle was larger than those of the rectangular orifice nozzle at the same injection pressure. The cavitation flow was observed in the nozzle orifice at the low injection pressure and the breakup of liquid jet was promoted as the L/D ratio is decreased. The cavitation of biodiesel fuel was formed at the lower injection pressure than that of diesel fuel because of higher viscosity and density.

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References

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  1. Correlations of Internal Nozzle Flow in Circular and Elliptical Nozzles with External Flow vol.36, pp.3, 2012, https://doi.org/10.3795/KSME-B.2012.36.3.325
  2. Cavitating Flow in Circular and Elliptical Nozzles vol.35, pp.10, 2011, https://doi.org/10.3795/KSME-B.2011.35.10.1005