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http://dx.doi.org/10.3795/KSME-B.2007.31.3.264

Effect of Nozzle Orifice Shape and Nozzle Length-to-Diameter Ratio on Internal and External Flow Characteristics of Diesel and Biodiesel Fuel  

Park, Su-Han (한양대학교 대학원 기계공학과)
Suh, Hyun-Kyu (한양대학교 대학원 기계공학과)
Lee, Chang-Sik (한양대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.31, no.3, 2007 , pp. 264-272 More about this Journal
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.
Keywords
Biodiesel; Nozzle Cavitation; Discharge Coefficient; Cavitation Number; Length-To-Diameter Ratio L/D; Orifice Nozzle;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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