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Effects of Nozzle Length-diameter Ratio on Internal and External Flow Characteristics of Biodiesel Fuel  

Park, Su-Han (Graduate School of Hanyang University)
Suh, Hyun-Kyu (Graduate School of Hanyang University)
Lee, Chang-Sik (Department of Mechanical Engineering, Hanyang University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.15, no.4, 2007 , pp. 94-100 More about this Journal
Abstract
The purpose of this work is to investigate the effect of properties of diesel and biodiesel fuels on the nozzle cavitation and the effect of the length/diameter(L/D) ratio on internal and external flow pattern of nozzle at the various injection conditions. In order to study the effect of the L/D ratio on the nozzle cavitation characteristics of diesel and biodiesel, the characteristics of cavitation flow in the nozzle are visualized and analyzed at the injection pressure of 0.1 MPa to 0.7 MPa by using the visualized images. It was founded that the cavitation was formed in the nozzle orifice at the low injection pressure and the breakup of the issuing liquid jet was promoted at the low L/D ratio. When the L/D ratio decrease, cavitation beginning and growth were affect by cavitation number and Reynolds number.
Keywords
Biodiesel; Nozzle cavitation; Discharge coefficient; Cavitation number; The length-diameter ratio L/D;
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