Velocity and size of droplets in dense region of diesel fuel spray on transient needle opening condition

Hironobu Ueki, Masahiro Ishida, Daisaku Sakaguchi

Research output: Contribution to journalArticlepeer-review

Abstract

In order to investigate the effect of transient needle opening on early stage of spray behavior, simultaneous measurements of velocity and size of droplet were conducted by a newly developed laser 2-focus velocimeter (L2F). The micro-scale probe of the L2F was consisted of two foci with a distance of 36 μm. The tested nozzle had a single hole with a diameter of 0.2 mm. The measurements of injection pressure, needle lift, and crank angle were synchronized with the spray measurement by the L2F at the position 10 mm downstream from the nozzle exit. It has been clearly shown that the velocity and size of droplet increase with needle valve opening and that the probability density distribution of droplet size can be fitted to the Nukiyama-Tanasawa distribution under the transient needle opening condition.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalJournal of Thermal Science
Volume14
Issue number2
DOIs
Publication statusPublished - Jun 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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