Study on In-Cylinder Flow of Direct Injection Diesel Engine by LDV Measurement

Hironobu Ueki, Masahiro Ishida, Yoichi Kataoka, Yoshihiro Yoshimura

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1 Citation (Scopus)


Swirl, turbulence and the cyclic fluctuation have been examined using LDV in a motored direct injection diesel engine with a spiral port, a troidal piston cavity and a bore of 102 mm. Measurements were made at a low engine speed of 600 rpm at nine points along a cylinder diameter. The authors have developed a new method to analyze turbulence accurately even under the low data rate condition by introducing a concept of confidence interval. It has been clearly shown that there exists a longitudinal vortex in the piston cavity, the tangential velocity distribution shows a forced vortex pattern, and the swirl ratio increases rapidly in the piston cavity. And turbulence in a compression stroke was not always uniform in the cylinder, but in-cylinder averaged turbulence and the cyclic were almost the between the and axial components.

Original languageEnglish
Pages (from-to)3449-3453
Number of pages5
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Issue number495
Publication statusPublished - 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering


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