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Title: LDVによる直接噴射式ディーゼル機関筒内流動の研究
Other Titles: Study on In-Cylinder Flow of Direct Injection Diesel Engine by LDV Measurement
Authors: 植木, 弘信 / 石田, 正弘 / 片岡, 洋一 / 吉村, 長孫
Authors (alternative): Ueki, Hironobu / Ishida, Masahiro / Kataoka, Yoichi / Yoshimura, Yoshihiro
Issue Date: 25-Nov-1987
Publisher: 日本機械学会
Citation: 日本機械学會論文集. B編 53(495) p.3449-3453, 1987
Abstract: 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 fluctuation were almost the same between the tangential and axial components.
Keywords: Internai Combustion Engine / Direct Injection Diesel Engine / Swirl / Turbulence / Flow Measurement / LDV
URI: http://hdl.handle.net/10069/6730
ISSN: 03875016
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/6730

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