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Measurement of droplet size distribution in core region of high-speed spray by micro-probe L2F

Journal of Thermal Science 2008年第1期17卷 90-96页

作者： Daisaku Sakaguchi Oluwo le Amida Hironobu Ueki Masahiro Ishida Graduate School of Science and Technology Nagasaki University1-14 Bunkyo-machi Nagasaki 852-8521 JAPAN Faculty of Engineering Nagasaki University Professor

In order to investigate the distribution of droplet sizes in the core region of diesel fuel spray, instantaneous measurement of droplet sizes was conducted by an advanced laser 2-focus velocimeter （L2F）. The micro-scale probe of the L2F is made up of two foci and the distance between them is 36 lain. The tested nozzle had a 0.2 mm diameter single-hole. The measurements of injection pressure, needle lift, and crank angle were synchronized with the measurement by the L2F at the position 10 mm downstream from the nozzle exit. It is clearly shown that the droplet near the spray axis is larger than that in the off-axis region under the needle full lift condition and that the spatial distribution of droplet sizes varies temporally. It is found that the probability density distribution of droplet sizes in the spray core region can be fitted m the Nukiyama-Tanasawa distribution in most injection periods.

关键词： droplet disintegration optical characterization laser 2-focus velocimeter

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Velocity and Size of droplets in Dense Region of Diesel Fuel Spray on Transient Needle Opening Condition

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Journal of Thermal Science 2005年第2期14卷 181-186页

作者： Hironobu UEKI Masahiro ISHIDA Daisaku SAKAGUCHI Nagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521JapanNagasaki University 1-14 Bunkyo-machiNagasaki 852-8521JapanNagasaki University 1-14 Bunkyo-machiNagasaki 852-8521Japan

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 36μm. 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.

关键词： droplet disintegration optical characterization laser 2-focus velocimeter.

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