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In order to investigate the distribution of droplet sizes in the core region of diesel fuel spray,instantaneous meas- urement 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 loci and the distance between them is 36μm.The tested nozzle had a 0.2 mm di- ameter 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 to the Nukiyama-Tanasawa distribution in most injection periods.
In order to investigate the distribution of droplet sizes in the core region of diesel fuel spray, instantaneous meas- urement 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 loci and the distance between them is 36μm. The tested nozzle had a 0.2 mm di-ameter 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 is 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 is temporally. It is found that the probability density distribution of droplet sizes in the spray core region can be fitted to the Nukiyama-Tanasawa distribution in most injection periods.