The effect of nozzle diameter on spray characteristics including spray penetrations, core angle (far field) and Sauter mean diameter (SMD) were investigated in a constant volume combustion chamber. The nozzle diameter at the time of fuel injection were set to 0.20mm, 0.18mm, 0.14mm. Results indicate that penetration length reduces with the decrease of the nozzle diameter from 0.20mm to 0.14mm. However, they have little effect on core angle and the variation of core angle is less decreased at three conditions. In the process of spray development, spray penetrations show a linear growth before they keep a relatively stability value. The far-field spray cone angle shows a first suddenly enlarging and later maintains a constant value, but the results are affected by measurement mode. SMD suddenly decrease and later keep a constant value.
Nozzle diameter, Penetration length, SMD, Core angle
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