Abstract
A fuel is sprayed through a fuel nozzle for 0.5∼2 sec at the top of a tall sedimentation tower of about 6m in height and 0.7m in diameter. Though the falling speeds differ very much for coarse and fine drops, they all accumulate gradually on the very large (0.8m in diameter) scalepan of an automatic recording balance, set at the bottom of the tower. The calibration of the sedimentation tower is done by the molten wax method. From these calibration curves, the weight-time cumulative curve can easily be converted into the weight-diameter cumlative curve, from which the median diameter and the distribution of the size of sprayed drops may be found. As an example for the use of this drop size analyser, fuel sprays from various types of injection nozzles used in Diesel engines were tested. Distributions of the size of drops in all sprays were proved to fit well the chi-square distribution function.
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