Abstract
The purpose of this study was to obtain the relationship between the droplet size of a spray, the nozzle hole configuration represented by the nozzle length/diameter ratio (L/D), and the shape of the inlet of the nozzle hole in a steady spray in the range of diesel injection pressures, and to obtain a possible mechanism of the nozzle hole configuration effect. It is shown that the droplet size is insensitive to the L/D for less than a certain value, for a simple straight nozzle, and is apparently affected by the shape of the inlet. However, the inlet shape effect is not substantial, because it disappears when the virtual injection velocity obtained on the basis of the contraction coefficient of the nozzle is applied instead of the mean injection velocity obtained from the nominal nozzle diameter. These conclusions were derived from various lands of experiments using several types of nozzles and different kinds of measurements. A possible mechanism is presented that can explain most of the results.
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