Browse Publications Technical Papers 2010-01-2240
2010-10-25

Experimental Investigation of Droplet Size and Velocity in Clustered Diesel Sprays under High-Pressure and High-Temperature Conditions 2010-01-2240

An experimental study on the interaction of sprays from clustered orifices is presented. Droplet size and velocity information has been gained by means of Phase Doppler Anemometry for different nozzle configurations varying the diverging opening angle between clustered sprays from 0° to 15°.These nozzles were investigated under high-pressure (50 bar) and high-temperature (800 K) conditions in a pressure chamber and the results are compared to two standard nozzles with flow rates corresponding either to the flow rate of the cluster nozzle configuration or half of the flow rate of this configuration. Two injection pressures, 600 bar and 1100 bar, were used to investigate all nozzles.This investigation completes the characterization of sprays from the cluster nozzles presented in an earlier work. Findings obtained therein were used to choose the measurement procedure for the present investigation and also to determine the spray width in order to obtain the spray angle.Comparison of measured and calculated results showed that the cluster configuration enhances evaporation compared to a conventional nozzle configuration. The observed spray angle for the cluster configuration is considerably higher, but the spray velocities are lower than for the conventional configuration. These findings also explain the reduction of the penetration length for clustered sprays.

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