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.