Nozzle classification system in Japan based on the relative spray ...

Drift Potential Index
Reduction Percentage, %
Drift Potential Index
Reduction Percentage, %
3. Results and discussion
The DIXRP values of ES nozzle and the correspond<strong>in</strong>g standard errors with different nozzle
sizes were shown <strong>in</strong> Fig. 2.and 3. Except ES05 nozzles, the DIXRP values of different
nozzle-pressure comb<strong>in</strong>ations experienced a gentle <strong>in</strong>crease as the nozzle sizes <strong>in</strong>creased.
The reason why the <strong>in</strong>crease was not obvious could be that compar<strong>in</strong>g with other type of
nozzles, this type of nozzle had a relatively steady volume median diameter with different
nozzle sizes. Based on the manufacturer data, the average value of the volume median
diameter of the ES nozzle was 300 μm. The <strong>in</strong>crease of the flow rate might also lead an
<strong>in</strong>crease of the drift reduction performance due to the normalization by divid<strong>in</strong>g the spray
output and the stronger resistance force to w<strong>in</strong>d produced by more dense spray. The
difference of the droplet sizes and the small flow rate might have contributed to the rapid
<strong>in</strong>crease of the DIXRP values from ES05 to ES06.
120.00
100.00
80.00
60.00
40.00
20.00
0.00
-20.00
1.0MPa
1.5MPa
ES05-1.00
ES07-1.00
ES09-1.00
ES11-1.00
ES06-1.50
ES08-1.50
ES10-1.50
ES06-1.00
ES08-1.00
ES10-1.00
ES05-1.50
ES07-1.50
ES09-1.50
ES11-1.50
FIGURE 2: DIXRP values obta<strong>in</strong>ed under different nozzle-pressure comb<strong>in</strong>ations of ES series
nozzle with the nozzle height of 0.3m
150.00
100.00
50.00
0.00
-50.00
-100.00
1.0MPa
1.5MPa
ES05-1.00
ES07-1.00
ES09-1.00
ES11-1.00
ES06-1.50
ES08-1.50
ES10-1.50
ES06-1.00
ES08-1.00
ES10-1.00
ES05-1.50
ES07-1.50
ES09-1.50
ES11-1.50
FIGURE 3: DIXRP values obta<strong>in</strong>ed under different nozzle-pressure comb<strong>in</strong>ations of ES series
nozzle with the nozzle height of 0.4m
Fig. 4 and 5 shows the <strong>in</strong>fluence of the nozzle pressure on the DIXRP values. Expect ES05,
the DIXRP values obta<strong>in</strong>ed under two nozzle pressures had just a little fluctuation to each
nozzle size and no trend was found. The ma<strong>in</strong> reasons might be that the <strong>in</strong>fluence of the
decrease of the droplet size on the DIXRP values was offset by the <strong>in</strong>crease of the flow rate
and the droplet velocity when the nozzle pressure <strong>in</strong>creased.