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Fig. 4. The AMD maintains the value of 10-
15/tm after showing the range of 10-20/zm at the
leading edge and the central part of the spray. The
SMD tends to change irregularly, and the value of
25-50/zm is distributed within 2 ms from SOl. In
Fig. 5(b) for the single-hole nozzle, unlike that
of the 5-hole nozzle, the detecting frequency of
the droplets at the central part of the spray is still
low. In addition, the fluctuation of the SMD
distribution is observed•
Figure 6 shows the time-resolved evolution of
the droplet diameter, the AMD and the SMD at
250
200
A
E 150
100
O
E
i5 5o
-0.5
250
200
E15o
lOO
E
._~
50
Fig. 6
(Z/dn=9. I, R/dn=94)
Spray tip
arrival time
Diameter
......... AMD
SMD
• ... ..- . ...... -. ...... :...-:.
150
0 0.5 1 t.5 2 2.5
Time from start of injection (ms)
(a) 5-hole nozzle
IOO
>
9
50 t/3
o 3
150
(Z/dn=6.9, R/d,=94) Diameter
......... AMI9
SMD
Spray tip
arnva~
Start of
injection
, ~' ,,, a', ,E.,do,,,.iecyon ....
Time from start of injection (ms)
(b) Single-hole nozzle
100
>
o
50 ¢/~
Time-resolved evolution of droplet diameter,
AMD and SMD at radial position of R/dn=
9.1 for 5-hole and R/dn=6.9 for single-hole
nozzle and at fixed axial position of Z/dn=94
the radial position of R/'d~=9.1 for the 5-hole
and R/dn=6.9 for the single-hole nozzle and at
the fixed axial position of Z/dn=94. These radial
positions, which were selected after investigating
the axial velocity distribution, correspond to the
mixing flow region, as shown in Fig. 3. Since the
diffusion processes of the 5-hole spray are more
active, the radial position of the 5-hole nozzle is
a little longer than that of the single-hole nozzle.
In the case of Fig. 6(a) for the 5-hole nozzle,
the central part of the spray, showing the low
detecting frequency of the droplets on the spray
axis, as shown in Figs. 4 and 5, is not observed
any more. It indicates that the droplets, separated
from the leading edge and the central part of the
spray, construct the mixing flow region. In the
case of the single-hole nozzle, as shown in Fig. 6
(b), the fluctuation of the SMD distribution is