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measured irregularly. After the central part passes
through the measurement point, the detecting fre-
quency of the droplet increases considerably, and
many of large-sized droplets over 100,am are
detected. The AMD is about 40 ,am during injec-
tion period, but it maintains the value of 10-
15,am after 2 ms from SOl. The SMD tends to
change irregularly, and the value of about 100 ,am
is distributed within 2 ms from SOl. It indicates
that the trailing edge of the spray, which is mainly
formed after the end of injection and in which
numerous large-sized droplets are measured, is
also important part in the evaluation of the atomi-
zation characteristics.
Figure 5 shows the time-resolved evolution of
the droplet diameter, the AMD and the SMD at
the axial position of Z/dn=219 and at the cen-
250 150 !
• Diameter (Z/dn=219, R/dn=0) ]
I
........ AiD I
200 SMD l
arnval time ~_ End of J 50 ~
~100 ! jection =i~
E :.. ....
Start of i " " .............. ~ .................. ..~z....... ] A
I'~ 50-injection !:"~'.~-'~"~.'.:i ' '" ~0 "~
t
, . '...;,1:., ~. ~. ..,~ .. :.. ,......:. :..
0 -":" .... i' "~
-0.5 0 0.5 1 1.5 2 2.5 3
Time from start of injection (ms)
(a) 5-hole nozzle
250 150
Diameter (Z/dn=219, R/dn--0)
200 ......... AMD
SMD 100
E 150
Spray tip ~
arrival time ~ 50
loo i ' . • ~-
Start of
50 -injection ~~.~ -'." '~ 0
• [ ~~'~. -" • ". ;" ".?" : • =1
• . "..4-.5. " ' ~";~..:
0 . ~ , a'E"d°f)"i~°".. . I
-05 0 0.5 1 15 2 2.5 3
Time from start of injection (ms)
(b) Single-hole nozzle
]Fig. 5 Time resolved evolution of droplet diameter,
AMD and SMD at axial position of Z/dn =
219 and at centerline of spray for 5-hole and
single-hole nozzle
terline of the spray for the 5-hole and the single- 1698 Jeekuen Lee, Shinjae Kang and Byungjoon Rho
hole nozzle.
In Fig. 5 (a) for the 5-hole nozzle, the detecting
frequency of the droplets in the leading edge and
the central part of the spray is considerably
increased, so that it is difficult to discriminate the
boundary among the three parts mentioned in