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the spray formed by diesel nozzles and the defini-
tions of the coordinate system in the spray flow
field. The same direction as the nozzle axis was
defined as Z, and the radial direction was defined
as R. The origin was located at the nozzle tip.
The measurement was performed at the non-
dimensional axial positions of Z/dn=31, 63, 94, 1696 Jeekuen Lee, Shinjae Kang and Byungjoon Rho
156, 219, 281, 375, 469, and 562 far from the
nozzle tip. The measurement points at the radial
direction were densely set near the axis because
the droplet size of the spray varies sharply. How-
ever, their intervals became larger near the outer
region of the spray. The number of points at the
radial distance was 15. The number of measured
data at each measurement point was 20,000, and
the measurement mode was set not to exceed 300
see.
3. Results and Discussion
3.1 Time-resolved evolution of droplet size
Figure 4 shows the time-resolved evolution of
the droplet diameter, the AMD and the SMD at
the axial position of Z/d,=94 and at the center-
line of the spray for the 5-hole and the single-
250 150
Diameter I : Leading edge
......... AMD II : Central part
200 SMD IIh Trailing edge,
i End of
!~ ./njection
Start of i~
injection ~ --"":"~ "':
-0.5 O 0.5 1 1.5 2 2.5
Time from start of injection (ms)
(a) 5-hole nozzle (Z/d~=94, R/d,=0)
250 r
150
~100
E
200
~ 150
i,,.
100
50
11317
P
50 t~
~g
o3
150
t • Diameter I : Leading edge ]
......... AMD I1: Centralpart .I
SMC) II1: Trailing edge /
i~u~-., i...', lO
ii .
~, i . 50
|inJection" " " ~'5"_".'.'a;': "~" ~" " .L.-- :.-: .------- ............... . ~0
! I
o ~-'"~ /";..,~-':-:u.~. _ _.
I ..... I
-0.5 0 0.5 1 1.5 2 2.5 3
Time from start of injection (ms)
(b) Single-hole nozzle (Z/dn=94, R/dn=0)
Fig. 4
100
I:1
O
v
Time-resolved evolution of droplet diameter,
AMD and SMD at axial position of Z/dn=94
and at centerline of spray for 5-hole and
single-hole nozzle
hole nozzle. Time window, which is a time inter-
val for calculating the mean droplet sizes such as
AMD and SMD, was 0.15 ms. It was carefully