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(2002) investigated the spray characteristics from
diesel injectors with various nozzle tip shapes,
including a VCO and a multi-hole diesel nozzle,
by an optical imaging technique. Through the micro-
scopic image analysis, it was suggested that the
droplets are formed at the end of ligament around
the spray surface.
in this paper, the intermittent atomization
characteristics of a multi-hole and a single-hole
diesel spray were experimentally examined to in-
vestigate the development process of the diesel
spray, and the comparisons of AMD (arithmetic
mean diameter, D10) and SMD (Sauter mean
diameter, D3z) between the two nozzles were
made.
2. Experimental Apparatus
2.1 Fuel injection system
In order to investigate experimentally the
atomization characteristics of the diesel spray
formed by the 5-hole and the single-hole nozzle,
an experimental apparatus composed of the fuel
injection system and PDPA system was used.
The fuel injection system was composed of the
fuel injection pump, DC motor, droplet collection
device and fixed frame, as shown in Fig. I. The
experiments were performed under room temper-
ature and atmospheric pressure. The fuel injection
pump was an in-line PE type, 8 barrels, and it
was driven by a 15 kW DC motor that is able to
rotate at maximum speed of 3600 rpm. Fuel used
in this test was KS #2 diesel oil with specific
gravity of 0.8315, kinematic viscosity of 3.71 cSt,
refraction rate of 1.468 at 24"C.
2.2 Fuel injection nozzle
The fuel injection nozzle was a mini-sac type
multi-hole diesel nozzle with a 2-spring nozzle
~) DC motor (~) Spray separator G AD converter
(~) Injection pump (~ Suction tank (~ IBM computer
(~ Fuel filter ~) Suction fan motor @ Ar-lon laser
(~ Fuel tank (~) RpkC-meter(tocometer) @ Transmitting optics
(~ Nozzle ~ Pressure sensor ~ Reoeving optic
PDPA processor
Fig. I Schematic diagram of experimental apparatus Intermittent Atomization Characteristics of Multi-Hole and Single-Hole Diesel Nozzle 1695
s~t~a w,~
,t ,~ ~,~,r~
-1- d
,-b
I I
I
Fig. 2 Photograph of disassembled 5-hole diesel
nozzle and schematic diagram of nozzle tip
holder, as shown in Fig. 2.
The hole number of the multi-hole nozzle was
5, and there was a tested hole in the vertex. Other