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National Advisory Committee for Aeronautics, Technical Notes - Effect of the Reservoir Volume on the Discharge Pressures in the Injection System of the NACA Spray Photography Equipment

Tests were made to determine the effect of the reser-
vein-volume on the discharge pressures "in'the injection"
syst-em of the N. A. G. A. spray photography equipment. The
data obtained are applicable to the design of a com: on
rail fuel— —injection system. The data show that an injec—
tion system of the type described can be designed so that
not more than full load-fuel quantity can be injected into
the engine cylinders, and so that the fuel spray charac—
teristics remain constant over a large range of engine
speeds‘. Formulas are pres'ented for computing the volume
of the reservoir and the diameter of the- discharge orifice.

Investigations are being conducted by the National
Advisory Committee for Aeronautics at Langley Eield, Va.,
to develop a-fuel-injection system for high~spoed compres—
sion—ignition engines which will.give the same injection
characteristics for a wide range of engine speeds. -Tho
requirements of such a system- have bee-n discussed in ref—
erence l.

. The tests. are being conducted on- th 3 fuel— injection
system of the N. A. C. A. spray photography- enuipment.
erence 2. ) This system is being used instead of one de—
signed for engine operation because it is particularly "
adaptable- to. test work. The injection. is caused by re-
leasing fuel under pressure from a reservoir through an'
injection tube to a discharge orifice, mounted either in
a plain holder or in an automatic injection valve. (Fig.
l.) The duration of injection is regulated by the time
2 fi.A.C.A. Te°§¥¥951.HQt9.H°@ 40?j

interval between the opening of .tho timing valve and the
opening of the by—pass valVQ. The operation ef the system
has been described in detail.