Some characteristics of fuel sprays at low-injection pressures Page: 2 of 16
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NAA T hnicau l Ur
3 1176 01425 5633
NATIONAL ADVISORY COMMITTEE FOR.AERONAUTICS
TECHNICAL NOTE NO. 399
SOME CHARACTERISTICS OF FUEL SPRAYS AT
LOW-INJECTION PRESSURES
By A MU. RothroQk and C. D. Waldron
Summary.
This report presents the.results of tests conducted
at the Langley Memorial Aeronautical Laboratory, Langley
Field, Va., to determine some of the characteristics of
the fuel sprays. obtained from an 0.008-inch and a 0.020-
inch open nozzle when injection pressures from 100 to 500
pounds per square inch were used. Fuel oil and gasoline
were injected into air at densities of atmospheric and
0.325 pound per cubic foot.
It was found that the penetration rate at these low
pressures was about the same as the rate obtained with
higher pressures. Spray cone-angles were small and indi-
vidual oil drops-were visible in all the sprays. Gasoline
and fuel oil sprays had similar characteristics.
Introduction
Interest has recently been shown in spark-ignition
engines using gasoline or Diesel oil and having the fuel
injected into the inlet manifold or into the engine cyl-
inder during the suction and compression stroke when the
air density is low. Since in this type of engine injec-
tion pressures of several thousand pounds per square inch
are not required to give the necessary fuel spray penetra-
tion with round-hole orifices, a low-pressure injection
system could be used, provided that the low-injection
pressure gave sufficient atomization and dispersion of
the fuel spray. Consequently, it seemed desirable to in-
vestigate the characteristics of the sprays produced with
low-injection pressures. To do this, several series of
high-speed motion picturesof such sprays were obtained
at the Langley Memorial Aeronautical Laboratory, Langley
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Rothrock, A. M. & Waldron, C. D. Some characteristics of fuel sprays at low-injection pressures, report, November 1931; (https://digital.library.unt.edu/ark:/67531/metadc54059/m1/2/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.