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Page Title:
Compression and Power Stroke |
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 temperature and is undergoing pre-
combustion reactions.
(3) The main portion of the charge is pro-
gressively vaporized and swept off the
combustion chamber wall by the high
velocity rotary air swirl. The air swirl
was generated during the intake stroke
(par. b above). The vaporized fuel
burns smoothly in the spherical com-
bustion chamber as the fuel is swept
by the air swirl from the wall pro-
gressively over a period of time.
(4) The following successive portions of
fuel also undergo the same sequence of
events as they are spread first upon the
spherical combustion wall and then
gradually removed in vaporized form
by the combined action of air swirl and
the heat of the fire already in progress
in the spherical combustion chamber.
The air swirl continues to remove only
c. Compression and Power Stroke (figs. 13
through 15). On the upward movement (com-
mission stroke) of the piston the air swirl con-
tinues, raising the compressed air temperature
to between 900 and 1000 F. Near the top of the
compression stroke, 27 degrees before top
dead center (btdc), fuel is injected by the fuel
injector nozzle. A small amount (five percent)
of injected fuel is deposited as a thin film on
the walls of the spherical combustion chamber
in the head of the piston.
(1) This small amount of fuel charge is
atomized into the air space in the
spherical combustion chamber in the
head of the piston and functions as a
spark plug for the remainder of the
charge.
(2) During the ignition delay period, the
main portion of the charge is exposed
to a temperature below its cracking
6
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