combustor outlet.
4. Expansion. By virtue of the internal com-
bustion process at elevated pressure a por-
tion of the heat energy is converted to
exhaust gas velocity. The gasses are
expanded into the atmosphere through the
combustor (E) with a velocity of over 160
MPH and a noticeable amount of thrust.
5. Entrainment. A second jet pump effect
is created by the exhaust gases as they
leave the combustor. The slot shaped outlet
of the combustor creates a large mixture
interface and promotes high volume entrain-
ment within an unusually short distance. The
exhaust gases transfer their heat and
momentum to the entrained air and thus cre-
ate a stream of high volume, low tempera-
ture air. This pumping effect is progressive,
i.e. as the distance from the combustor
increases so does the volume of air
entrained. Since the heat and momentum
are distributed over all the entrained air, the
temperature and velocity of the output
decrease as a function of distance away
from the gun.
Summary of Contents for 998
Page 1: ...Operating Field Maintenance and Parts Manual Model 998 ...
Page 7: ......
Page 9: ...V Operating Instructions ...
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