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its’ density diminishes. The swirl centrifuges the unburned, heavier portion
outward and thereby creating a blanket of cold mixture along the walls. As
combustion proceeds, the process draws from the protective layer of unburned
mixture, and when combustion is completed the cooling effect stops. The size of
the combustor ensures that for rated flow the point of completion coincides with
the outlet. Operating at less than rated pressure, the blanket of unburned mixture
does not extend all the way to the outlet and results in a red hot combustor outlet.
4. Expansion. By virtue of the internal combustion process at elevated pressure a
portion 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 entrainment within an unusually
short distance. The exhaust gases transfer their heat and momentum to the
entrained air and thus create a stream of high volume, low temperature air.
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