(b) Pressure. A second component required in the acceleration
principle is pressure, or driving force. To attain this pressure, container 2
(Figure 117) is heated and the molecules contained within expand and exert
pressure equally in all directions.
(c) Accelerated Mass. An accelerated mass is obtained by funneling
the pressurized gas down a narrow passageway (container 3). It is this
convergency or narrowing down of the nozzle area that causes the molecules to
accelerate and produce that velocity energy required to perform the rotational
mechanical work.
(d) Conversion of Energy. The high velocity gases possess a large
amount of kinetic energy. This energy due to motion now must be converted to
mechanical energy, which can be accomplished by adding a turbine wheel to
container 4 (Figure 117). The first force, as seen in the illustration, is
the impact or push of the highvelocity gases exiting the nozzle and hitting
the turbine wheel. The second force, which is a reaction force, is generated
by the highvelocity gases exiting the turbine wheel in the opposite direction
of rotation.
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OD0610
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