Page 344 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Gas Turbine Best Practices Be st Practice 6.1

Fig 6.1.1 A gas turbine vs. a steam turbine. Left: Steam turbine (Courtesy of General Electric Co.). Right: Mars gas turbine (Courtesy of Solar Turbines,
Inc.)

Fig 6.1.2 Comparison e gas turbine vs. steam turbine cycles

is the case for the automotive engine. Both engines have com- with the addition of a combustor that produces the hot gas for
pression, combustion and exhaust sections. When one considers expansion. Figure 6.1.4 presents these facts.
the similarities of these engines in this manner, it can be seen Figure 6.1.5 shows a gas turbine configuration for a gas
that both require starters, ignition sources, inlet air filters, inlet turbine with a regenerator. The function of the regenerator is to
fuel systems, cooling systems, and monitoring systems. use gas generator exhaust vapors to preheat the air exiting the air
compressor, thus reducing the amount of fuel required by the
Building a gas turbine gas turbine. Figure 6.1.5 also shows the changes of gas tem-
perature, pressure, energy, and the horsepower produced in the
We have already discussed turbo compressors and expansion different sections of the gas turbine. Note that the power
turbines. A gas turbine is a combination of these components, produced in a gas turbine is typically three times the output

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