Energy is added
to the gas stream in the combustor, where fuel is mixed with air and ignited.
In the high pressure environment of the combustor, combustion of the fuel
increases the temperature. The products of the combustion are
forced into the turbine section. There, the high velocity
and volume
of the gas flow is directed through a nozzle over the
turbine's blades, spinning the turbine which powers the compressor and, for
some turbines, drives their mechanical output. The energy given up to the
turbine comes from the reduction in the temperature and pressure of the exhaust
gas.
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