Chapter 13 Gas Turbine Power Plants

Although addition of the regenerator increases thermal efficiency
and hence fuel economy, there is no increase in the net
power output of the gas turbine plant; however, an increase in
net power output can be realized by reheating the gas at an intermediate
pressure and then allowing the reheated gas to finish ex-
Figure 13.6 Gas turbine power plant with regeneration and
power turbine
panding in the turbine. This method of increasing turbine power
will be considered next.
13.5 Brayton Cycle with Reheat
Reheating the gas involves dividing the turbine into two parts, a
high-pressure turbine and a low-pressure turbine. After the gas
passes through the high-pressure turbine it is extracted from the
turbine and admitted to a second combustor. Reheated gas flows
into the low-pressure turbine, which may be on a separate shaft,