THE GAS-TURBINE COOLING AT THE APPLICATIO N OF VARIOUS COOLING MEDIA

The potential development of the gas turbine as a key component of mod ern fossil power station engineering is not exhausted with the enginee ring of present-day serial engines. In the efforts for higher unit per formance at improved efficiency, higher turbine entrance temperatures are aspired, which, however, correspondingly increase the requirements on structural members. This opens up the question on the choice of a suitable cooling medium. It is of considerable reactive effect on the total process, whether the compressor air is recuperative-cooled or by injected water, or even by using steam as cooling medium. These relat ions are being investigated on the basis of a calculation model. One r esult indicates that the steam cooling in the open cycle, under the co nditions of the GDT-process (gas and steam turbine process), appears t o be highly suitable.