In the paper a calculation methodology of isentropic efficiency of a compressor and turbine in a gas turbine installation on the basis of polytropic efficiency characteristics is presented. A gas turbine model is developed into software for power plant simulation. There are shown the calculation algorithms based on iterative model for isentropic efficiency of the compressor and for isentropic efficiency of the turbine based on the turbine inlet temperature. The isentropic efficiency characteristics of the compressor and the turbine are developed by means of the above mentioned algorithms. The gas turbine development for the high compressor ratios was the main driving force for this analysis. The obtained gas turbine electric efficiency characteristics show that an increase of pressure ratio above 50 is not justified due to the slight increase in the efficiency with a significant increase of turbine inlet combustor outlet and temperature.

JO - Archives of Thermodynamics L1 - http://www.journals.pan.pl/Content/105639/PDF/02_paper.pdf L2 - http://www.journals.pan.pl/Content/105639 IS - No 4 EP - 35 KW - gas turbine KW - polytropic efficiency KW - isentropic efficiency ER - A1 - Kotowicz, Janusz A1 - Job, Marcin A1 - Brzęczek, Mateusz A1 - Nawrat, Krzysztof A1 - Mędrych, Janusz PB - The Committee on Thermodynamics and Combustion of the Polish Academy of Sciences JF - Archives of Thermodynamics SP - 19 T1 - The methodology of the gas turbine efficiency calculation UR - http://www.journals.pan.pl/dlibra/docmetadata?id=105639 DOI - 10.1515/aoter-2016-0025