FLUID DATA PRESENTATION FOR GAS-TURBINE PERFORMANCE CALCULATIONS USING TABLES

Modern performance calculation programs have to be able to simulate th e performance of stationary and aero gas turbines over a wide range of application. Increasing cycle pressures and temperatures as well as n ew fuels especially require an appropriate fluid data modelling. In th is paper a method is presented to provide fluid data for performance c alculations with special regard to computation time and general applic ability to a great variety of different fluids and to a wide range of pressures and temperatures. The thermodynamic variables of state speci fic enthalpy and specific entropy and the gas constant necessary to de scribe the behavior of the fluid are tabulated over pressure, temperat ure and one parameter characterizing the fuel air ratio. The usage of the tabulated data in performance calculations is discussed. The fluid data were calculated for standard dry air and combustion gases result ing from dry air and hydrocarbon fuel or hydrogen fuel respectively. F or the calculations the constant composition model and the equilibrium model were used. The tabulated data are discussed concerning the phys ics and additionally the differences between the two fluid models are shown for a typical application emerging from performance investigatio ns for aero gas turbines.