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System uncertainty due to thermo-fluid modelling Konstantinos G. Kyprianidis Figure 4.17: Percentage deviations of isobaric heat capacities calculated for dry air considering real gas behavior from values considering an ideal gas mixture (adapted for novel cycles from [183]). 4.10 Validity of the ideal gas assumption The assumption of real gas is rarely used for aero engine calculations i.e. Cp being a function of temperature and pressure. In most gas turbine performance codes, the assumption of ideal gas (sometimes also referred to as half-ideal) is used i.e Cp being only a function of temperature. Temperatures and pressures in the gas path will typically be calculated using the enthalpy and entropy relations presented earlier in [88]. For teaching purposes often the assumption of perfect gas will be made i.e. Cp being constant. A comparison of the calculated values of isobaric heat capacity assuming a real gas from values obtained considering an ideal gas - performed for a range of temperatures and pressure of dry air - is presented in Fig. 4.17 (continuous black lines). Compression lines for normal and intercooled cycles have been plotted for ISA (International Standard Atmosphere) SLS (Sea-Level Static) conditions; the ideal isothermal compression line has also been included. The plotted dashed lines in this chart are compression lines of dry air for a polytropic efficiency of 90% and various ambient temperatures. For current and future novel propulsion cycles the following trends are illustrated 102PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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