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70 Integrated system design Table 4-3: Components figures of merit for aircraft turbine engines with level of technology 4 (produced since the year 2005) [9] Component Compressor Fan Turbine (cooled) Combustion chamber Figure of merit Value eCM 0.90 eFN 0.89 eTR 0.90 ηCC 0.999 This relation valid until 11000 m. The temperature of the air at an altitude H is TH = TREF + κH, (4-21) (4-22) where P0 stands for the reference pressure, with a value of 101325 Pa, R is the air gas constant, 287 m2/(s2K), and g is the gravity constant, 9.8 m2/s. Once the pressure and temperature are calculated, the rest of the properties are obtained by means of the computational fluid library used so far. Fan side analysis The thermodynamic analysis of the turbofan is done in two steps (fan side and core side). This section deals with the fan side, whose T-s diagram is shown in Figure 4-3. Recall that where TREF is the reference value of 288 K at 0 m. The pressure is calculated as −g P =P T0+κH Rκ, H 0 T0 Figure 4-3: Schematic T-s diagram of the fan side of a turbofan engine. the numbering corresponds to the stations indicated in Figure 4-1. Since the diffuser is taken as ideal, the total enthalpy and pressure at the inlet of the engine (00) are the same at the inlet of the compressor (02). Likewise, the nozzle is also considered to be ideal and the total enthalpy and pressure at the outlet of the fan (013) are the same at the outlet of the nozzle (019). It is assumed that the nozzle expands the air to the environmental pressure, i.e., P19 = P0. Although the pressure ratio of the fan is an unknown, both the velocities at the J.S. Bahamonde Noriega Master of Science ThesisPDF Image | Design method for s-CO2 gas turbine power plants
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