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Konstantinos G. Kyprianidis Assessment of core technologies and concepts Figure 6.15: T-S diagram for the selected intercooled recuperated core and con- ventional core cycles at mid-cruise conditions. 6.3.3 Performance assessment at aircraft system level For the results presented in Table 6.2, a year 2000 EIS turbofan engine with a conventional core was set up as the baseline. The intercooled recuperated engine on the other hand is an UHBR design with a year 2020 level of technology. The TERA2020 tool was used for performing the aircraft system level analysis, in a similar manner to the intercooled core assessment. The thermodynamic cycle at mid-cruise conditions for the selected intercooled recuperated core and conventional core cycles is illustrated qualitatively in the T-S plane in Fig. 6.15. Significant business case block fuel benefits of nearly 22% are predicted for the geared intercooled recuperated core engine due to its higher thermal and propul- sive efficiency. The use of HPT cooling air bled from the recuperator exit [88,97] results in a 1.3% SFC improvement due to more energy being recuperated from the exhausts, at a fixed effectiveness level - and despite the considerable increase in cooling air requirements (+3.5% of core mass flow). The predicted dry weight for the intercooled recuperated configuration is higher compared to the conven- tional core engine. There is a weight benefit from the use of EIS 2020 light-weight materials in most major engine components, as well as from the high speed LPT 145PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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