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Assessment of core technologies and concepts Konstantinos G. Kyprianidis Figure 6.1: Artistic impression of the intercooled core turbofan engine [32]. the HPT and IPT cooling flows were recalculated to maintain a fixed rotor blade metal temperature. The HPC pressure ratio was varied to maintain a fixed OPR. 6.2.1 Intercooling at OPR = 50 Some minor benefits in terms of SFC by introducing intercooling in a turbo- fan engine with an OPR of 50 are illustrated in Fig. 6.2 for constant (but not equal) turbomachinery polytropic efficiency levels and ideal intercooling i.e. no intercooler pressure losses in the cold and hot stream. As expected, maximising thermal efficiency benefits from intercooling requires a low IPC pressure ratio. For no intercooling, shifting pressure ratio from the IPC to the more efficient HPC can also improve SFC, but a more in-depth analysis could show that this benefit may be limited by HPT design constraints. Core size reduces and hence BPR increases considerably with increasing intercooler effectiveness, as illustrated in Fig. 6.3, in order to maintain the engine specific thrust and W2 constant; for a given OPR this can partially help compensate the intercooler weight penalty as will be discussed in the aircraft system level assessment section. 132PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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