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Assessment of core technologies and concepts Konstantinos G. Kyprianidis Figure 6.10: LPT variable geometry benefits for an intercooled recuperated aero engine. in terms of expected component efficiencies and weights, and is also based on 3-shaft layout. 6.3.1 Variable geometry High thermal efficiency for an intercooled recuperated aero engine depends on high levels of heat transfer in the recuperator; this in turn requires high tem- perature levels at the recuperator inlet, which at cruise conditions implies the use of high T4 levels. An aero engine however also needs to maintain high lev- els of thrust at certain operating conditions, such as TOC and T-O. Off-design effects would typically dictate an engine design with reduced T4 levels at cruise conditions, in order to maintain acceptable levels of HPT metal temperature at high power conditions. Therefore, the use of variable geometry in the LPT of an intercooled recuperated aero engine presents significant SFC benefits. The idea of varying the inlet guide vane nozzle area in the LPT has been discussed in detail by Boggia and Rud [97] and Walsh and Fletcher [88], but has not been quantified. An attempt to quantify these benefits for an engine design optimised for long haul applications is presented in Fig. 6.10. As can be observed, 140PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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