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Konstantinos G. Kyprianidis Framework Development • Take-off T30 and other important performance parameters. • FAR take-off field length for all engines operating and balanced field length for one engine inoperative conditions. • Time to height. • LTO DpNOx/Foo vs. ICAO certification limits and CAEP medium and long term goals. • Cumulative EPNL vs. ICAO certification limits. • Engine time between overhaul. For example, during a block fuel optimisation all engine aircraft combinations which do not fulfil the take-off and time to height criteria set will be ignored as infeasible. Due to the underlying physics of the TERA2020 system, this will lead to an optimum engine and aircraft combination for the defined objective function. All large engines will produce heavier aircraft with more drag and thus higher block fuel weight. Engines which are too small will not deliver enough thrust to satisfy the take-off and time to height criteria. 2.4 Conclusion The research effort presented in this chapter focused on various aspects of the development of a multi-disciplinary aero engine conceptual design tool for assess- ing the impact of technology advancements on future turbofan engine emissions and direct operating costs. Firstly, a brief review of some conceptual design tools was carried out and the merits and shortfalls of such tools were discussed. The development of a new conceptual design tool, TERA2020, was presented; this work was based on lessons learned from previous efforts and considered the following disciplines: engine performance, engine aerodynamic and mechanical design, aircraft design and performance, emissions prediction and environmen- tal impact, engine and airframe noise, and production, maintenance and direct operating costs. The main findings can be summarised as follows: 29PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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