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Konstantinos G. Kyprianidis Framework Development aircraft design requirements. The specification of this new engine starts with a set of thrust requirements, a basic design concept and initial estimates of the po- tential performance available from each major component and system. The next step is to construct design and off-design performance models. Major components are then sized and the gas path annulus is defined. Iterative design studies and assessments are then undertaken to refine the performance model and to com- plete a preliminary mechanical design for the engine. The nacelle lines can then be drawn and the overall powerplant weight and drag can be assessed [57]. More details on the preliminary design process are given by Halliwell [58], Kurzke [59] and Kyritsis and Pilidis [60]. This process relies on the experience of the preliminary design team to produce realistic physical and functional models. Each new engine design builds on ones that have gone before. When new or improved technologies are invoked they are initially modelled on the basis of target levels of performance and target space envelopes and weights. As the research activities raise the TRL (Technology Readiness Level) of each technology, so improved component efficiency estimates become available and can be used to refine the whole-engine models. In estimat- ing effects at the whole aircraft level, exchange rates are initially used for the effects of changes in specific fuel consumption, engine weight and nacelle drag on the aircraft’s takeoff weight and fuel burned [57]. 2.3.2 The developed framework TERA2020 is a software tool that helps to automate part of the aero engine design process. The tool spans typical aero engine conceptual design and pre- liminary design, featuring a sophisticated explicit modular design, as illustrated in Fig. 2.3, addressing major component design as well as aircraft system level performance. Individually developed modules are integrated together in an optimiser environ- ment; a large amount of information is available after every design iteration and can be used for many purposes such as technology impact assessment, sensitivity and parametric studies, multi-objective optimisation etc. The selected modular design architecture leads to important system advantages such as: 19PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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