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Module Development Konstantinos G. Kyprianidis 3.2 HERMES 3.2.1 Introduction HERMES is a software code developed by Cranfield University that has been integrated into TERA2020. It utilises a large amount of engine performance data as well as the engine weight and dimensions, all calculated upstream in the TERA2020 sequence, and can be used to: • Scale a nominal aircraft configuration to fit a new engine design using a rubberised wing aircraft model that is based on first-order accuracy rules. • Predict the block fuel for a given set of payload-range requirements for the entire flight mission including reserves. • Predict important performance parameters used for aircraft and engine de- sign, such as time to height and take-off field length for all engines operative and one engine inoperative conditions. Details on the use of HERMES within NEWAC TERA2020 have been given already in Chapter 2. 3.2.2 Code modifications The code is based on work carried out by Laskaridis et al. [50,51] on the predic- tion of aircraft performance; the aircraft modelling is largely based on the work presented in [98, 99]. For the needs of NEWAC TERA2020, the author had to perform a full reconstruction of HERMES. Major code modifications include: • Overhaul of the entire code including defragmentation, addition of object- oriented structures and scientific units control. • Complexity reduction step with respect to I/O operations. • Addition of aircraft component weight calculation routines to improve the rubberised wing aircraft model. 46PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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