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Introduction Konstantinos G. Kyprianidis emissions legislation scenarios, emissions taxation policies, fiscal and air traffic management environments. Within the European collaborative project VITAL (enVIronmenTALly friendly aero engines) [3], key low pressure spool technologies for three different turbofan architectures are being investigated, targeting step reductions in engine CO2 and noise emissions. As part of the VITAL effort, a number of universities cooperate on establishing a platform for multidisciplinary system analysis, the TERA2020 environment. The tool is targeted towards identifying an appropriate design space where more complex and time-consuming tools could be utilised; it is capable of evaluating the technology progress achieved within the project on engine/aircraft system level as well as performing scenario studies of next generation turbofan engines. The activities within the VITAL project specifically target year 2020 entry into service, thus the acronym TERA2020. Within the European collaborative project NEWAC (NEW Aero engine Core concepts) [4], enabling technologies are also researched for four new engine core concepts and three different lean-burn combustion concepts, with the objective of improving core thermal efficiency and reducing NOx emissions. The TERA2020 tool from VITAL, is being developed further to assess the economic and envi- ronmental impact of the new technologies being researched in NEWAC and to undertake sensitivity and optimisation studies about the new engine configu- rations. New technologies researched under the umbrella of NEWAC include: intercooling, intercooling with recuperation, improved compressor blade aerody- namic design and blade tip rub management, aspirated compression systems, active control of compressor surge and tip clearance, and active control of a cooled cooling air system. 1.2 Fuel efficient aero engine designs CO2 emissions are directly proportional to fuel burn, and therefore any effort to reduce them needs to focus on improving fuel consumption. Fuel burn for a turbofan engine can typically be improved by: 1. Reducing engine weight and size. 2. Reducing engine Specific Fuel Consumption (SFC). 2PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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