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Geared turbofan Open rotor Each draws on the competences and facilities of the major European aero engine manufacturers including Britain’s Rolls-Royce, France’s Snecma and Germany’s MTU. There is a focus within SAGE on innovative product architectures, in particular ones that offer opportunities for step-change reductions in CO2 emissions, relative to the current generation of turbofan engines powering narrow body and regional aircraft like the Airbus A320 and the Boeing 737. The two most innovative architectures being employed in SAGE are to be found on the geared turbofan (GTF) and open rotor engines. MTU of Germany is leading SAGE’s geared turbofan (GTF) technology demonstrator engine programme. It is based on an already certified engine, Pratt & Whitney’s PW1100G geared fan which is just entering service on the Airbus A320NEO aircraft family (A319NEO, A320NEO, A321NEO). The geared fan engine features a reduction gearbox located between the fan at the front of the engine and the low pressure turbine that drives it. On a conventional turbofan engine the two are directly connect via a shaft. With the addition of a gearbox, the conventional turbofan engine becomes a geared fan engine. The gearbox spins the fan at a much slower speed than the low pressure turbine. The ratio is about 3:1. This allows both sections of the engine to run at their optimum. Although the inclusion of a gearbox produces a weight penalty, the overall result is a much more efficient engine giving lower fuel consumption and lower emissions. The Pratt and Whitney PW1100G engine is expected to be 11per cent more fuel efficient than the engines it replaces. Developments being carried out as part of SAGE involve principally the high pressure compressor and the low pressure turbine modules. They are designed to improve relevant technologies in order to significantly reduce fuel burn and therefore emissions still further. They 5PDF Image | Sustainable and Green Engine (SAGE) Aircraft Engine of the Future
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