Improving Military Transport Aircraft through Highly Integrated Engine-Wing Design,
SOCIETE NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION PARIS (FRAN CE)
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Current studies have shown the interest of very large bypass ratio engines 10 BPR 14 to power Long Range Airliners, at cruise speed exceeding Mach 0.8. A further benefit in term of installed SFC can be expected for the Future Large Aircraft FLA, cruising at Mach 0.75. Compared to an equivalent turbofan, a very large bypass engine can deliver a higher thrust during take off, thus improving the high lift capability of the aircraft. Taking into account that a conventional front fan engine is likely to show a large Radar Cross Section RCS, and that this problem would have to be addressed for FLA, the engine preferred concept is a Ducted Aft Contrafan. The resulting high hub-tip ratio fan flow path, combined with slow rotating composite fan-blades is indeed a good approach toward reduction of the engine RCS. In order to minimize the extra-weight due to the long duct, a highly integrated engine-wing design is proposed, offering a reduced friction drag particular attention is paid to the maintenance and transportation problems.
- Transport Aircraft
- Jet and Gas Turbine Engines