飞机设计导论第三章.ppt

* Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 * Introduction to Aircraft Design 第*页 3.2.1 Passenger aircraft Supersonic airliner is faced with an even more severe problem of noise. It was possible to reduce the take-off and landing noise of Concorde to those of contemporary jet aircraft at its service-entry date,but unacceptable for any other future supersonic aircraft. A further problem is that the noise produced by the sonic boom. Over-sea portion supersonic flight restriction. * Introduction to Aircraft Design 第*页 3.2.1 Passenger aircraft Future Supersonic Transports (SST) are likely to follow this pattern and to use variable-cycle engines. Such engine s will be relatively quiet turbo-fans on take-off, but have reduced by-pass ratio for increased fuel efficiency at the likely cruise M 2.0 to 2.5. New project designs should triple Concorde’s 100 seat payload, and provide trans-Pacific range. Regional aircraft are a crucial part of the aerospace business. They may be divided into 3 categories. * Introduction to Aircraft Design 第*页 Regional aircraft The largest carry 70~130 passengers with range of up to 2000km. Turbo-fan engine. Mid-range regional aircraft are usually powered by turbo-props and carry 40~70 passengers. SAAB 2000 is a successful mid-range turbo-prop. Smaller regional aircraft vary in capacity between 18 and 40 passengers, and most use turbo-prop engines. They do not require high speed, so externally braced wings and fixed landing gears may be used as for the Cessna Caravan. * Introduction to Aircraft Design 第*页 3.2.2 Business and executive aircraft Senior executives felt themselves to be limited by the infrequent