随着飞机向高速、大负载的趋势发展,对于飞机垂直、短距起落的性能提出了迫切的要求。短距起落性能好的飞机,在城市近郊的小机场就可以起落,特别涡轮风扇发动机的发展,在客观上提供所需的动力源。 60年代,国外航空界开始将注意力集中在增升装置的研究上,把它作为飞机起降的一种增升措施, As the aircraft to high-speed, high-load trend, for aircraft vertical, short take-off and landing performance posed an urgent requirement. Good performance of short-range landing aircraft in the suburbs of the city can rise and fall of a small airport, especially the development of turbofan engines, objectively provide the necessary power source. In the 1960s, the aviation industry in the world started to focus on the research of the lifting devices and regarded it as an increasing measure for taking off and landing of aircraft.