飞机早期的动力装置采用的是活塞式发动机,随后不久又出现了涡轮喷气发动机,但涡轮喷气发动机的主要缺点是耗油率较高。60年代初,美国提出发展三军通用多用途发动机的主张。这种发动机不仅要求其在起飞,加速和超音速飞行方面具有良好的推力特性,而且对降低耗油率也提出了更高的要求。在这种思想 Early aircraft powerplant piston engine used, followed by turbojet engines, but the main disadvantage of turbojet engine is higher fuel consumption. In the early 1960s, the United States put forward the proposal of developing a general multi-purpose engine of the armed forces of the Armed Forces. This engine not only requires good thrust characteristics in takeoff, acceleration and supersonic flight, but also places higher demands on fuel economy. In this thinking