航空公司在购买飞机选择动力装置时，主要考虑的是发动机的可靠性、经济性和价格。发动机经济性受多方面的因素影响，其中最主要的是发动机的维护成本和燃油成本。目前民用高涵道比涡扇发动机的巡航耗油率基本保持在相同水平，相互之间差别不大，而且世界上的航空燃油价格在最 The main consideration for airlines in purchasing aircraft for their choice of powerplant is the reliability, economy and price of the engine. Engine economy is affected by many factors, the most important of which are engine maintenance costs and fuel costs. At present, civil high-bypass ratio turbofan engine cruise fuel consumption remained basically the same level, with little difference between each other, and the world’s aviation fuel prices in the most