自适应变循环发动机性能优势评价方法

Performance Advantage Evaluation Method of Adaptive Variable Cycle Engine

为了综合评价自适应变循环发动机相比常规涡扇发动机的性能优势,提出了从发动机耗油率降低和质量增加2个维度以及从发动机耗油率、飞机燃油消耗量和燃油效率之间关系的角度来评价自适应变循环发动机性能的2种方法。结果表明:发动机耗油率降低和质量增加之间存在某个平衡点,只有质量增加幅度小于耗油率降低幅度时,才能体现自适应变循环发动机的性能优势,并且飞机航程越长,越能体现自适应变循环发动机耗油率降低带来的优势;发动机耗油率、飞机燃油消耗量和燃油效率之间呈指数关系变化,当假设飞机巡航航程为3500 km、飞机升阻比为10.5时,自适应变循环发动机巡航耗油率相比常规涡扇发动机的降低1%,可使飞机燃油消耗量减少约1.9%,飞机燃油效率提高约2.4%。

In order to comprehensively evaluate the performance advantages of adaptive variable cycle engines compared with conventional turbofan engines,two methods for evaluating the performance of adaptive variable cycle engines were proposed from two dimensions of engine specific fuel consumption reduction and mass increase and the perspective of the relationship between engine specific fuel consumption,aircraft fuel consumption and fuel efficiency.The results show that there is a balance point between the decrease of engine specific fuel consumption and the increase of engine mass.Only when the increase of mass is less than the decrease of specific fuel consumption can the performance advantages of adaptive variable cycle engine be reflected.The longer the flight,the better the advantages of the reduced specific fuel consumption of the adaptive variable cycle engine.The relationship between engine specific fuel consumption and aircraft fuel consumption and fuel efficiency is exponential.Assuming that the aircraft cruise range is 3500 km and the lift-to-drag ratio is 10.5,the cruise specific fuel consumption of adaptive variable cycle engine can be reduced by 1%compared with that of the conventional turbofan engine,which can reduce the aircraft fuel consumption by about 1.9%and increase the aircraft fuel efficiency by about 2.4%.