民航大涵道比涡扇发动机总体性能参数敏感性分析

Sensitivity Research on Gross Performance of Civil AviationHigh Bypass-ratio Turbofan Engine

摘要:

基于Gasturb总体性能分析软件对民航大涵道比涡扇发动机高空巡航阶段的3个监控性能参数受5个气路部件效率影响的敏感性进行分析；研究发现高空巡航阶段高压压气机、高压涡轮的效率降低对排气温度影响较大,风扇、增压级和低压涡轮的效率降低影响稍小；五大气路部件的效率降低会带来排气温度、燃油流量的上升,而对高压转子转速则有正和负的效应,其中低压轴上的3个部件的效率降低会增加高压转子转速；而高压轴上的两个部件的效率降低会导致高压转子转速的下降,这与发动机以风扇转速作为被控参数的控制规律有关。

Abstract:

Sensitivity researches of three gross performance parameters of civil-aviation high bypass-ratio turbofan engine on five flow path components during cruising phase have been conducted based on Gasturb simulation software. It was found that during cruising phase,the efficiency of high-pressure compressor,high-pressure turbine have larger effect on Exhaust Gas Temperature(EGT),while the efficiency of fan、booster and low-pressure turbine have smaller effect on EGT. The reduction of the efficiency of five flow path components will lead to the rise of the EGT and fuel flow,as to the high pressure rotor speed,it has positive and negative effects.The reduction of the efficiency of the three parts on the low pressure shaft will increase the high pressure rotor speed,while the reduction of the efficiency of the two parts on the high pressure shaft can lead to the decrease of the high pressure rotor speed. It is related with the fact that fan rotating speed(N1) is chosen as control parameter.