准确的动态模型是进行涡扇发动机优化控制的基础,在分析发动机动态建模两类方法的基础上,选择部件特性建模方法,建立了民航大涵道比涡扇发动机的稳态及动态模型.研究发现发动机加减速时要受到压气机喘振、燃烧室熄火,燃烧室出口温度过高等方面的限制;双转子涡扇发动机加速时高压压气机喘振裕度变小,而减速时低压压气机喘振裕度变小.转子转动惯量的增加会导致发动机动态性能的恶化,在发动机设计时应尽可能通过材料选取来降低轴系的转动惯量.通过对动态响应的对比分析,结果显示动态模型具有较好的准确性.
Accurate dynamic model is the basis for optimal control of turbofan engine.On the basis of analyzing two methods of engine dynamic modeling,we selected components characteristic modeling method (CCM),and established a steady-state and dynamic model of civil aviation high bypass ratio turbofan engine.The study found that the engine's acceleration and deceleration subject to the restrictions of compressor surge,combustion chamber flameout and high outlet temperature of combustion chamber.Double-rotor turbofan engine's acceleration can cause that high pressure compressor surge margin becomes smaller,while deceleration can cause that low pressure compressor surge margin becomes smaller.The increase of moment of rotor inertia can lead to the deterioration of the dynamic performance of the engine.In the engine design,it is possible to reduce the moment of inertia by selecting the material as far as possible.Through the comparative analysis of the dynamic performance,the results show that the dynamic model has good accuracy.