航空发动机推力控制系统喘振裕度影响分析

摘要

由于补偿引入喘振裕度限制,引起发动机推力损失.为了最大程度地提高推力控制系统下的发动机性能,提出了喘振裕度对涡扇发动机推力控制系统影响的研究.针对某型涡扇发动机分段线性化模型建立了推力控制系统,并设计了喘振限制保护器.通过发动机模型数据进行推力-转速的估计值与实际值平衡点实时加权计算,设计了外环推力估计回路,并通过合理的调度逻辑完成推力控制系统的变增益PI控制.仿真结果表明:采用的加权预估方法能够有效地估计推力并跟踪设定的期望推力,实现最大程度的推力损失补偿.对不同高压压气机喘振裕度进行仿真分析,结果表明,整个推力控制系统可以在合理的喘振裕度限制下,保证发动机安全工作且能够实现有效地推力控制.通过在一定范围下调整喘振裕度限制幅度,能够提高发动机推力的响应时间,为后续研究航空发动机喘振裕度限制范围起到了重要作用.%In order to compensate thrust loss of a deterioration turbofan engine and improve the level of performance of the thrust control system,an analysis of surge margin impact on turbofan engine thrust-setting control was conducted.Based on an unnamed low-bypass mixed exhaust turbofan engine's component-level model,a thrust control system was designed with steady state control,acceleration/deceleration schedules and surge margin limit logic.Then an outer thrust loop was investigated based on the weighted estimates.And through the reasonable scheduling logic,the variable gain PI control of thrust control system was accomplished.The simulation results indicate that the method of neural network of time delay feed-forward can effectively estimate the values of thrust,track the set expectations,and compensate the thrust loss at greatest degree.Under the reasonable surge margin limit,the control system can ensure the safety of engine working and achieve effectively thrust control.Through decreasing the range of surge margin limit,we can increase the thrust response time and improve the engine performance.The in-depth study plays an important role in researching the range of engine surge margin limits.