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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。
Engine thrust loss is caused due to compensation introducing surge margin limitations. In order to maximize the engine performance under the thrust control system, the research on the influence of surge margin on the thrust control system of turbofan engine is proposed. A thrust control system was established for the segment linearization model of a turbofan engine. The surge limit protector was designed. Thrust-speed estimation and actual value balance are calculated in real time through engine model data, and the outer loop thrust estimation loop is designed. And the variable gain PI control of thrust control system is completed through reasonable scheduling logic. The simulation results show that the weighted estimation method can effectively estimate the thrust and track the set expected thrust to achieve the maximum thrust loss compensation. The simulation analysis of the surge margin of different high-pressure compressors shows that the whole thrust control system can ensure engine safety and achieve effective thrust control under the reasonable limit of surge margin. By adjusting the limit of surge margin within a certain range, the response time of engine thrust can be increased, which plays an important role in the subsequent study of the limit range of aero-engine surge margin.