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针对高空长航时无人机的动力性和安全性要求,首先应用MATLAB/Simulink对某型一级航空活塞发动机涡轮增压系统建立联合仿真模型.模型主要分为四部分:涡轮增压器模型、发动机平均值模型、中冷器模型和废气阀模型,并根据实验数据对仿真结果进行了校核,确保模型的可行性.在此基础上从整个系统的角度出发研究活塞发动机涡轮增压系统的安全边界,通过发动机级的安全边界要求给出增压器级的安全要求,同时分析主要参数对系统安全性的影响.最后,建立基于安全边界的废气阀的调节规律,使整个活塞发动机涡轮增压系统运行在安全边界之内.结果表明:基于模型的活塞发动机涡轮增压系统的安全边界研究方法给可以给出系统安全运行边界,同时可以在保证安全的前提下为下一步改善发动机涡轮增压系统的性能提供依据,进一步在设计阶段确保系统的安全性.
In order to meet the requirements of dynamic and safety of UAV at high altitude, a co-simulation model is established for the first-class aero-engine turbocharger system using MATLAB / Simulink.The model is divided into four parts: the turbocharger model , The average engine model, the intercooler model and the exhaust valve model, and the simulation results were checked according to the experimental data to ensure the feasibility of the model.On the basis of the whole system, the research of the piston engine turbocharger system The safety requirements of the supercharger stage are given through the engine-level safety margin and the influence of the main parameters on the safety of the system is also analyzed.Finally, the regulation of the exhaust valve based on the safety margin is established so that the entire piston engine turbine The results show that the model-based approach to the safety margin of a turbocharged system of a piston engine gives a safe operating margin for the system and at the same time can be used to improve the safety of the engine turbine The performance of the pressurized system provides the basis for further system safety during the design phase.