某型涡扇发动机喷口控制系统数控改造方案设计

Design of Digital Control Transformation Scheme for Nozzle Control System of a Turbofan Engine

某型涡扇发动机采用的机械液压控制系统的喷口控制系统质量大、结构复杂、控制性能有限,在加力时产生一系列故障问题。在对原机械液压式喷口控制系统进行分析的基础上,提出对应的数控改造方案,建立仿真模型,并对此喷口数字电子控制系统进行仿真测试。结果表明:数控系统在发动机加力比变动的情况下,可以实现对喷口面积的有效控制,比原机械液压系统具有更好的控制品质,且对于不同的飞行条件也具有一定的适应性。

The mechanical hydraulic control system was used in a turbofan engine.The nozzle control system was not only large in mass,complicated in structure,limited in control performance,but also with a series of fault problems during after burning process.On the basis of the analysis of the original mechanical hydraulic nozzle control system,the corresponding digital control modification scheme was put forward,the simulation model was established,and the digital electronic control system of the nozzle was simulated and tested.The results show that the digital control system can effectively control the nozzle area under the condition of engine afterburning ratio change,which is better than that of the original mechanical hydraulic system,and has certain adaptability to different flight conditions.