发动机加力喘振故障原因仿真分析

Simulation and Analysis of Cause for Augmented Engine Surge

某型带加力涡扇发动机多次出现风扇加力喘振故障,对飞行安全和发动机寿命产生严重影响。为了分析加力喘振故障原因,首先通过发动机稳态计算模型分析了喷口控制系统稳态特性与加力喘振故障之间的关系,指出了加力工作线位置与风扇喘振的关系;其次根据基于AMESim的加力喷口控制系统模型和基于Simulink发动机分段线性化模型构建了联合仿真模型,基于联合仿真模型分析了喷口控制系统动态特性与加力喘振故障之间的关系,同时分析了喷口打开速度对于风扇喘振裕度的影响。

Fan surge often occurred to an augmented turbofan engine,which has serious effects on the aircraft safety and engine lifetime. In order to analyze the cause of engine surge,the relationship between steady-state performance of the nozzle control system（ NCS） and fan surge is analyzed via the steady-state engine model,and the relationship of the position of augmented operation line and low-pressure operation line is studied. Besides,the co-simulation model is constructed through the NCS model in AMESim environment and the piecewise linear model in Simulink,and the relationship between dynamic-state performance of the NCS and fan surge is studied based on the co-simulation model,and the effects of the speed of nozzle area changing on fan surge margin are also analyzed.