部件老化对大涵道比涡扇发动机性能影响仿真

Simulation of Component Deterioration Effect on Performance of High Bypass Ratio Turbofan Engine

为研究部件老化对大涵道比涡扇发动机性能的影响,在分析压气机、涡轮部件老化因素的基础上,建飞行循环数相关联的部件特性修正模型。结合部件匹配方法,建立了分析部件老化对大涵道比涡扇发动影响的计算模型,并采用Newton-Raphson方法求解其构成的非线性方程组。以某大涵道比涡扇发动机量地分析了8个典型工况下部件老化对发动机推力、耗油率等性能参数的影响。计算结果表明,当该型发到返修状态时,部件老化导致其推力下降7.29%,耗油率上升8.23%,排气温度上升68.3K,同时大幅降定裕度。

For assessing the component deterioration effects on a high bypass ratio turbofan engine, the component characteristic correction model associated with flight Cycles is established based on the analy sis of compressor and turbine components deterioration factors. Combined with component matching method, the simulation model analyzing component deterioration effect on a high bypass ratio turbofan engine is established, and NewtonRaphson method is adopted to solve the nonlinear equations. Taking a high bypass ratio turbofan engine for example, component deterioration effect on engine performance parameters such as engine thrust and special fuel consumption are quantitativly analyzed under 8 typical operation conditions. Results show that when the engine reaches the renovates sate, component deterio ration lowers the thrust by 7.29%, increases the special fuel consumption by 8.23%, increases the en gine gas temperature by 68.3 K, and reduces the surge margin significantly.