某型涡扇发动机分段线性化模型的建立

基于某型涡轮风扇发动机非线性动态模型,建立并实现了该发动机的分段线性化模型.介绍了拟合法建立涡轮风扇发动机线性状态空间模型的建模方法,并以发动机高压转子转速为参考参数选取发动机的稳态工作点,分别求取了这些工作点处的线性状态空间模型.以这些线性状态空间模型为基础,在Simulink仿真平台下,采用S-function模块建立了分段线性化发动机模型,并实时地对模型进行求解,得到所需要的高低压转子转速、涡轮落压比以及燃烧室温度等发动机参数.分段线性化模型与非线性模型的仿真结果比较表明此种建模方法输出精度高,能够很好的反映该型发动机的特性.

Turbofan Engine Modeling of Piece-wise Linear Model

Based on the non-linear turbofan engine model,a piece-wise linear model was established.Fitting method was presented to establish the linear models of the turbofan engine on selected operating points.Then a piece-wise linear model was obtained with these linear models in Simulink environment where a S-function module was adopted to reserve the import parameters of the engine,such as the spool speed,turbo pressure,chamber temperature,etc.The comparison of the results between nonlinear model and piece-wise linear model proves that the piece-wise linear model can accurately reflect the engine performance.