涡扇发动机起动过程气动稳定性的数值计算

1引言国内外发表的关于燃气涡轮发动机起动过程的研究论文很少涉及燃气涡轮发动机起动过程气动稳定性的研究1~3]。由于起动过程发动机的共同工作线非常靠近喘振线,起动极易诱发发动机出现失速或喘振现象,因此,有必要对燃气涡轮发动机起动过程的气动稳定性问题进行深入的研究。

Computation and assessment of aerodynamic stability of turbofan engine startup and acceleration

Based on component matching principles and by through solving unsteady state continuum equation, momentum equation and energy equation, one dimensional mathematical model was developed for aerodynamic stability assessment of turbofan engine startup and acceleration. With this model, aerodynamic stability of startup of small turbofan engine for missile was simulated. Effects of startup method and flight conditions on aerodynamic stability of turbofan engine startup and acceleration were given. According to model results and comparison with flight test data, it is found that the model developed could be used to compute aerodynamic stability during turbofan engine startup.