轴流压气机大小叶片气动弹性稳定性分析

分别采用能量法和时域法对轴流压气机大小叶片进行了气动弹性稳定性分析，获得了叶片的气动模态阻尼比和叶片表面的非定常气动功分布.对叶片的振动位移响应进行了频域分析，并与常规设计转子作了对比.结果表明:大小叶片存在的结构失谐和气动失谐对气动弹性稳定性有明显的影响.气动失谐改善了叶片表面的非定常气动功分布，结构失谐改变了叶间相位角的影响.大小叶片对应的1阶模态振型的气动模态阻尼比为0.000791，而常规设计转子的值为0.000217，大小叶片相对于常规设计转子，不仅改善了气动性能，同时还提高了气动弹性稳定性. 

Aero-elastic stability analysis of an axial compressor with splitter rotor

The aero-elasticity of an axial compressor with splitter rotor was investigated by employing energy method and time-domain method. The aerodynamic modal damping ratio of blade and unsteady aerodynamic work distribution on the blade surface were obtained while the frequency domain analysis of blade vibration displacement were made; the conventionally designed rotors and the splitter rotor were also compared. The results show that the structural mistuning and aerodynamic mistuning had significant positive effects on the aero-elastic stability of the system. Aerodynamic mistuning improved the unsteady aerodynamic work distribution on the blade surface and the structural mistuning weakened the effect of interblade phase angles. For the first vibration mode, aerodynamic modal damping ratio (AMDR) of the splitter rotor has the value of 0.000791, and that of conventionally designed rotors have the value of 0.000217.Therefore,the structure of the splitter rotor not only has a better aerodynamic performance, but also enhanced the aero-elastic stability.