摘要
传统叶片颤振分析多是基于单转子研究模型,发动机的紧凑性要求导致级间距减小,多排耦合作用对颤振的影响将不容忽视。采用自行开发的程序对某型1.5级高压压气机进行了流固耦合数值模拟,分析上、下游叶排对转子叶片颤振特性的影响。针对典型工况,分别进行了单转子模型,导叶转子模型,转子静子模型,导叶转子静子模型的叶片气动弹性稳定性分析。研究表明,激波振荡对颤振特性影响显著;多排环境下存在非定常压力波的反射和叠加,明显改变转子叶片表面的非定常压力幅值和相位,进而改变转子叶片气动弹性稳定性。多排干涉作用提高了转子叶片的气动阻尼,尤其是上、下游叶排同时作用时阻尼提高了近732.7%。
Conventional blade flutter analysis is normally based on an isolated blade row model,the influence of multi-row aerodynamic coupling on blade flutter characteristics can＇t be ignored when rotor-stator gaps decrease due to aeroengine compact requirements. A fluid-structure coupled simulation for a 1. 5 stage HPC was conducted with a selfdeveloped algorithm to analyze the influence of upstream and downstream blade rows on rotor blade flutter characteristics.Aiming at a typical operation condition,rotor blades＇ aeroelastic stability analyses were performed with an isolated rotor model,an IGV-rotor model,a rotor-stator one and an IGV-rotor-stator one,respectively. The results showed that the shock wave vibration influences the flutter stability significantly; there are reflection and superposition of unsteady pressure waves under the multi-row environment,the amplitude and phase of unsteady pressures on the rotor blade surface are changed obviously and furthermore the blade aeroelastic stability is changed; multi-row interferences raise the aerodynamic damping of rotor blade,especially,when the upstream and downstream blade rows act simultaneously,the damping value increases by nearly 732. 7 %.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第1期146-152,共7页
Journal of Vibration and Shock
关键词
颤振
全环多排
流固耦合
气动阻尼
压力波
blade flutter
full-annulus / multi-row
fluid-structure interaction
aerodynamic damping
pressure wave
