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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%。
The traditional analysis of blade flutter is mostly based on the single-rotor model. The compactness of the engine leads to the decrease of the interstage distance. The influence of multi-row coupling on flutter will not be neglected. A 1.5-stage high-pressure compressor with a self-developed program was used to simulate the fluid-structure interaction, and the influence of upstream and downstream leaf row on the flutter characteristics of rotor blade was analyzed. According to the typical working conditions, the aerodynamic stability of the blades of a single-rotor model, a guide vane rotor model, a rotor stator model and a guide vane rotor stator model are respectively analyzed. The results show that the shock wave has a significant effect on the flutter characteristics. The reflection and superposition of unsteady pressure waves in multi-row environment significantly change the unsteady pressure amplitude and phase of rotor blade surface, which in turn changes the aerodynamic stability of the rotor blade. Multi-row interference enhances the aerodynamic damping of the rotor blades, especially when the upstream and downstream leaf banks simultaneously increase their damping by nearly 732.7%.