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为了研究不同计算方法对颤振计算的影响,采用标准低压涡轮叶栅颤振模型——STCF4(standard test configuration 4)算例4中的628跨音速工况,分别用四种颤振计算方法(能量法、影响系数法、驻波模态法和单叶片模态法)进行全面计算和分析,为工程实践选取合适的颤振计算方法提供参考。阐述了涡轮叶栅中后行波比前行波更不稳定的原因,展现了叶片间相位角的形成过程,从而揭示了叶片间相位角对结构气动弹性稳定性具有关键性作用的原因。
In order to study the influence of different calculation methods on the flutter calculation, a standard low-pressure turbine cascade flutter model - STCF4 (standard test configuration 4) in Example 4 628 transonic operating conditions, respectively, with four flutter calculation method ( Energy method, influence coefficient method, standing wave modal method and single blade modal method) to provide a reference for choosing appropriate flutter calculation method in engineering practice. The reasons why the backward traveling wave is more unstable in the turbine cascade than that of the forward traveling wave are demonstrated. The formation process of the phase angle between the blades is revealed. The reason why the phase angle between the blades plays a key role in the aerodynamic stability of the structure is revealed.