重型燃气轮机压气机第一级动叶片颤振分析

Flutter analysis for the first stage rotor blade in a heavy duty gas turbine compressor

动叶片颤振是影响燃气轮机压气机安全运行的重要因素之一。针对某重型燃气轮机压气机第一级动叶片的颤振,分别采用单向和双向流固耦合方法对不同工况下的动叶片状态进行分析。结果表明:在设计工况下气流阻碍动叶片振动,动叶片结构保持稳定;在近失速工况下动叶片发生颤振,颤振频率为112.00Hz;单向和双向耦合方法均可应用于动叶片颤振分析;双向耦合方法计算的最大应力值大于单向耦合方法,更符合实际状态。

Rotor blade flutter is one of the main influencing factors affecting the safe operation of gas turbine compressor. By using the one-way coupling and two-way coupling method, flutter analysis for the first stage rotor blade in a heavy duty gas turbine compressor is accomplished under different conditions. The results show that, under the design condition, the flow hinders the rotor blade vibration, and the first stage rotor blade of the compressor remains stable. The blade flutter occurs under the near stall condition and the flutter frequency is 112.00 Hz. The one-way coupling and two-way coupling methods can both be applied to analyze the rotor blade flutter. The maximum stress value calculated by the two-way coupling method is higher than that by the one-way coupling method, which is more suitable for the actual situation.