航空发动机涡轮叶片振动模态影响因素研究

分别考虑离心力场、气动力场、温度场及热力场等因素的影响,使用有限元分析软件ANSYS,对某型航空发动机涡轮叶片工作状态下的振动模态进行分析,并将不同情况下的计算结果与室温静止状态进行比较,发现温度场及离心力场是影响叶片固有振动频率的主要因素,但对叶片的振型影响很小。然后,综合考虑温度场及离心力场的作用,对叶片进行了包含预应力的热固耦合模态分析,得到了叶片工作状态下的固有振动频率及振型。所得结论对航空发动机叶片的设计、改型及使用具有重要的理论意义和工程应用价值。

A Study of Influencing Factors on Frequencies and Mode Shapes of Aeroengine Turbine Blades

The mode of a certain type aeroengine turbine blades under the condition of operating regime is analyzed by using the finite elements analysis (FEA) software ANSYS in consideration of influence factors from centrifugal field, aerodynamic field, temperature and thermal field separately. It is found that centrifugal field and temperature field are the main factors influencing the natural frequency by comparing the frequencies and mode shapes with those of stationary ones at room temperature. But they have less influence on the blades'' mode shapes. And then, thermal-structure coupling modal analysis of the blades is conducted in consideration of the effects of centrifugal field and temperature field simultaneously. At the same time, natural frequencies and mode shapes of the blades are obtained in working condition. The conclusion obtained in this paper is of great significance and engineering practical value to the design, retrofit and use of aeroengine blades.