轴流压气机叶排干扰所引起转子叶片的振动应力

 轴流压气机中上游导叶排与下游转子叶排相互干扰,这一非定常流动诱发了叶片振动.由此,利用有限元法,对所造成的振动应力进行了数值分析.建立了轴流压气机工程设计中求解作用于叶片非定常气动力的近似方法.讨论了叶型几何和静叶数对叶片振动应力的影响.给出由此所造成的叶片动应力分布图,与实验结果基本接近,得到了有益的结论.

Dynamic Stress on Rotor Blades from Row Interactions in an Axial Flow Compressor

We investigated the impact of interaction of downstream rotor blade row with upstream guided vane row, i.e., interactions of wake and potential flow field, in a single stage axial flow compressor, on vibrations of rotor blades due to the unsteady flow induced by the interaction. With the help of FEM, numerical simulations have been carried out with some correlated factors, such as the geometry of vane profile, the number of guided vanes and so on, in affecting dynamic stress distributions in the rotor blades. An approximate method was given out to compute unsteady flow forces, acting on the rotor blades for compressor designers. Finally, dynamic stress distribution diagrams were illustrated for an example case. The comparison between the computed results and the measurement qualitatively came closer. Some useful conclusions have been obtained.