Dynamics Analysis of Compressor Blade Under Aerodynamic Excitation
Based on the theory of reversing engineering,the point cloud data of aero-engine compressor blade were captured to es-tablish the three-dimensional geometry model and finite element calculation model,which the modeling precision was validated by a vibration modal test.According to the theory of computational fluid dynamics,the blade flow-field model was built.Consider-ing the coupling loads between airflow excitation and structural deformation,the internal flow field of compressor and the dy-namic characteristic of blade were carried out under the typical working speeds.It is found that the aerodynamic excitation has ob-vious influence on modal frequency and stress distribution of the blade.In the critical resonant speeds,the blade will excite low-order harmonic resonance,and the vibration stress distribution is mainly affected by the mode shapes.Moreover,the low-order modes of the blade are more easily excited according to the transient response analysis so that it is necessary to carry out the fre-quency adjustment in the design stage to avoid the fracture failure of the blade by resonance.
万方数据
维普
