Prediction of axial compressor blade vibration by modelling fluid-structure interaction

[摘要] ENGLISH ABSTRACT: The Council for Scientific and Industrial Research has developed a vibration excitationsystem. The system is designed to excite the rotor blades of an axialcompressor in the specified vibration mode and at the specified frequency. Thevibration excitation system was tested on Stellenbosch University's Rofanco compressortest bench. A two-way staggered fluid-structure interaction (FSI) modelwas created that was capable of simulating the vibration of the rotor blades excitedby the system. The results of the FSI model were verified using availableexperimental data. It was concluded that the FSI model is able to recreate thevibration excited by the system to within the desired level of accuracy. In addition,the results of the FSI model showed that the vibration excitation systemshould be able to excite the blades in the selected vibration mode and at theselected frequency provided that the excitation frequency is close the naturalfrequency of the first bending mode. The results also suggested that a transientcomputational fluid dynamics model should be sufficient for the prediction of theaerodynamic forces acting on the rotor blades. Furthermore, a one-way staggeredFSI model should be adequate for calculating the motions of the blades.

[发布机构] Stellenbosch University