Monday  |  Salon 13  |  02:10 PM–02:30 PM

#15793, Modal Verification and Thermal-Fluid-Structure Coupled Analysis of Centrifugal Impeller

The topic of this article is to investigate mechanical behaviors and dynamic characteristics under working conditions. The verification of finite element model (FEM) performed by experimental modal analysis (EMA) is discussed. The finite volume model (FVM) is established to analyze the aerodynamic and thermal effects under working conditions by computational fluid dynamics (CFD). With the consideration of loading conditions coupled with the results of CFD, the deformation, stress distribution, and modal parameters of the impellers are estimated by finite element analysis (FEA). To verify the reliability of FEM of the fluid-thermal-structure coupled analysis, modal verification is employed to ensure the consistency between the FEM and the actual structure. The modal assurance criterion (MAC) is applied as an indicator to quantify the consistency of mode shapes. In coupled stress analysis. The results show that the centrifugal load is the main factor of stress concentration, and the corresponding location of maximum stress is on the center of the impeller. In coupled modal analysis, the centrifugal force is also sensitive to the change of dynamic characteristics, however, only obviously influences the natural frequency of structures.

Po-wen Wang   National Pingtung University of Science and Technology
Chang-Sheng Lin   National Pingtung University of Science and Technology