Large-scale Fluid-structure Coupling Vibration Analysis Of Mixed Flow Fan

As a kind of typical impeller mechanical, mixed flow fan is characterized by a high wind pressure coefficient of centrifugal fan and a high air volume coefficient of axial flow fan, which is widely used in industrial and living systems. However, various factors would cause lots of faults that affect the stable operation of the fan, such as the surging, wake excitation, noise and stalling. Part of these failures is caused by fluid-structure interaction phenomenon, namely the interaction between fluid and structure with fan flow field. On the other hand, with the constant improvement of the fan design requirements, the static and dynamic characteristics and operation of impeller is also becoming increasingly complex, so that many factors should be considered in the study.Therefore, the paper is focused on the mixed flow fan, using the modern numerical simulation method. First of all, based on computational fluid dynamics (CFD), we accurately captured the fan information of the complex flow field, including the three-dimensional unsteady turbulent flow state, pressure fluctuation analysis, etc. Secondly, based on the finite element method in computational structural dynamics (CSD), we get the dynamic response of the blade working in the air medium, after making the aerodynamic elasticity analysis for fan impeller structure, including dynamic force analysis, spectrum analysis, etc. Finally, taking the fluid-structure coupling effect into consideration, a comprehensive analysis of the fan flow field and structure features is completed, which can provide important reference information for the future design and optimization of the series of mixed flow fan.