The Analysis Of Fluid-structure Interaction Of The Large Centrifugal Fan And The Vibration Characteristics Of The Impeller

Turbo-machinery is widely used in industrial production sector, and it plays anindispensable role in aviation, aerospace, petroleum, chemical, energy, electricity anddefense fields. The failures of the turbo-machinery, such as the surge, stall, blade fracture,has a direct relationship with the various fluid-structure interaction phenomena of theturbo-machinery. Currently, only consider a single physical field of numerical simulationhas been difficult to meet the requirements of the structural performance and reliability forturbo-machinery. Therefore, it is necessary to study the problem of fluid-structureinteraction (FSI) of turbo-machinery. The study of flow field in turbo-machinery anddynamic characteristics of the impeller has the certain significance in the design andoperation of the equipment.First, based on the CAD software PRO/E, the model of large centrifugal fans isdeveloped. The model of large centrifugal fans is composed of three parts: the currentcollector, the impeller, the volute. The mesh of the model of centrifugal fan is developed bythe professional software Gambit, and then the boundary conditions are fixed on.Secondly, standard turbulence model is adopted, with FLUENT software as the tool inthe ANSYS Workbench; the3D turbulent flow field problem in the impeller of thecentrifugal fan is solved.The influences of the blade profile on speed distribution, pressdistributions and the flow regulation pattern in the impeller of a centrifugal fan also studied.Again, Loading fluid pressure of impeller wall which be analyzed by fluid calculationon impeller model surface through establishing the connection between different analysis ofANSYS Workbench projects, then analysis the strength of the impeller, and comparing theresults of the impeller under the combined effect of centrifugal force, centrifugal force andgravity, fluid-solid coupling analysis, to obtain stress and deformation of the impeller underdifferent loads, check the impeller strength and stiffness in order to avoid fracture.Last, obtain natural frequency and vibration mode of centrifugal impeller which is inthe Free states and under pre-stress through model analysis under the physical constraints ofstate. Analysis the structural stiffness and dynamic characteristics of impeller and found thatthe weak links, to avoid the occurrence of resonance.