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J. Kumar, A. Laß, F.-H. Wurm
A mixer propeller is used in sewage application to keep particles in water suspended and therefor provides kinetic energy to fluid for plug flow. This system has several mechanical components like blades, hub, shaft, gearbox, bearings and induction motor. Its power-train is a complex, nonlinear multi-energy domain system. Specialized tools and commercial software have been developed in last few decades to model different physical domains individually. To overcome modelling problem, bond graph (BG) methodology is used to model the entire power-train where every element is attached to its neighbor using power bonds considering physical causality. Formerly two-way fluid-structure interaction (FSI) is performed for the propeller blade using Ansys-CFX and Ansys-APDL solver code. k-? SST turbulence model is used for computational fluid dynamic simulation (CFD) to calculate torque and thrust on the blades. Damping coefficient and averaged flow-induced forces are calculated based on transient result of two-way FSI. Further averaged flow-induced forces including damping coefficient are communicated to the blade nodes in BG model. By this uni-directional FSI (weak coupling) is setup for rotor dynamic analysis of mixer power-train using BG. Hydrodynamic mass of water on structural system is not yet considered. The BG methodology combined with CFD can be used to develop a reliable, robust and agile technique for multi-energy domains systems including FSI. Transient analysis and frequency spectrum is plotted for blade and whole rotating system. Effect of eccentricity and CFD loading is analyzed thoroughly. The strong coupling of CFD and BG including fluid-induced forces due to the dynamics of involved system components like motor, gearbox and hub is kept as future work for research.
Deutscher Luft- und Raumfahrtkongress 2015, Rostock
Verlag, Ort:
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2015
Conference Paper
21,0 x 29,7 cm, 9 Seiten
Stichworte zum Inhalt:
bi-directional FSI, multiphysics
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