13th European Conference on Turbomachinery Fluid dynamics & Thermodynamics

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Kirill Kabalyk - Lodz University of Technology


The paper describes an effort to numerically define the temporal dependences of mechanical stresses in a centrufugal compressor impeller caused by unsteady aerodynamic loads at nominal and precursor diffuser stall conditions. The object is a moderate Mach number shrouded wheel followed by a vaneless diffuser. The method applied is one-directional fluid-structure interaction with fully-transient fluid-flow- and  structural simulations. The results indicate a clear distinction between stable and unstable flow-induced forces acting on the blades. On the other hand, the mechanical response predictions show rather marginal sensitivity to the operating point studied. 


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