REDUCTION METHOD FOR FINITE-ELEMENT DYNAMIC ANALYSIS OF SUBMERGED TURBOMACHINERY WHEELS

The proposed method allows the efficient computation of natural freque ncy mode shape and harmonic response of submerged rotationally periodi c structures, such as turbine or centrifugal pump wheels. The geometry of such structures is complex and the influence of the surrounding fl uid has to be taken into account. The fluid is assumed to be incompres sible and at rest. Both fluid and structure domains are modelled using the finite element method. The size of the problem is appreciably red uced using the properties of wave propagation in periodic systems comb ined with modal techniques. The efficiency of the method is shown by a n application to a submerged centrifugal pump wheel where the numerica l results are compared to experimental results. Copyright (C) 1996 Els evier Science Ltd