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Title: Three-Dimensional Centrifugal Impeller Finite Element Anaysis
Author: P. R. Gelse
Source: American Gas Association 1992
Year Published: 1992
Abstract: Finite element analysis is used extensively to analyze impellers. Previously simple one-dimensional analyses were performed. Later twodimensional axisymmetric finite element analyses became the standard. Impeller analyses performed using an option in NASTRAN called cyclic symmetry allowed the user to model a pie slice (Figure No. I ) of the impeller instead of the entire 360 degrees. This modeling procedure allowed not only steady state static analysis but dynamics analysis as well. The big advantage of this technique over previous techniques is that we could perform true threedimensional analysis instead of only one-dimensional or two-dimensional analyses. Full 360 degree models with ANSYS are now used when required and possible, and super elements with ANSYS allow similar three-dimensional dynamic analyses to be performed whenever necessary. The example which follows is a 5M Y impeller, with a 50 inch diameter. There was a concern about long term dynamic stresses, and so a full three-dimensional model was used to analyze the design.

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