Abstract
A numerical method for analysing the steady incompressible potential flow through an impeller and its upstream and downstream ducts in a turbomachine is presented. The 3-D flow region containing the impeller and the 2-D axisymmetric flow regions both upstream and downstream are calculated iteratively. Since the 3-D flow calculation has been described in the previous papers, a computational method of the axisymmetric flow and patching conditions are presented here. In this computation, the equation of Strokes' stream function is solved by the variational FEM using bilinear quadrilateral elements, and a vorticity component corresponding to the trailing vortices is considered in the downstream region. The flows in an impeller having different shaped upstream and downstream ducts of a single suction centrifugal pump are calculated, and the effects of these ducts are shown.
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