Abstract
A finite element simulation is presented for steady, three-dimensional, incompressible, potential flow in a centrifugal turbomachine. The numerical algorithm was based on the Galerkin's principle on the isoparametric hexahedral elements with periodic conditions on the inlet and outlet surfaces of the blade passage. Detailed velocity and pressure fields in a radial pump are examined, and its hydraulic performance is discussed. Results show that flow has strong vortical structures. The flow speed on the meridional surface is smaller near the pressure side than near the suction side. Strong pressure variation occurs at the turning region where flow changes from the axial to radial direction. The hydraulic efficiency of the pump increases with the increasing volume flow rate below the design point, above which it decreases with increasing volume flow rate.
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