Abstract
This paper presents a numerical analysis method for a separated unsteady flow in a centrifugal impeller. Considering the influence of the boundary layer, the flow. which is assumed to be two-dimensional, inviscid and incompressible, is analyzed using both the boundary element method and the discrete vortex method. Based on Karman's momentum and Poisson's equation, the changes in the displacement thickness are solved and the separation point on the boundary layer is determined automatically by the shape factor H of the turbulent flow. The velocity field and the pressure distributions are solved for the discharge coefficient Ce=Q/Qn (in this paper, Ce=0.6).
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