Abstract
Separated flows in a centrifugal impeller are analyzed by using a singularity method on the assumption that the absolute flow is two-dimensional, steady, imcompressible, inviscid, and irrotational. By using an iterative method, the boundary conditions on the surface of separated region is applied exactly on the surface; a non-linear theory. From the angular momentum relations, it is shown that the most reasonable flow is obtained in the case when the separated region terminates with a cusped form. The velocity field and the pressure distributions are given for various flow rated and assumed separation points. The decrease in head is larger for upstream separation. Over/under filing effects are discussed by applying the present method on the assumption that the flow is separated at the trailing corners of thick vanes.
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