A Study On the Boundary Layer of a Centrifugal Impeller Blade

概要

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Rotation of a centrifugal impeller and blade curvature have much effect on the boundary layer flow along the blade surface. Since these effects do not appear in the flow of zero-order boundary layer approximation, in this analysis the perturbation method is used to obtain flows of higher orders in case of the laminar boundary layer. In the first place, a general theorem is presented for the effect of rotation on the laminar boundary layer on the surface of a two-dimensional body with arbitrary shape. In the second step, the laminar boundary layer on a rotating circular arc blade is analyzed as one of the simplest models of a centrifugal impeller blade. To consider the more general cases, effects of the main stream velocity and the blade geometry are taken into account. Further later in the present paper, results of the numerical calculation are shown for a thin logarithmic spiral blade in case that the main stream velocity changes linearly.
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