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The behavior of the boundary layer in rotating channels, such as that in impeller passages of turbomachinery, is dominantly influenced by the centrifugal and Coriolis forces due to the wall curvature and system rotation, respectively. The resultant force may promote or suppress the instability in the boundary layer, depending on its magnitude of the component normal to the wall boundary. The purpose of the present study is to make clear experimentally the effects of Gortler type instability on the laminar boundary layer developing along the concave surface, focusing attention on transition process from laminar to turbulent state in the rotating system with streamline curvature. The longitudinal velocity and turbulent intensity have been measured near the concave surface in the channel whose radii of center line curvature is 2 000 mm. Different types of secondary instability such as varicose and sinuous modes were found to follow the generation of Gortler vortices, depending on the magnitude of the resultant force of centrifugal and Coriolis forces, acting toward the concave wall.

Study of Boundary Layer Flow in Rotating Curvature System (Effects of Wall Curvature and System Rotation on Goertler Type Instability)