Absolute Flow Near Impeller Inlet of Centrifugal Turbomachine

抄録

In this paper, flows in axisymmetric channels between a curved casing and a boss without blades, where the impeller inlet of the mixed-flow and radial-flow turbomachines existed usually, were studied experimentally and theoretically. Measured velocity and pressure distributions were compared with those calculated by the relaxation method of Laplace's equation and some approximate methods. Furthermore, boundary layers on the casing and boss walls were discussed in detail. Velocity distributions of a ;main flow in the channel were very different from uniform ones. As the local pressure drop on the curved casing wall was observed, its effect on the cavitation performance was pointed out. The main flow in the curved channel was not affected by the boundary layers on the casting and boss walls near the entrance.