遠心羽根車の回転円板と静止円板間の隙間流れと摩擦トルクの関係

抄録

The friction loss acting on a rotating disk for flows in a narrow clearance was investigated by the experimental and computational method. We used the experiment apparatus simulating a clearance flow between a rotating impeller and a stationary casing in centrifugal pumps. The CFD analyses were carried out to evaluate the adequacy of experimental results. The friction torque could be evaluated by the Reynolds number considering not only the disk rotational speed, but also physical property due to temperature change of working fluids. Additionally, it was noted we could minimize the friction torque by choosing optimum value of disk clearance width which differed depending on the flow direction.