抄録
It's known that pump head of centrifugal impeller with higher blade outlet angle in air-water two-phase flow condition is kept higher, though the efficiency in water single-phase flow condition is inferior. This fact implies that high efficiency operation becomes possible in both water single-phase flow and air-water two-phase flow conditions by the use of centrifugal pump impeller with variable blade outlet angles. On the other hand, it is found that the installation of diffuser vanes is effective for the improvement of air-water two-phase flow performance of a centrifugal pump. In the present paper, pump performances of the centrifugal impeller with variable blade outlet angles in both water single-phase flow and air-water two-phase flow conditions are described. In addition, effects of installing diffuser vanes on the performances of centrifugal pump with movable bladed impeller are discussed.
