Study on Pump Performance of Impeller with Radial and Circumferential Flow Channel

Centrifugal pumps requiring small flow rate and high head performance are required to improve performance at low specific speed. However, a low specific speed impeller cannot be applied to the conventional design method. Therefore, special impellers have also been proposed. In this paper proposes an impeller with circumferential and radial flow channels. Then also proposes a method to predict the performance of the impeller and evaluates its validity. As the result, it is more efficient than the conventional low specific speed pump and the unstable head curve was also improve. Furthermore, the difference between the primary performance prediction method and the experimental value is suggested to be loss of volute casing.