抄録
This papaer reports on an innovative method of changing a centrifugal low specific speed pump performance by applying exit blade flaps to impeller outlet. Centrifugal pump is designed to a specification associated with the maximum impeller diameter. Therefore, when higher head is demanded, a large impeller diameter will be required. Another method to modify pump performance is the formation of flaps at impeller blade exits. The exit blade edge section corresponds to the trailing edge of wing on the circular-cascade, which dominates the pump performance and pressure fluctuation. This paper presents an analytical method of predicting the pump performance related to the attachment of a flap at the trailing edge of impeller outlet. The influence of the flaps on the pressure fluctuation is explained by introducing Kurtosis of flow velocity distribution.
