Effect of the blade outlet angle on unsteady characteristics of a single channel pump

Abstract

To study the effect of on energy performance and unsteady characteristics of the single-channel pump, the experimental tests about the energy characteristics, head pulsation, pressure fluctuation and radial force have been conducted by the synchronous test. 3 different impellers with the blade outlet angle of 8°, 16° and 25° respectively are studied. The results show that with the increase of from 8° to 25°, the head increases gradually and the maximum increase amplitude reaches 22.6 %. As changes from 8° to 25°, there is a maximum efficiency. The mixing loss at the impeller outlet can be decreased by reducing. With the increasing of , the minimum head in time domain gradually lag and the maximum head gradually advances. The pressure fluctuation in each measuring point shows the trend of increasing first and then decreasing with the increasing of the flow rate. With increasing, the radial force also increases and the maximum increase amplitude of minimum radial force is larger than 8 %. The research can provide some reference for the optimization of single channel pumps.

Study on the Unsteady Characteristics and Radial Force of a Single-Channel Centrifugal Pump

“…Under low-flow conditions, the pressure pulsation amplitude on the impeller outlet torus is small, while under design and high-flow conditions, the pressure pulsation amplitude on the impeller outlet torus is enhanced. Tan et al and Nishi et al , studied the influence of the impeller outlet placement angle on the energy performance and unsteady characteristics of the single-channel centrifugal pump. The results show that with the increase of the impeller outlet placement angle, the minimum head gradually lags behind and the maximum head gradually advances in the time domain.…”