Experimental and numerical study on the free surface vortex of a mixed flow pump device model

Because of the advantages of small installation space, good cavitation performance, low cost and easy maintenance, the open channel pump station is widely used in agricultural production, flood control and ecological construction. In the process of operation, large-scale vortices such as wall vortex, bottom vortex and surface vortex easily appear. Under special working conditions, the head and efficiency of the pump station will be reduced, cavitation will occur at the blades, shafting will move, and the unit will vibrate, which will reduce the service life and safety of the pump station. In this paper, the head, efficiency, flow characteristic and free surface vortex of a mixed flow pump device model in pumping station under different water level and flowrates are studied numerically and experimentally, providing experience and theoretical reference for the design of the pumping station.