关键词: 离心泵, 升力做功, 水力性能, 压力分布

Abstract:

To study the influence of the work done by lifting force in centrifugal pumps on its hydraulic performance, the experimental research and numerical simulation are carried out. It is found that the pressure gap between the pressure side and the suction side exists on the blade of the centrifugal pump with impellers of the same radius, which generates a lifting force, and the work done by lifting force decreases with the increase of the flow. The co-work done by lifting force and centrifugal force determine the external characteristic curve of the pump, in the process the lifting force work could account for up to 90% of the centrifugal force work, and 46% of the total lift of the pump. In different operating conditions, the work done by centrifugal force generally stays stable while the work done by lifting force varies considerably, which determines the variation tendency of the external characteristic curve. The results of theoretical calculation and experimental research are compared and found to tally with each other, which in turn proves the correctness of the numerical simulation.

Key words: centrifugal pump, lift force doing work, hydraulic performance, pressure distribution