Numerical Evaluation of Unsteady Flow in a Centrifugal Pump by Omega Vortex Identification Method

The internal unsteady flow is related to the Gansu Province, vortices generated in the channels of the centrifugal pump. In the present paper, the Omega vortex identification method was applied to study the vortex structure and unsteady flow characteristics of the centrifugal pump, and the threshold was 0.51. The results showed that the LES model was more detailed than the other two turbulence models, and it can capture the small vortex structure in the blade flow channel. At design conditions, the vortex area identified by LES was 1.15 times that of the DDES model and 1.55 times that of the SST k - ω model. Leaf frequency mainly excites pressure pulsation. The vortex area was closely related to the unsteady pulsation intensity of the flow field. At the exit of the impeller, the vortex structure falls off periodically and breaks when it hits the tongue. The generation of the rotor/stator interaction of the centrifugal pump was related to the shedding of the vortex structure at the exit of the impeller. © 2021, Science Press. All right reserved.