Abstract：In order to investigate the flow characteristics of the outlet conduit flow characteristics of the vertical axial-flow pump device, a certain pumping station was taken as the research object, and the numerical simulation was conducted on the model pump device based on the whole flow field. Combining with the turbulent kinetic energy, streamline distribution and pressure distribution, the dynamic characteristics of unsteady flow inside the outlet conduit was researched. Then, the Q criterion was used to analyze the vortex structure in the outlet conduit. Based on the eigenvalue method and the vorticity method, the vortex core was extracted from the outlet conduit under different working conditions in an unsteady rotation cycle. The results show that under part-load conditions, more vortex structure and vortex core could be captured at the inlet of outlet conduit, and these vortex gradually disappear along the exit direction. Besides, the strength of vortex core reduces gradually as the fluid flows from the entrance of the outlet conduit; the number of vortex under the designed condition is the least for the two methods; under the designed condition, there is no vortex core at the middle part.
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