Effects of a new-design diffuser and a tail piece on an axial-flow pump’s performance

Australasian Fluid Mechanics Society
Publication Type:
Conference Proceeding
Proceedings of the 20th Australasian Fluid Mechanics Conference, 2016
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Measurements have been conducted to gauge the effects of a new-design diffuser and an additional tail-piece on the performance of an industry-sized axial-flow pump unit. The new-design diffuser was seen in a previous study to reduce the swirling motion that would eventually dissipate as lost energy and was still present in the flow as it exits from the standard pump-unit that was originally fitted with a conventional conical diffuser. The additional tail-piece, which is conical with an apex angle of 20° is fitted to the new diffuser’s exit to allow for a gradual change in the flow area from the diffuser’s exit to the discharge pipe, instead of a sudden expansion. Impellers with 5 vanes and 8 vanes have been used. With the 8-vane impeller, an improvement in performance has been obtained, compared with the standard pump, when both the new diffuser and the additional tail-piece are used together. With the 5-vane impeller, however, the standard pump performs better. CFD (Computational Fluid Dynamics) analysis using ANSYS CFX has also been conducted; and this also shows the benefits of the additional tail-piece when the 8-vane impeller is used.
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