Nine groups of secondary internal flows of the decompression tower bottom pump on high temperature were simulated by Fluent, which consisted of the secondary impellers with different outlet widths and the volutes with different throat opening areas, and their performance characteristics were predicted by using finite volume method to disperse Reynolds-Averaged Navier-Stokes(RANS) equations, stan dard k-ε turbulence model and SIMPLEC algorithm. According to the predicted results, the perfor mance curves were plotted and the influence caused by the outlet widths of the impellers and the throat opening areas of the volutes were analyzed. The analyzing results indicate that with the throat opening area increasing, the inlet width of volute increases, the back flow easily emerges at small flow rate, the head reduces, and high efficiency area moves to large flow, increasing the impeller outlet width can enlarge high effective area range. It provides reference for the optimal design of the pump, and the combination C-b is considered to be the best option.
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