Numerical simulation and test of performance of deep-well centrifugal pumps with different stages
SHI Weidong 1,2*, HOU Yunhe 1, ZHOU Ling 1, LI Yuemin 3, XUE Shaohui 3
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China; 3. Shanxi Skysea Pump Limited, Yuncheng, Shanxi 044000, China
A deep-well centrifugal pump of type 250QJ80 was chosen to be study model and features of the pump performance at different numbers of stages were explored numerically and experimentally, further the root causes for these features were clarified in terms of analysis of internal flow field in the pump. In the paper, software ANSYS-CFX 17.0 was used to carry out numerical predictions on the pump performance based on three pump models with single stage, two stages and three stages, respectively. The computational domain of three models has experienced geometrical modelling and structured-mesh creation, then the water flow field in these models were simulated under a few working conditions based on the standard k-ε turbulence model and standard wall function. The predicted performance of these models was obtained, compared and analyzed against the corresponding experimental data. The results show that the change in pump stages doesn′t affect the performance of the pump with a specific number of stages. However, the head and efficiency of the first stage are higher than those of the se-cond or third stages, while the head and efficiency of the second stage doesn′t differ obviously from the third stage. The main reason for this similarity and difference in the head and efficiency is that the impeller of the first stage is without any pre-swirl, while the impellers of the rest stages are subject to a certain amount of pre-swirl.
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