Abstract:In order to study the internal flow field in two high specific speed centrifugal pumps with different volutes, a pump with logarithmic spiral splitter is designed based on a pump with single logarithmic spiral volute. The cross-sectional area and the main parameters of two pumps are identical. A series of numerical simulations are conducted by making use of the SST k-ω turbulence model and ANSYS 14.5 software to obtain the unsteady, three-dimensional and turbulent flows in the centrifugal pumps with single and double volutes under different operational conditions. The performance of the pump with single volute are tested to validate the accuracy of simulations. It is found that the pump with double volute is subject to a better hydraulic efficiency and higher head at high flow rates. However, the effect of the splitter on the performance is minor under design and part-load conditions. In addition, the pressure fluctuations in the double volute pump are less than those in the single volute pump, especially at the outlet, suggesting the splitter can damp pressure fluctuations effectively. It can be seen that the flow in the double volute is smoother than that in the single volute based on the streamline patterns in the diffuser. Compared with the single volute pump, the double volute centrifugal pump can undergo a reduced radial thrust, especially at high flow rates. The results are valuable for the hydraulic design of high specific speed centrifugal pumps in some degree.
张霞, 袁寿其, 张金凤, 黄茜. 螺旋形蜗壳型式对高比转数离心泵性能的影响[J]. 排灌机械工程学报, 2017, 35(1): 25-31.
ZHANG Xia, YUAN Shouqi, ZHANG Jinfeng, HUANG Xi. Effects of spiral volute type on performance of high specific speed centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(1): 25-31.
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