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| Based on the low-specific speed centrifugal pump model of IS 50-32-160, two impellers are designed with and without splitter blades. The influence of adding splitter blades on the performance of the pump is studied by using numerical method. At first, the measurements of controlling simulation errors are presented, including the building of numerical and physical model, the determination of grid number, difference style and the Iterative residuals. The flow morphology shows that, when adding splitter blades to the impeller, the impeller periphery velocities and pressures become more homogeneous, which can reduce the pressure fluctuation at the area between impeller outlet and volute inlet; the lift head are evaluated at various flow rates, and the flow capacity in the volute is increased, which result in larger operating range; the flow in the part of volute diffuser become more uniform, and the use of it increase. By the performance forecasting, their performance curves are get, and the influence of splitters is presented: the curve of H-Q become more flat, the operating range is extended; the curve of η-Q become widen, and the maximum efficiency move to the larger flow rate, but not at the BEP; And the slope of the P-Q curve increase rapidly, which may result in electrical overload. |
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| Keywords:splitter blades, low- specific speed centrifugal pump，error control, simulation of full flow field |
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