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| Pump selection of ultra-low head and large flow tubular pumping station |
| LI Lingyu |
| Shanghai Youwei Engineering Design Co. Ltd., Shanghai 200093, China |
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Abstract To study the selection of ultra-low head and large flow pump, a tubular pumping station with a design net head of only 0.32 m was taken as an example to predict the pump performance. By using the existing pump model, the similar conversion of pump section characteristic curve and device cha-racteristic curve were compared for this pumping station. After further mathematical deduction, a me-thod of using the characteristic parameters of model pump section to calculate the efficiency of the pump device is proposed. And the results are verified by numerical simulation and model test. The results show that the existing low head pump model in the South-to-North Water Diversion Project can be used to convert for the shaft tubular pump device with operating head below 1 m by reducing diameter and rotational speed. Due to the high proportion of pump channel head loss, the optimal working efficiency of the pump is about 6% lower than that of the pump with about 3 m operating head. The cha-racteristic parameters deviation converted from model device with larger head difference is larger, and the characteristic parameters converted from model pump section is more accurate. The conversion formulas of pump section efficiency and pump device efficiency were used to convert the operating point of pump section curve and the corresponding flow channel loss, which can accurately predict the head range of high efficiency zone in device efficiency curve. The calculation method can be a reference for the design of ultra-low head pumping station in the future.
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Received: 09 April 2021
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