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| DOI：10.13522/j.cnki.ggps.2019343 |
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| Comparing Hydraulic Models for Analysis of Large Vertical Axial Flow Pumps |
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HU Qiujin, TANG Fangping, SHI Lijian, SHANG Xiaojun, WANG Chaofei, ZHOU Ying
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1. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225100, China；2. Jiangsu Taihu District Water Conservancy Project Management Office, Suzhou 215000, China
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| Abstract: |
| 【Objective】Selecting vertical axial flow pump is an important step in studying water pump technology transformation, and a robust selection is critical for efficient, stable and safe operation of the pumping station. This paper aims to present a numerical method to help select the pump.【Method】The method was based on the time-averaged NS equation and the RNG k-ε turbulence model to simulate water flow in the vertical axial flow pump. We compared the traditional selection method and the method of increasing flow with equal head. The pump device performs numerical calculation of the full flow channel, and the external characteristics of the pump device and the guide vane flow line distribution under different operating conditions are added as a reference index for analyzing the pump selection method. The reliability of the hydraulic models was verified again the model tests.【Result】The model selected by the traditional selection method had a high head in the high-efficiency zone of the pump, but considering the loss of the culvert at the back, it can be applied to the pumping station. The selection method of equal head and flow rate is reasonable in the high efficiency area, but the maximum head cannot meet the requirement. The maximum error between numerical calculation and the results of the model test is less than 5%, and the overall performance curve is relatively good. The numerical calculation is reasonable and reliable for simulating the pump device.【Conclusion】The selection method of increasing the flow rate by equal heads can ensure that the highest efficiency point of the axial flow pump is close to the design. Practical engineering design needs to consider each characteristic head. |
| Key words: Pump selection; vertical axial pump device; numerical simulation; model test |
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