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| DOI：10.13522/j.cnki.ggps.2020406 |
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| Experiment and Numerical Studies on Eccentric Venturi Flow Meter |
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CAI Shouhua, SHENG Yuanqian, SHEN Yalong
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College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
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| Abstract: |
| 【Background】Low-pressure pipe irrigation has become increasingly popular in China, while there is a lack of flow meters suitable for measuring water flow in low-pressure pipes.【Objective】Given that traditional Venturi flow meter used for flow measurement in low-pressure pipe irrigation system is prone to silting on its upstream side, this paper presents a new eccentric Venturi flow meter to ameliorate this defect and improve measurement accuracy.【Method】A FLOW-3D numerical model was established to simulate water flow in the eccentric Venturi tube, with the straight pipe diameter DN100 and diameter reduction ratio 0.35. The model was compared with experimental measurements.【Result】The discharge coefficient calculated from the numerical model was consistent with the discharge coefficient obtained from experimental measurements, proving that the model is able to simulate water flow in the eccentric Venturi pipe. The relative error of the eccentric Venturi flow meter is less than 5%, meeting the requirements for measuring water flow in irrigation pipes.【Conclusion】The eccentric Venturi flow meter has a potential application in measuring water flow in low-pressure pipe irrigation systems. It is accurate even when water flowing in the pipes is muddy having high sediment concentration. |
| Key words: Pipe-flow measurement; eccentric Venturi tube; numerical simulation; discharge coefficient; flow meter |
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