| 引用本文: | 陈领伟,刁新伊,陶洪飞,等.分水器和流量对微压过滤器内部流场影响的数值模拟[J].灌溉排水学报,2024,43(10):84-96. |
| CHEN Lingwei,DIAO Xinyi,TAO Hongfei,et al.分水器和流量对微压过滤器内部流场影响的数值模拟[J].灌溉排水学报,2024,43(10):84-96. |
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| 摘要: |
| 【目的】揭示微滴灌系统中不同流量和分水器对微压过滤器的流场变化规律的影响。【方法】采用Fluent软件对不同流量（5、8、11、14、17 m3/h）和有、无分水器条件下的微压过滤器开展全试验数值模拟，分析其矢量场、速度场和压强场的变化规律。【结果】标准k-ε湍流模型与VOF模型可作为模拟过滤器内部流场的数学模型。不加入分水器时，过滤器内部易形成死水区，死水区集中于滤网前端两侧，且随流量增大而增大，最大流速位于连接管进口中心处，在滤网内部形成“烛火”型速度梯度，高压区域主要位于过滤池底部0~0.1 m处，其面积随流量增大而减小。加入分水器后，水头损失增加，过滤器内部存在涡旋，死水区面积减小，最大流速和高压区域的分布规律与无分水器工况一致。加入分水器减少了流量对流速、压强分布的影响。【结论】在不同流量和分水器条件下，各平面的矢量场、速度场和压强场的分布规律大致相似，加入分水器使流场分布得到改善，滤网利用效率提高，进水和出水效率提高。 |
| 关键词: 微滴；数值模拟；流量；分水器；流场 |
| DOI：10.13522/j.cnki.ggps.2023470 |
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| Numerical analysis of effect of the distributor and flow rate on internal flow in micro-pressure filters |
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CHEN Lingwei, Diao Xinyi, TAO Hongfei, LI Qiao, MAHEMUJIANG Ahmat,
JIANG Youwei, YANG Wenxin, WEI Jianqun
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1. College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China;
2. Xinjiang Key Laboratory of Hydraulic Engineering Safety and Water Hazard Prevention and Control, Urumqi 830052, China;
3. Department of Agriculture and Rural Affairs, Chabchal Xibe Autonomous County, Yili 835300, China
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| Abstract: |
| 【Objective】Micro-pressure filters are important components in micro-drip irrigation systems and their performance depends on many factors. In this paper, we study the impact of the distributor and water flow rate on water flow field within the filters. 【Method】The study was based on numerical analysis. We used the software Fluent to simulate water flow in the filters under flow rates ranging from 5 to 17 m3/h, both with or without the water distributor.【Result】The standard k-ε turbulence model and the Volume of Fluid (VOF) model effectively simulated water flow fields within the filters. Without the water distributor, a dead water zone developed on either side of the front end of the filter screen, with its extent expanded as the flow rate increased. The maximum velocity was at the centre of the inlet connecting pipe, creating a velocity gradient shaped like an inverted cone within the filter screen. A high-pressure zone was developed at the bottom of the filter chamber, with its area decreasing with increasing flow rate. Adding a water distributor increased head loss, generated vortices, and reduced the dead water area. While the distribution of maximum water flow and pressure with and without the distributor was comparable, the distributor mitigated the influence of flow rate on velocity and pressure distributions in the filters.【Conclusion】The overall distribution patterns of velocity and pressure in the filters remained consistent across different flow rates. Adding a water distributor enhanced the flow field, improved filter screen use, and increased the efficiency of water inlet and outlet. These findings provide valuable insights for future research on optimizing water flow and improving the structural design of micro-pressure filters. |
| Key words: microdrip irrigation; numerical simulation; inlet flow; water distributor; flow field |
