| 引用本文: | 钟 艺,刘凯硕,李 娜,等.网式过滤器的滤网优化探究[J].灌溉排水学报,2025,44(8):86-92. |
| ZHONG Yi,LIU Kaishuo,LI Na,et al.网式过滤器的滤网优化探究[J].灌溉排水学报,2025,44(8):86-92. |
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| 摘要: |
| 【目的】Y型网式过滤器作为微灌系统中常用的过滤设备，其性能影响着这个微灌系统的运行，为了提高滤网的过滤效率以及抗堵塞能力。【方法】以CFD DEM（Computational fluid dynamics，CFD；Discrete element method，DEM）耦合模拟过滤精度为190 μm（80目）的网式过滤器在滤网网孔6种堵塞数量（0、5、10、15、20、10+10）下，其内部压降系数、流场、压力与滤网网面流量分布等水力特性的变化，并通过试验对模拟结果的可靠性进行验证。【结果】随着网孔堵塞数量的增加，水头损失也在增大，当堵塞20个网孔时，与无堵塞情况水头损失相差30%；堵塞滤网网孔后流场规律变化并不明显，腔内整体压力随网孔堵塞数量的增多而增大，当堵塞5个最大流量网孔时，高流速区域面积减小4%，内部速度场分布更加均匀，压力出口处负压面积减小37%；堵塞5个最大流量网孔时，网面总过流量最大；堵塞5、10个网孔时，最大流量位置坐标都是向外偏移，最小流量位置坐标基本不变；当堵塞15、20个网孔时，最大流量位置集中在高流量区域中心位置；与无堵塞情况相比，堵塞5、10、10+10个网孔时，高流量区域面积增大19.2%、18.3%、22.9%，使得滤网过滤效率提高。【结论】堵塞5个最大流量网孔为最佳方案，可以有效减少回流现象以及改善压力分布情况。 |
| 关键词: Y型网式过滤器；滤网优化；数值模拟；水头损失；内部流场 |
| DOI：10.13522/j.cnki.ggps.2024357 |
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| A proposed method for optimization of the screen filter in micro-irrigation systems |
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ZHONG Yi, LIU Kaishuo, LI Na, WANG Changman, HUANG Guoan, YU Liming
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1. Yunnan Jiaotou Ecological Environment Engineering Co., Kunming 650000, China;
2. Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650000, China
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| Abstract: |
| 【Objective】The Y-type mesh screen filter is a key component in micro-irrigation systems, with its filtration performance directly affecting system operation and longevity. This study proposes and evaluates a method to enhance the filtration efficiency and clogging resistance of mesh filters.【Method】A coupled CFD-DEM two-phase flow model was developed and validated against experimental data. The validated model was used to analyze hydraulic performance parameters - including pressure drop coefficient, flow field characteristics, and pressure and velocity distributions - on mesh filters with a filtration precision of 190?μm (80 mesh). Simulated scenarios involved progressive mesh blockage, ranging from 0 to more than 20 blocked mesh holes.【Result】Pressure head loss increased with the number of blocked mesh holes; for example, blocking 20 holes resulted in a 30% increase in head loss compared to the unblocked condition. While the overall flow field remained relatively stable, the pressure field intensified with increased blockage. Blocking five mesh holes led to a 4% reduction in the high-velocity region area, resulting in a more uniform velocity distribution. Additionally, mesh blockage reduced the negative pressure zone near the outlet by up to 37%. The total overflow across the mesh surface peaked when five holes were blocked. At 5 and 10 blocked holes, the position of maximum flow shifted outward, whereas the minimum flow position remained fixed. At 15 or 20 blocked holes, the highest flow rate concentrated in the center of the high-velocity zone. When 5, 10, and 10+10 holes were blocked, the area of the high-flow region increased by 19.2%, 18.3%, and 22.9%, respectively, suggesting improved filtration efficiency under moderate blockage conditions.【Conclusion】Blocking five mesh holes is the best solution, as it can effectively reduce backflow and improve pressure distribution. |
| Key words: Y-type screen filter; screen optimisation; numerical simulation; head loss; internal flow field |
