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| 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 |
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