| 引用本文: | 陶洪飞,冯瑞鑫,李 琦,等.微灌用浮筒网式旋转过滤器的清水流场特性研究[J].灌溉排水学报,2026,45(7):91-100. |
| Tao Hongfei,Feng Ruixin,Li Qi,et al.微灌用浮筒网式旋转过滤器的清水流场特性研究[J].灌溉排水学报,2026,45(7):91-100. |
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| 摘要: |
| 【目的】探究不同流量和滤网目数对微灌系统中浮筒网式旋转过滤器清水流场变化规律的影响。【方法】采用Fluent软件对不同流量（260、295、330、365、400 m3/h）和滤网目数（80、100、120目）条件下的浮筒网式旋转过滤器开展全试验数值模拟，分析其速度场和压强场的变化规律。【结果】清水条件下，模拟浮筒网式旋转过滤器流场的最佳模型为多孔介质-VOF-标准k-ε耦合模型，物理试验与数值模拟结果相对误差≤8%，证明了数值模拟的可靠性。流量增大导致高流速区（＞0.1 m/s）扩大、低流速区（＜0.1 m/s）缩小，但流速分布规律基本不变；滤网目数增加则使内部流速整体下降，且受旋转影响中部流速分布不均。过滤器外部水体绝大部分为正压，高压区（＞190 000 Pa）集中在外部水体底部，且随流量增大高压区扩大；内部及出水管水体多为负压，随流量增大，底部滤网负压区增大。同时，滤网目数增大导致外部水体压强及滤网附近负压增大，而出水管内部压强分布呈不同变化趋势。【结论】浮筒网式旋转过滤器的流速分布和压强变化受流量和滤网目数共同影响，在不同流量和滤网目数条件下，各平面的速度场和压强场的分布规律大致相似。 |
| 关键词: 数值模拟；流场特性；过滤器；微灌 |
| DOI：10.13522/j.cnki.ggps.2025297 |
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| Effects of flow rate and screen mesh size on clean water flow field in pontoon mesh rotary filter for micro-irrigation |
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Tao Hongfei, Feng Ruixin, Li Qi, Chen Lingwei, Li Qiao, Jiang Youwei
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1. College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China;
2. Xinjiang Key Laboratory of Water Conservancy Engineering Safety and Water Disaster Control, Urumqi 830052, China
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| Abstract: |
| 【Objective】Clogging is a common problem faced by micro-irrigation filters. Optimizing structural and operating parameters is essential for improving their performance. This study investigated the effects of different flow rates and screen mesh sizes on the flow field of clean water in a pontoon mesh rotary filter used in micro-irrigation systems.【Method】The study was based on numerical simulations using the Fluent software. We compared the combined effects of five flow rates: 260, 295, 330, 365 and 400 m3/h, and three screen mesh sizes: 80, 100 and 120 mesh. For each combination, we analyzed the variations in flow velocity and pressure fields inside the filter.【Result】For clean water flow, the porous media-VOF-standard k-ε coupled model was optimal for simulating water flow in the pontoon mesh rotary filter; its relative errors compared with physical experimental results were less than 8%. Increasing flow rate expanded the high-velocity zones (＞0.1 m/s) and shrank the low-velocity zones (＜0.1 m/s), without significant effect on the overall velocity distribution. Increasing screen mesh sizes reduced internal flow velocity; rotational movement resulted in uneven velocity distribution in the central area within the filter. The exterior of the filter was dominated by positive pressure, with high-pressure regions (＞190 000 Pa) concentrated at the bottom. The area of these regions increased with flow rate. Negative pressure prevailed inside the filter and the outlet pipe; the negative pressure areas near the bottom increased with flow rate. Increasing mesh sizes elevated the external water pressure and aggravated negative pressure around the screen; pressure inside the outlet pipe exhibited irregular variation patterns under different flow rates and mesh sizes.【Conclusion】Flow rate and screen mesh size jointly regulate the velocity and pressure distribution within the pontoon mesh rotary filter. Changes in the two parameters did not exert a noticeable influence on the overall spatial distribution of velocity and pressure in different filter cross-sections. |
| Key words: numerical simulation; flow field characteristics; filter; Micro-irrigation |
