| This article has been：Browse 287Times Download 36Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2025297 |
|
| Effects of flow rate and screen mesh size on clean water flow field in pontoon mesh rotary filter for micro-irrigation |
|
Tao Hongfei, Feng Ruixin, Li Qi, Chen Lingwei, Li Qiao, Jiang Youwei
|
|
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
|
| 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 |
|
|
