滴灌用自清洗网式过滤器排污压差计算方法

对滴灌用自清洗网式过滤器排污压差进行了计算,分别得出了80目和120目过滤器总压差值,并与实测值进行了对比,结果表明两者基本一致;详细分析了流量、含沙情况和过滤时间等约束条件对排污压差的影响规律,结合试验获得了清水和浑水水头损失变化曲线,在保证水头损失不发生急剧上升前提下,给出了两种目数过滤器最佳排污压差值.

Calculating and Experiment on Drainage Pressure Difference of Self-cleaning Screen Filter for Drip Irrigation

The drainage pressure difference of self-cleaning screen filter was calculated, and the total value of pressure difference for 80 mesh and 120 mesh was also calculated respectively at first. Contrasting with measured value, the result indicated that the calculated value and measured value were substantial identical. Then, the law of pressure difference was analyzed particularly, which influenced by restriction condition as flow, sand and time, etc. Finally, the variation curve of clean and muddy head loss acquired by the experiments, under the condition that the head loss could not ascend sharply, the best drainage pressure difference for two kinds of mesh was put forward, which could provide reference for the pressure difference calculation of screen filter.