浑水泥沙粒径与含沙量对迷宫流道堵塞的影响

Influence of muddy water concentration and particle diameter on clogging of labyrinth channels

为客观评价浑水中泥沙特性对滴头流道堵塞的影响以及合理选择滴灌水质处理方法,采用L9(34)的正交试验设计方法,进行了浑水间歇灌水测试,并提出了以滴头平均相对流量和灌水均匀度系数作为基本参数的滴头堵塞程度综合评价方法,比较分析了压力、含沙量以及泥沙粒径等变化对滴头堵塞比例和堵塞程度的影响规律.研究结果表明:对于粒径小于0.1 mm的泥沙颗粒,工作压力对流道堵塞的影响非常显著,其次为泥沙粒径;滴头堵塞程度的大小是由粒径、含沙量、工作压力三者相互耦合作用引起的,且相互之间不存在单调相关关系.在实际灌水过程中,当灌溉水中含有较多小于0.1 mm的泥沙颗粒时,应尽量滤除粒径小于0.048 mm的颗粒,并可加入分散剂,阻止细小黏粒的团聚絮凝作用,以提高滴头抗堵塞能力.

A better understanding of the effect of suspended solids characteristics in muddy water on labyrinth-path emitters is critical to prevent an emitter from clogging and select an appropriate water treatment approach in drip irrigation systems.In this study,the impacts of sediment particle size,sediment concentration and inlet pressure on the clogging level of the emitters used in drip irrigation systems were investigated by means of intermittent muddy water tests scheduled with the L9（34） orthogonal design table.The clogging level was evaluated with the relative average flow rate and irrigation uniformity coefficient of flow through an emitter.The result showed that the clogging level is determined by sediment particle size,sediment concentration and inlet pressure,but not monotonically related to a single factor.The clogging level is significantly influenced by the inlet pressure followed by sediment particle size when particle size〈0.1 mm.In field irrigation practice,it is recommended to filter the fine sediment particles（〈0.048 mm） and add dispersants to inhibit the flocculation of tiny viscous particles and so as to improve the performance of emitters.The findings from this study will help enhance our understanding of the clogging mechanisms of emitters and the use of high-sediment water in drip irrigation.