The Numerical Simulation Of Liquid-Solid Two Phase Flow In Labyrinth Emitter

China is an arid country thirsty of water. Water resources crisis has influenced the continuous development of our country seriously. It not only leads to the ecological environment worsening, but also influences the food security and national economy development. Therefore, it is urgent and necessary to carry out water-saving irrigation. Drip irrigation has the advantages of Provincial-Water, Energy-Saving, Production-Increasing, Irrigation Uniformity and the adaptability to the soil and terrain compared with other water-saving irrigation techniques, such as the tube fills, the spray irrigation and so on. But the drip Irrigation also has many drawbacks, such as easy to clog, restricting root development etc. The most important of which is easy to plug-drip irrigation.The clogging of drip irrigation emitter is a bottleneck problem that drips irrigation system faced with currently. We comprehensively use various physical-chemical methods to deal with the clogging. But the drip irrigation emitter still has the clogging in some degree. The clogging of drip irrigation is related with the water flow characteristics in the drip irrigation emitter and the movement characteristics of sand particles in the water flow in the drip irrigation emitter. Therefore, we utilized software FLUENT on the numerical simulation of the clogging features inside the labyrinth emitter, meanwhile, two-phase flow theories were applied to study the state of flow and particle motion within it.The results are as follows :1) There exist low velocity regions in the body of labyrinth channel. It is easy to deposit and leads to the clogging of drip irrigation emitter When sediment particle in the labyrinth emitter flow down the low velocity regions.2) The sediment particle diameter is the primary factor and plays a definitive role in the clogging of the drip irrigation emitter.3) How the speed of water flow influence the clogging of drip irrigation emitter needs to study further.4) Particle collision with the wall coefficient has some effect on the clogging of the drip irrigation emitter. If the manufacture material's recovery coefficient of emitter is too small ,then the drip irrigation emitter is easy to be clogged 5) The muddy water concentration within a certain scope influence the clogging drip irrigation emitter is very little.