微小迷宫流道中的沙粒沉积规律

为了分析迷宫型微小流道中沙粒沉积规律，通过计算流体动力学软件FLUENT对灌水器内部流场进行了分析，研究了灌水器中沙粒运动轨迹及沉积规律。研究表明：碰撞反弹系数对沙粒沉积规律影响很大，灌水器各流道单元速度场分布相似，压力场差异较大，沙粒运动轨迹基本不受各单元压力场变化的影响；粒径是影响沙粒沉积的最主要因素，粒径越大，沙粒的沉积危险系数越大；灌水器入口压力越大，沙粒的沉积危险系数越小。对沙粒沉积规律的研究，有利于深入地了解灌水器的堵塞机理，为灌水器抗堵塞设计提供一定的依据。

Deposition law of sand in labyrinth-channel of emitter

Aiming at studying the deposition law of sand in labyrinth channel, the authors analyzed the particle trajectory and deposition law of sands by Fluent software. The results showed that the restitution coefficients affected critical deposition coefficients greatly, and the velocity fields were similar while the pressures changed greatly in different units. The sand trajectories were the same in each unit with the same initial conditions, such as location, diameter, velocity and so on. It was also showed that the particle diameter was the most important factor affecting the deposition of sand and the pressure was another important factor. Deposition ratio was raised with the increase of particle diameter. And the higher the inlet pressure was, the lower the deposition ratio was. The research on the deposition law of sand in labyrinth-channel emitter is beneficial to understanding of clogging mechanism of emitters, and provides basis for anti-clogging structure design of emitters.