迷宫流道偏差量对灌水器水力性能及抗堵塞性能的影响

Influence of the Offset of Labyrinth Channels of Drip Emitters on Hydraulic and Anti-clogging Performance

以齿尖偏差量分别为-0.25、0、0.25和0.50 mm的齿形流道结构形式的灌水器为研究对象,应用CFD单相流流场速度数值分析、CFD两相流沙粒浓度分布数值分析、试验样品清水和浑水测试相结合的方法,研究了偏差量对灌水器水力性能和抗堵塞能力的影响。结果表明:偏差量与流态指数呈正相关关系,与流量系数呈负相关关系,而随着偏差量的增加灌水器的抗堵塞能力也在下降,综合分析偏差量对水力性能和抗堵塞性能的影响,认为在满足流态指数的要求下应尽量减小偏差量以提高抗堵塞能力。

The influence of offsets （ - 0.25 mm, 0, 0.25 mm, 0.50 mm） of dental labyrinth channels of drip emitters on hydraulic and anti-clogging performance was studied by the following methods： there were numerical simulations carried out for the liquid-phase flow and the liquid-solid two-phase flows in the flow field by the CFD program Fluent, and the samples were tested. The obtained results showed positive relationship between offset and discharge coefficient, and negative relationship between offset and flow state exponent. With the increasing of the offset of emitters, the anti-clogging ability declined. Thus, combining the hydraulic and anti-clogging performance, under the condition of adequate flow state exponent, it put forward a suggestion that reducing the offset as much as possible to enhance the anti-clogging performance.