不同工作压力下穿孔形灌水器内的旋涡作用分析

Analysis of vortex action in perforated emitters under different working pressures

为探究穿孔形流道内的旋涡对灌水器的抗堵塞与消能性能的影响,基于试验验证的数值模拟方法,对4种工作压力下流道中的流场分布、旋涡区的几何特征、涡旋强度及压力分布进行了分析,同时研究了该灌水器内不同粒径泥沙颗粒的运动情况.结果表明:旋涡区可对流道边壁进行持续冲刷清洗并减缓颗粒在流道内部的聚积,旋涡区可发挥抗堵塞作用;旋涡区内不同流速的流层间、旋涡区与主流区间、旋涡区与流道边壁间的摩擦作用都会消耗能量,旋涡区可发挥消能作用;旋涡区在不同压力下形态稳定.以上分析表明,旋涡区在不同压力下稳定存在,并可提高滴灌灌水器的抗堵塞与消能性能,为灌水器的抗堵塞及水力性能优化提供参考.

In order to explore the influence of vortex in perforated channel on anti-clogging and energy dissipation performance of emitters,based on the numerical simulation method verified by experiments,the flow field distribution,geometric characteristics of vortex zone,vortex intensity and pressure distribution in four kinds of working pressure channels were analyzed,and the movement of sediment particles with different particle sizes in the emitter was also analyzed.The results show that the vortex zone can continuously wash and clean the side wall of the channel and slow down the accumulation of particles in the perforated channel,and the vortex zone can play an anti-clogging role.The friction between different flow velocity layers,vortex zone and main flow zone,and vortex zone and channel side wall in the vortex zone will consume energy,and the vortex zone can play an energy dissipation role.The vortex can exist stably under different working pressures.The above analysis shows that the vortex zone exists stably under different working pressures,and can improve the anti-clogging and energy dissipation performance of drip irrigation emitters,which can provide reference for anti-clogging and hydraulic performance optimization of emitters.