滴灌灌水器迷宫流道主航道抗堵设计方法研究

为从结构设计上解决灌水器的堵塞问题,针对滴灌灌水器的各种微小迷宫流道形式,应用计算流体力学(CFD)数值模拟可视化地揭示了迷宫流道内部流动场的情况,并通过流体力学相似实验,用激光多普勒测速仪(LDV)测量了流道中的速度流场,验证了流态模拟计算的正确性.在此基础上,分析了迷宫流道的堵塞机理,针对流道中存在的流动滞止区结构,提出迷宫流道主航道抗堵优化设计方法,使优化后流道中不存在流动滞止区,提高迷宫型灌水器的抗堵性能,并通过了实验验证.

Anti-clogging design method for the labyrinth channels of drip irrigation emitters

In order to resolve the clogging problem of emitter from structure design and aiming at various kinds of small labyrinth channels of the drip irrigation emitters, the Computational Fluid Dynamics (CFD) was used to conduct the numerical simulation and visually reveal the flow behaviors in the labyrinth channels of emitters. The velocity field was measured by Laser Doppler Velocimeter(LDV) in hydrodynamic similarity experiment to verify the computational results. On this basis, the anti-clogging mechanism was analyzed. A "main-route anti-clogging design" method was proposed to optimize the structure in the stagnant areas in order to enhance anti-clogging performance of emitter channels. And it was verified through anti-clogging experiment.