手摇清洗网式过滤器内部流场的数值模拟与性能试验验证

Numerical Simulation and Experimental Study of Water Flow in Manually-operated Cleaning Screen Filter

【目的】探讨手摇清洗网式过滤器内部流场特性。【方法】以120目手摇清洗网式过滤器为研究对象,借助Solidworks流体分析模块Flow Simulation模拟过滤器内部流动特征,通过不同流量下的能量性能试验验证了数值模拟的可靠性,分析了手摇清洗网式过滤器内部水流的速度场、压强场和湍动能场,探讨了手摇清洗网式过滤器内部结构对水流特性的影响。【结果】流量越大,过滤器内部流速、湍动能等越大,水头损失越大。滤网靠近出水口区域的上半部分是主要的过滤区域,该区域受吸嘴的阻力影响,水流速度快、湍流剧烈、受力大。【结论】流量影响过滤器内部水流流速和压强的大小及其变化梯度,但不影响水流方向及流速和压强的变化趋势。过滤时,将靠近出水口一侧的最后一个吸嘴摇至滤网最下部,使得该侧的吸嘴整体位置靠下,可减少吸嘴对水流水力特性的影响。

【Objective】Manually operated screen filter is a water cleaning device used in irrigation.The purpose of this paper is to propose and validate a numerical model to simulate water flow in the device.【Method】The 120 mesh hand-operated cleaning screen filter produced by AZUD was used in this study;water flow in the filter was simulated using the Flow Simulation of Solid works.The accuracy of the simulation was verified against measured head loss from the experiment.We also analyzed the velocity field,pressure field and turbulent kinetic energy of water flow in the device.【Result】Water flow velocity,turbulent kinetic energy and water head loss all increase with the flow rate.Sediments are filtered mainly in the upper part proximal to the outlet area of the screen,where water flows fast,turbulent flow is severe,stress is strong,and the influence of the nozzle resistance is great.【Conclusion】The flow rate affects water flow velocity and water pressure in a certain area of the filter,but not the flow direction.The nozzles on the side near the outlet should be rolled to the bottom of the filter to reduce their influence on hydraulic characteristics of water flow.