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针对直冲洗网式过滤器在实际应用中无法将黏附在滤网内表面泥沙冲洗干净的问题,提出结构优化方案,即在保持滤网面积不变的前提下,将滤网形状做成渐缩式。采用Fluent软件,分别对圆筒式和渐缩式网式过滤器在过滤和冲洗条件时的清水流场进行模拟。结果显示,数值模拟和现场测试的水头损失和排污压强的相对误差分别为6.04%、4.03%,采用的多孔阶跃模型和Realizableκ-ε模型,具有较高的准确性;圆筒式和渐缩式网式过滤器在过滤时流场分布相似,但渐缩式网式过滤器在直冲洗时能明显提高滤网内部及滤网内表面的流速,从而将滤网内表面冲刷得更干净,缩短了冲洗时间,降低了冲洗频率,减小了耗水量。该结果为过滤器后续的研发奠定了基础。
In view of the problem that the straight flush filter can not be used to flush the sediment on the inner surface of the strainer in practical application, a structural optimization scheme is put forward, that is to say, the shape of the strainer is made gradually while keeping the area of the strainer constant Shrink. The Fluent software was used to simulate the water flow field of the cylindrical and tapered mesh filters under the filtration and flushing conditions respectively. The results show that the relative errors of head loss and blowdown pressure are 6.04% and 4.03%, respectively. The porous step model and Realizable κ-ε model are of high accuracy in numerical simulation and on-the-spot testing. Cylinder and taper Flow-type filter in the network when the flow distribution is similar, but the tapered filter in the straight flushing can significantly improve the internal filter and filter the inner surface of the flow rate, so that the inner surface of the filter scour more clean, Shorten the flushing time, reduce the flushing frequency and reduce the water consumption. The result laid the foundation for the subsequent research and development of the filter.