基于Fluent流场模拟的絮凝剂加药管结构改进研究  

Research on structure improvement of flocculant dosing tube based on Fluent flow field simulation

作　　者：张新喜[1,2] 邱高 钟梅英[1] 马江雅[1] 王凯 冯承民 秦晴 ZHANG Xinxi;QIU Gao;ZHONG Meiying;MA Jiangya;WANG Kai;FENG Chengmin;QIN Qing(College of Architectural Engineering,Anhui University of Technology,Ma'anshan 243032,China;Engineering Research Center of Water Purification and Utilization Technology Basedon Biofilm Process,Ministry of Education,Ma'anshan 243032,China)

机构地区：[1]安徽工业大学建筑工程学院,马鞍山243032 [2]生物膜法水质净化及利用技术教育部工程研究中心,马鞍山243032

出　　处：《给水排水》2022年第9期7-12,共6页Water & Wastewater Engineering

基　　金：国家自然科学基金(51878001);安徽省标准化专项(202004h07020030)。

摘　　要：针对传统絮凝剂加药管插入水管中心处受源水管非稳定的较大水流冲击压力而易疲劳从根部折断,絮凝剂沿源水管壁流动混合效果较差的问题,采用Mixture两相流模型,利用Fluent软件,对源水与絮凝剂的混合进行模拟,分析加药管不同插入角度时的最大静压与速度矢量,不同插入深度时絮凝剂扩散云图;利用数学理论积分对改进前后进行证明,并对应用中的传统加药管结构进行改进。研究结果表明,加药管在沿水流方向与源水管壁所成插入角越小,其流体速度矢量越趋于平缓;加药管45°为最佳插入角度,此时最大静压为垂直插入时的47.28%,分析2根对称加药管插入深度的扩散云图,插入为深度源水管直径1/4处,轴心处扩散长度与管壁处扩散长度差值|L_(1)—L_(2)|的绝对值最小(210 mm),药剂混合效果最好。理论积分证明,加药管插入角度45°、插入深度到源水管径1/4处时,加药管弯矩仅为90°插入至中心处的16.25%;对加药管结构进行改进,加药管以及固定支座配套使用,实际应用检修与更换较方便。Aiming at the problem that the traditional medium flocculant dosing tube is inserted into the center and is easily broken from the root by the unsteady largewater flow impact pressure of the source water pipe, and the flocculant flowing along the wall of the source water pipe has poor mixing effect.Using the Mixture two-phase flow model and using Fluent software, the mixing of source water and flocculant was simulated, and the maximum static pressure and velocity vector at different insertion angles of the dosing pipe were analyzed, and the flocculant diffusion cloud diagram at different insertion depths;The mathematical theory integration is used to prove before and after the improvement, and the traditional dosing tube structure in application is improved.The results show that the injection angle between the charging pipe and the wall of the source water pipe decreases gradually along the flow direction, and the fluid velocity vector gradually flattens. When the different injection angle of the charging pipe is 45°, the maximum static pressure is 47.28% of the vertical injection angle, and 45° is the best injection angle;Analysis of the diffusion cloud map of the insertion depth of two symmetrical dosing pipes, the insertion is at 1/4 of the diameter of the depth source water pipe, and the absolute value of the difference between the diffusion length at the axis and the diffusion length at the pipe wall |L_(1)—L_(2)| is the smallest(210 mm), the drug mixing effect is the best. Theoretical integration proves that when the insertion angle of the dosing pipe is 45° and the insertion depth is 1/4 of the diameter of the source water pipe, the bending moment of the dosing pipe is only 16.25% of that when the dosing pipe is inserted at 90° to the center;The structure of the dosing tube is improved, and the dosing tube and the fixed support are used together, which is more convenient for maintenance and replacement in practical applications.

关 键 词：数值模拟 加药管 疲劳折断 结构改进 

分 类 号：TU991[建筑科学—市政工程]