基于CFD的斜板沉淀池沉淀特性分析  

Analysis of sedimentation characteristics ofinclined plate sedimentation tank based on CFD

作　　者：陈恩汉 马立山[1] 樊书铭 杨国丽[1] 冯博伟 刘昊洋 CHEN Enhan;MA Lishan;FAN Shuming;YANG Guoli;FENG Bowei;LIU Haoyang(Hebei University of Architecture,Zhangjiakou,Hebei 075000)

机构地区：[1]河北建筑工程学院,河北张家口075000

出　　处：《河北建筑工程学院学报》2024年第1期186-190,203,共6页Journal of Hebei Institute of Architecture and Civil Engineering

摘　　要：采用欧拉-拉格朗日方法研究了普通斜板沉淀池内水流的流态,利用单向耦合的离散项模型(DPM),计算了普通斜板沉淀池在不同工况条件下颗粒沉积特性及池内流动特性。针对普通斜板沉淀池沉淀效果差,颗粒容易再次上浮,设计了一种改良V型斜板沉淀池,并且结合标准k-ε模型,利用PISO算法,通过北京云超算中心计算了不同颗粒粒径下改良V型斜板沉淀池内颗粒运动的轨迹。结果表明:使用改良V型斜板后,颗粒物的沉降性路径减小,但是涡流强度增加,此时能量耗散更快,有利于固液分离;粒径大的颗粒也更容易沉淀。The Eulerian-Lagrangian method was used to study the flow pattern in the ordinary inclined plate sedimentation tank.The particle deposition characteristics and flow characteristics in the ordinary inclined plate sedimentation tank under different working conditions were calculated by using the one-way coupled discrete phase model(DPM).In view of the poor sedimentation effect of ordinary inclined plate sedimentation tank and the easy re-floating of particles,an improved V-shaped inclined plate sedimentation tank was designed.Combined with the standard k-εmodel,the PISO algorithm was used to calculate the trajectory of particles in the improved V-shaped inclined plate sedimentation tank under different particle sizes through the Beijing supercomputer platform.The results show that after using the improved V-shaped inclined plate,the settling path of the particles decreases,but the eddy current strength increases.At this time,the energy dissipation is faster,which is conducive to solid-liquid separation.Larger particles are also easier to precipitate.

关 键 词：斜板沉淀池 数值模拟 颗粒去除率 离散项模型 

分 类 号：X703[环境科学与工程—环境工程]