周进周出辐流式沉淀池三维数值模拟与PIV实验对比研究  

Comparative experimental investigations between PIV and three dimensional numerical simulation of circular clarifier

作　　者：王涛[1,2] 施周[1,2] 施清华[1,2] 涂朦朦 周石庆[1,2] 

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]湖南大学建筑安全与节能教育部重点实验室,长沙410082

出　　处：《环境工程学报》2017年第1期159-164,共6页Chinese Journal of Environmental Engineering

基　　金：国家科技支撑计划资助项目(2012BAJ24B03)

摘　　要：沉淀池是污水处理工艺流程中的重要环节,池内水流流态对沉淀池的处理效果有着较大的影响。利用计算流体力学(CFD)中常用的FLUENT软件,采用重整化RNG k-ε2方程模型对周进周出辐流式沉淀池内的湍流情况进行了数值模拟,同时利用粒子成像测速(PIV)技术对沉淀池中的流速进行了实测,研究结果表明,沉淀池顶部和底部区域流速较大,而中部区域流速相对较小,形成了一个较大的回流区。计算模拟值与实测数据吻合良好,证明了CFD数学模型能准确地模拟沉淀池内的流速分布及流场沿程变化情况,此模型可以应用于沉淀池内部流场模拟。Clarifiers are an important part of the sewage treatment process,and the flow state has great influence on the removal efficiency of the clarifier. In this study,the improved RNG k-ε two-equation model was used to simulate the fluid velocity distribution based on FLUENT software,and particle image velocimetry（ PIV） technology was employed to test the velocities in a circular clarifier. The results demonstrated that the velocities in the top and bottom regions of the clarifier were large. However,the velocities in the central region were small,and a big recirculating area formed in this region. Moreover,the simulation results agreed well with the measured data from velocity field tests by PIV,and this comparison confirmed that the method employed in this study is reliable and able to simulate a clarifier＇s velocity.

关 键 词：周进周出沉淀池 流场 粒子成像测速(PIV) 数值模拟 

分 类 号：X703[环境科学与工程—环境工程]