氧化沟流场的计算流体力学数值模型研究  

Numerical Computation of Flow Fields in An Oxidation Ditch by Computational Fluid Dynamics Model

作　　者：蒋成义[1] 黄卫东[2] 王淦[3] 王颖哲[3] 谢荣焕[3] 

机构地区：[1]安徽职业技术学院,安徽合肥230011 [2]中国科技大学地空学院,安徽合肥230037 [3]安徽国祯环保节能科技股份有限公司,安徽合肥230088

出　　处：《环境科学与技术》2010年第8期135-140,共6页Environmental Science & Technology

基　　金：安徽省高校优秀青年人才基金(2009SQRZ212);国家高技术研究发展计划(863计划)项目资助(2004AA601065)

摘　　要：该研究发展了氧化沟计算流体力学模型。采用三维标准k-ε湍流计算流体力学模型对全尺度氧化沟进行了数值模拟和试验验证,并用动量源项方法描述倒伞曝气机对氧化沟中流体的驱动作用,试验结果和模拟计算间良好的一致性证明了模型的合理性。模拟和试验均发现大量低流速区域的存在,尤其是表面曝气机下部靠近沟底的区域,有必要改善氧化沟的水力学性能。同时,对网格独立性进行了验证,比较了不同湍流模型的计算结果。On the basis of the standard three dimensional(3D)k-ε turbulence model of computational fluid dynamics(CFD),an algorithm was developed for investigating the full-scale flow regime of an oxidation ditch (OD).Momentum source terms were used to depict the action of impellers that were driving the Carrousel OD.The CFD model was validated with flow velocity data measured through the in situ experiment.A number of low velocity zones were found from the results of both the experiment and simulation,particularly near the ditch bottom underneath the impellers,which suggested the need for improving the OD’s hydrodynamics.Meanwhile,the grid-independence was validated;and different turbulence models were compared,such as Realizable k-ε and Reynolds Stress,in terms of the volume average velocity and average velocity at different cross sections.

关 键 词：氧化沟 流场 计算流体力学 动量源项 倒伞曝气机 

分 类 号：X703[环境科学与工程—环境工程]