辐流式沉淀池挡板尺寸对温差异重流水力特性影响的三维模拟  

3D simulation for the influence of a feed baffle on the density current behaviors caused by temperature in a radial sedimentation tank

作　　者：魏文礼[1] 白朝伟[1] 刘玉玲[1] 

机构地区：[1]西安理工大学西北旱区生态水利工程国家重点实验室培育基地,陕西西安710048

出　　处：《西安理工大学学报》2016年第1期12-17,共6页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51578452;51178391);陕西省科学研究计划资助项目(2014K15-03-05);中央财政支持地方高校发展专项资金特色重点学科资助项目(106-00X101)

摘　　要：在冬季或夏季,沉淀池内进水与池内水的温差将导致异重流现象,从而影响池内流态及流速。本文选取Realizable k-ε湍流模型,通过设置池内水与进水的不同温度,对进口处两种不同挡板形式的辐流式沉淀池冬季与夏季工况下异重流的演变规律进行三维数值模拟。结果表明:夏季低温水进入池内产生下异重流,而冬季高温水进入池内产生上异重流;夏季高流速水流在沉淀池底部,产生逆时针旋流,冬季高流速水流在沉淀池上部,产生较大的顺时针旋流。长挡板形式下的辐流式沉淀池对冬季产生的上异重流的影响更为明显,使得池内速度场更加均匀。In summer or winter,temperature differences between the inflow water and the water in a pool will cause density flow phenomenon,whereby affecting flow pattern and flow speed in a Radial Sedimentation Tank. The Realizable k-ε model is used to carry out 3D numerical simulation of density current evolution regulation under the operational conditions by setting different temperatures between the inflow water and the water in the tank with two different forms of feed baffles near the inlet in summer or winter.The results show that： low-temperature inflow water can produce gravity flow in bottom region in summer while high-temperature inflow water produces the gravity flow in top region in winter; the higher velocity water is in bottom region of sedimentation pond,and counterclockwise vortex is obviously formed in summer,while higher velocity water is in top region of sedimentation pond,clockwise vortex is obviously formed in winter. The impact of the longer baffle on the density currents in winter is more obvious,and make velocity field more uniform in the tank.

关 键 词：辐流式沉淀池 温度 异重流 数值模拟 

分 类 号：TV131.4[水利工程—水力学及河流动力学]