基于CCHE模型的重力沉沙池水沙数值模拟
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摘要
为了研究重力沉沙池流量、含沙量与水沙分离效率的关系,借助CCHE软件,建立CCHE2D水沙两相流数学模型,采用混合掺长紊流模型,对重力沉沙池进行数值模拟,得到沉沙池内水流流态、悬移质输移规律以及沉沙池的水沙分离效率,并在前人研究的基础上,进一步对不同流量、含沙量情况下,其流量和含沙量对沉沙池水沙分离效率的影响进行分析。结果表明:当流量在0. 05～0. 30 m~3/s时,随着流量增大,则流速增大,水流挟沙力增大,不利于泥沙沉降,使沉沙池的水沙分离效率降低;改变初始含沙量(5～20 kg/m~3),随着初始含沙量的增大,由于沉淀池尾部回流区存在,使得部分泥沙直接被带入清水池,使得沉沙池水沙分离效率降低。
In order to study the relationship between the flow and sediment concentration of the gravity settling basin and the water-sediment separation efficiency,this paper sets up a CCHE2D mathematical model for water sediment two phase flows with the aid of CCHE software and uses the mixed length turbulence model to numerically simulate the gravity settling basin so as to get the flow state of the settling basin,the transport law of suspended load and the water-sediment separation efficiency of the settling basin.In addition,based on the previous studies,this paper further analyzed the influence of flow and sediment concentration on water-sediment separation efficiency of the settling basin when flow and sediment concentration are different. The results showed that when the water flow is from 0. 05 to 0. 3 m~3/s,as the flow increases,the flow rate quickens,and the sediment carrying capacity increases,which is not conducive to sediment deposition and will reduce the water-sediment separation efficiency of the settling basin and change the initial sediment content( 5 to 20 kg/m~3). As the initial sediment content increases,some sediments will be directly brought into the clean water basin because of the existence of tail reflux area of the sediment basin,which will reduce water-sediment separation efficiency of the settling basin.
In order to study the relationship between the flow and sediment concentration of the gravity settling basin and the water-sediment separation efficiency,this paper sets up a CCHE2D mathematical model for water sediment two phase flows with the aid of CCHE software and uses the mixed length turbulence model to numerically simulate the gravity settling basin so as to get the flow state of the settling basin,the transport law of suspended load and the water-sediment separation efficiency of the settling basin.In addition,based on the previous studies,this paper further analyzed the influence of flow and sediment concentration on water-sediment separation efficiency of the settling basin when flow and sediment concentration are different. The results showed that when the water flow is from 0. 05 to 0. 3 m~3/s,as the flow increases,the flow rate quickens,and the sediment carrying capacity increases,which is not conducive to sediment deposition and will reduce the water-sediment separation efficiency of the settling basin and change the initial sediment content( 5 to 20 kg/m~3). As the initial sediment content increases,some sediments will be directly brought into the clean water basin because of the existence of tail reflux area of the sediment basin,which will reduce water-sediment separation efficiency of the settling basin.
引文
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[15]徐乐,牧振伟,李园园,等.基于CCHE模型的乌斯满引水枢纽水流数值模拟[J].水资源与水工程学报,2015,26(5):172-176.
[16]徐乐,牧振伟,李园园,等.基于CCHE的塔什米里克引水枢纽二维水流数值模拟[J].水利与建筑工程学报,2016,14(2):83-89.
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[19]李卫鹏,何照青,陶洪飞.导片锥角和片数对悬锥装置水沙分离效率的影响研究[J].水资源与水工程学报,2013,24(2):77-79.
[2]中华人民共和国水利部.水利水电工程沉沙池设计规范:SL269-2001[S].中国水利水电出版社,2001:22-34.
[3]徐长学.沉淀池中异重流现象的理论分析[J].人民长江,2013,44(5):66-68.
[4]戚印鑫,耿凡坤,刘亚丽,等.重力沉沙过滤池模型试验研究[J].泥沙研究,2016,41(6):19-24.
[5]刘亚丽,赵涛,戚印鑫,等.河水滴灌重力沉沙过滤池物理试验研究[J].人民黄河,2018,40(5):148-152.
[6]易玉林.旋流式沉沙池的数值模拟计算[J].环保科技,2016,22(1):24-26+31.
[7]JAYANTI S,NARAYANAN S.Computational study of particle-eddy interaction in sedimentation tanks[J].Journal of Environmental Engineering,2004,130(1):37-49.
[8]杨红,潘光在.沉沙池立面流场数值模拟研究[J].泥沙研究,2000,25(2):55-59.
[9]田艳,张根广,秦子鹏.厢式沉沙池进口优化试验及流场三维数值模拟[J].中国农村水利水电,2013(8):89-94.
[10]陶洪飞,马英杰,洪明,等.初始浑水含沙量对沉淀池中流速分布的影响[J].水电能源科学,2017,35(4):120-123+62.
[11]陶洪飞,杨海华,马英杰,等.流量对河水滴灌重力沉沙过滤池内流速分布的影响[J].农业工程学报,2017,33(1):131-137.
[12]陶洪飞,杨海华,戚印鑫,等.河水滴灌重力沉沙过滤池的清水流场模拟[J].水电能源科学,2016,34(10):114-117+99.
[13]陶洪飞,戚印鑫,杨海华,等.河水滴灌重力沉沙过滤池中浑水流场分布规律[J].排灌机械工程学报,2017,35(9):785-791.
[14]李园园,牧振伟,孙阳平,等.基于CCHE模型的石门子渠首弯道水沙数值模拟[J].水资源与水工程学报,2014,25(6):207-209+214.
[15]徐乐,牧振伟,李园园,等.基于CCHE模型的乌斯满引水枢纽水流数值模拟[J].水资源与水工程学报,2015,26(5):172-176.
[16]徐乐,牧振伟,李园园,等.基于CCHE的塔什米里克引水枢纽二维水流数值模拟[J].水利与建筑工程学报,2016,14(2):83-89.
[17]徐乐.基于CCHE模型的多沙河流引水枢纽水沙数值模拟[D].乌鲁木齐:新疆农业大学,2016.
[18]吕科,赵涛.基于不同数学模型对某弯道式渠首水沙运动的数值模拟对比研究[J].水资源与水工程学报,2018,29(2):150-155.
[19]李卫鹏,何照青,陶洪飞.导片锥角和片数对悬锥装置水沙分离效率的影响研究[J].水资源与水工程学报,2013,24(2):77-79.