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刘春山, 牧振伟, 贾亚非.基于CCHE模型的重力沉沙池水沙数值模拟水资源与水工程学报[J].,2019,30(1):150-155
基于CCHE模型的重力沉沙池水沙数值模拟
Numerical simulation of water and sediment in gravity settling basin based on CCHE model
  
DOI:10.11705/j.issn.1672-643X.2019.01.23
中文关键词:  CCHE模型  沉沙池  悬移质  数值模拟  水沙分离效率
英文关键词:CCHE (center for computation hydroscience and engineering model)  settling basin  suspended load  numerical simulation  water-sediment separation efficiency
基金项目:新疆维吾尔自治区高校科研计划创新团队项目(XJEDU2017T004); 新疆维吾尔自治区高校科研计划技术推广项目(XJEDU2017A002); 新疆维吾尔自治区国际科技合作计划项目(20136021)
作者单位
刘春山1, 牧振伟1, 贾亚非2 (1.新疆农业大学 水利与土木工程学院 新疆 乌鲁木齐 8300522.美国密西西比大学 国家水科学及工程计算中心美国) 
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中文摘要:
      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 m3/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/m3),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。
英文摘要:
      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 m3/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/m3). 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.
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