Carrousel氧化沟固-液两相水力特性数值模拟  

Numerical simulation of the solid-liquid two-phase flow on the hydraulic characteristics in Carrousel oxidation ditch

作　　者：刘妍妮 蔡亚希 杨晓栋 

机构地区：[1]陕西省交通职业技术学院,西安710018 [2]陕西省土地工程建设集团,西安710075 [3]西安市自来水有限公司,西安710082

出　　处：《应用力学学报》2018年第5期1152-1157,共6页Chinese Journal of Applied Mechanics

摘　　要：为研究氧化沟内的固-液两相流,本文采用数值计算的方法,以典型的四沟道Carrousel氧化沟为研究对象,通过将污泥沉降速率模型与两相湍流混合物模型耦合,建立了氧化沟固-液两相湍流混合物模型,从而实现了垂向上固-液两相的分离。模拟结果显示:氧化沟内的污泥浓度变化趋势总体呈现出与水流流速变化趋势相反的分布规律,即越接近沟底,污泥浓度越大,流速越小;越接近水面,污泥浓度越小,流速越大。此外,在大弯道处,形成弯道环流,造成了外弯道的冲刷和内弯道的淤积,大弯道内壁处的污泥浓度整体高于弯道外壁处。本研究结果对实际工程中防止或减少沟内污泥沉积,提高氧化沟污水处理效率有一定的指导意义。In this paper, the numerical simulation method is used to study the solid-liquid two-phase flow in four-channel Carrousel oxidation ditch, solid-liquid two-phase separation in the vertical is implemented through the sludge sedimentation rate model coupled with two-phase turbulence model, and a solid-liquid mixture two-phase turbulence model is established. The results show that: in general sludge concentration presents a trend contrary to the flow velocity distribution variation trend in the oxidation ditch, near the bottom of the ditch there are some high sludge concentration and low velocity regions but near the surface of the water, the sludge concentration is low and the velocity is high. In addition, at the large bend, the bend circulation is formed. That will lead to sludge siltation close to the interior wall and scour close to the exterior wall, the sludge concentration close to the interior wall is higher than that close to the exterior wall. The results are of reference value for reducing the sludge deposit in an oxidation ditch and for improving the efficiency of wastewater treatment.

关 键 词：氧化沟 固-液两相流 湍流模型 数值模拟 

分 类 号：TV131.4[水利工程—水力学及河流动力学]