论文部分内容阅读
采用RNG k-ε两方程紊流模型以及简化的多相流Mixture(混合)模型对进口处不同长度的两种垂直挡板的辐流式二次沉淀池内的液固两相流进行了三维数值模拟,得到了沉淀池内的流场分布、污泥浓度分布、速度分布。速度与压力耦合方程组求解时使用半隐式SIMPLE(SemiImplicit Method for Pressure-Linked Equations)算法。通过对这两种不同挡板池内的水流流场、浓度场、速度场的模拟分析,结果发现:长挡板形式下的辐流式沉淀池内水流流场更有利于污泥快速沉淀,即有利于固液分离,使得出口水质明显提升;同时也说明合理改变沉淀池的结构体形与尺寸,可以改善沉淀池内的流场流态,提高沉淀效果和运行效率。
Two-phase turbulence model of RNG k-ε equation and simplified multi-phase flow Mixture model were used to perform three-dimensional numerical simulation of liquid-solid two-phase flow in radial flow two-stage sedimentation tanks with different lengths of two vertical baffles at the inlet. In the simulation, the flow field distribution, sludge concentration distribution, and velocity distribution in the sedimentation tank were obtained. The velocity and pressure coupled equations are solved using the semi-implicit SIMPLE (Semi-Implicit Method for Pressure- Linked Equations) algorithm. Through simulation analysis of flow field, concentration field and velocity field in the flow of water in the two different baffle pools, we found that the flow field in the radial flow sedimentation tank in the form of a long baffle is more conducive to rapid sludge precipitation. The solid-liquid separation facilitates the improvement of the water quality of the outlet; at the same time, it also shows that changing the structural shape and size of the sedimentation tank reasonably can improve the flow field flow in the sedimentation tank and improve the sedimentation effect and operating efficiency.