挡板长度对辐流式沉淀池水力特性影响的数值模拟  

Numerical Simulation for Influence of Baffle Length on Hydraulic Characteristics in Radial Sedimentation Tanks

作　　者：魏文礼[1] 张泽伟[1] 洪云飞[1] 刘玉玲[1] 

机构地区：[1]西安理工大学陕西省西北旱区生态水利工程重点实验室,西安710048

出　　处：《系统仿真学报》2016年第4期826-832,共7页Journal of System Simulation

基　　金：国家自然科学基金(51178391);陕西省科学研究计划(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(106-00X101)

摘　　要：采用VOF(volume of fluid)方法追踪自由液面,辅以RNG(重正化群)k??湍流模型封闭两相流时均方程,模拟并分析了进水口处垂直挡板不同长度对辐流式沉淀池水力特性的影响。控制方程的离散采用有限体积法,速度与压力耦合求解使用了压力隐式算子分裂PISO(Pressure-Implicit with Splitting of Operators)算法。研究结果表明:长挡板模型的回流区比短挡板小,流速场分布更合理,有利于提高沉淀效率。研究结果可为实际工程中沉淀池的优化设计提供参考。The VOF（volume of fluid） method was applied to track the free water surface, and the RNG k -ε turbulent model was used to close the two-phase flow time-averaged equations. The influence of inlet vertical baffle with different lengths on hydraulic characteristics in radial sedimentation tank was simulated and analyzed. The control equations were discretized using the finite volume method. Velocity and pressure were solved using the PISO（Pressure-Implicit with Splitting of Operators） algorithm. The research results show that： the long length feed flow baffle model has a smaller recirculation zone, better velocity field distribution than short length baffle, and the long length feed flow baffle model is conducive to improve sedimentation efficiency. The results can provide a reference for optimization design of an actual engineering of sedimentation tanks.

关 键 词：沉淀池 数值模拟 水力特性 流场 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]