倒伞形表面曝气搅拌槽内气液两相流的模拟研究  

Simulation of Gas-liquid Mixing Flow in a Stirred Tank with Inverted Umbrella-type Surface Aerator

作　　者：魏文礼[1] 娄威立 李盼盼[1] 刘玉玲[1] Wei Wenli;Lou Weili;Li Panpan;Liu Yuling(Institute of Water Conservancy and Hydraulic Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学水利水电学院,西安710048

出　　处：《系统仿真学报》2019年第4期696-701,共6页Journal of System Simulation

基　　金：国家自然科学基金(51578452; 51178391);陕西省工业科技攻关项目(2016GY-180);陕西省科学研究计划项目(2014K15-03-05)

摘　　要：运用CFD方法、RNG k-ε湍流模型以及多参考系法,在搅拌器内对单个表面曝气装置加以5.23rad/s的角速度旋转的气液两相混合液的水力特性进行数值模拟计算,模拟的曝气装置是由八个叶片单元组成的倒伞形转轮装置,旨在分析和研究该表面曝气搅拌槽内的总体和局部含气率的分布特征以及流场特性。模拟结果表明:搅拌器内的流场呈对称分布,不同位置处的含气率在轴向上的变化规律几乎完全一致,在径向上的变化规律也保持很好的一致性、只有转轮所在区域处含气率沿径向的变化有细微差异。The way of computational fluid dynamics with k-ε turbulence model as well as multiple reference frame method was used to simulate the hydraulic characteristics of gas-liquid mixing flow in a stirred tank installed with an inverted umbrella-type surface aerator. The inverted umbrella aerator consists of eight blades, and rotates at 5.23 rad/s. The main purpose of this simulation is to study the distributions of air volume fraction and characteristics of mixing flow. The simulation results show that the distribution of the mixing flow is symmetrical;the change rules of the gas distribution at different positions along the axis direction are almost the same case and on radial direction keep in good consistency;and only in the region where the surface aerator is installed the gas distribution along the radius has some difference.

关 键 词：表面曝气 气-液两相流 含气率 水力特性 数值模拟 

分 类 号：X131.2[环境科学与工程—环境科学]