倒伞型曝气头气液两相流场数值模拟研究  

Numerical simulation of gas-liquid two-phase flow field of inverted umbrella aerator in aeration tank

作　　者：胡钰贤[1] 贾冬冬 郭亚兵[1] 陈兵[2] HU Yu-xian;JIA Dong-dong;GUO Ya-bing;CHEN Bing(School of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan 030024,China;Northern Institute of Automatic Control Technology,Taiyuan 030009,China)

机构地区：[1]太原科技大学环境与安全学院,太原030024 [2]北方自动控制技术研究所,太原030009

出　　处：《广西大学学报（自然科学版）》2019年第5期1384-1391,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然基金项目(21606157);山西省高等学校教学改革创新项目(J2017081);太原科技大学教学改革项目(201734)

摘　　要：针对倒伞型曝气头曝气池中不同的叶轮设计下流场的变化问题,研究利用ANSYS CFX仿真软件的模型,模拟分析Landy7和Hubert表曝机的曝气池内气液两相的混合流场的水力学特性。结果显示,Landy7与Hubert叶轮背面所形成的最大负压分别为3 132.7 Pa和16 179.5 Pa;观察两种结构表曝机驱动液体自由表面的最大速度,Landy7可达0.623 m/s,Hubert为0.192 m/s,随着液体深度的增加该速度逐渐减小。对比分析两种结构表曝机的模拟流场的变化,Landy7对流场的影响较大。此研究初步分析了曝气头负压的抽吸特征,通过表曝头对流场的搅拌、推动作用分析为实验及设备优化提供指导,为倒伞型曝气头的改造及优化提供依据。The ANSYS CFX simulation software was used to simulate and analyze the hydraulic characteristics of gas-liquid mixed flow field in the aeration tank.The inverted umbrella Landy7 and Hubert Aerator were simulated to research variations in different impeller designs.The results show that the maximum negative pressure on the back of Landy-7 and Hubert impellers are 3132.7 Pa and 16179.5 Pa respectively.Observing the maximum velocity of liquid free surface driven by two kinds of surface aerators,the Landy-7 can reach 0.623 m/s,Hubert is 0.192 m/s.The velocity decreases with the increase of liquid depth.Compared and analyzed the changes of flow field of the two structure surface aerators,Landy7 had a greater impact on the flow field.The preliminary studies analyzed the suction characters caused by the negative pressure of aerator,and provided guidance for the optimizations of experiments and equipments.It provided the basis for the improvement and optimization of the inverted umbrella aerator.

关 键 词：倒伞型曝气头 ANSYS CFX 两相流场 

分 类 号：X703.3[环境科学与工程—环境工程]