二级泵房吸水井不同高度液位的CFD数值模拟  

CFD Numerical Simulation of Different Height Liquid Levels in Suction Wells of Secondary Pumping Station

作　　者：王胜己 WANG Shengji(Shanghai Municipal Engineering Design InstituteCo.,Ltd.,Shanghai200092,China)

机构地区：[1]上海市政工程设计研究总院<集团>有限公司,上海200092

出　　处：《净水技术》2022年第1期115-120,共6页Water Purification Technology

摘　　要：针对某工程实例二级泵房吸水井运行液位过高的问题,采用CFD数值模拟研究二级泵房吸水井不同高度液位对吸水效果的影响,以得出最低运行液位的判定依据和标准,同时得出有效降低最低运行液位的设计思路。运用Ansys软件建立CFD数值模拟模型,通过合理的网格划分进行流体流动仿真,对同种模型的不同液位高度和同种液位高度的不同模型分别进行了数值模拟,对比分析流场、压力场及引入湍流黏度场,以判定清水池最低运行液位。结果表明:实际运行中可将最低运行液位降低至少0.3 m,当采取增加隔板和设置45°弯头的措施时,可将清水池最低运行液位降低0.6 m。引入湍流黏度进行数值模拟,可较准确快速模拟分析该类问题,采用增加隔板和设置弯头的措施可有效降低最低运行液位。Aiming at the problem of excessively high operating water level of the secondary pump house suction well in the engineering example, CFD numerical simulation method was used to study the influence of different heights of the secondary pump house suction well on water suction effect, so as to obtain the basis for determining minimum operating level. At the same time, design ideas that can effectively reduce minimum operating water level were drawn. CFD numerical simulation software Ansys was used to establish the model, and fluid flow was simulated through reasonable grid generation. Different liquid level heights of the same model and different models of the same liquid level height were numerically simulated. By comparing and analyzing flow field, pressure field and turbulent viscosity field to determine the minimum operating level of clean water tank. Results showed that minimum operating water level could be reduced by at least 0.3 m in the actual operation of the project. When the measures of increasing the partition and setting 45° elbow were taken, the minimum operating water level of the clean water tank could be reduced by 0.6 m. The introduction of turbulent viscosity for numerical simulation can simulate and analyze this type of problems more accurately and quickly. The measures of adding partitions and setting elbows can effectively reduce minimum operating water level.

关 键 词：计算流体力学(CFD) 吸水井 压力 湍流黏度 最低运行液位 

分 类 号：TU991[建筑科学—市政工程]