Numerical Analysis of Vortices Behavior in a Pump Sump

29th IAHR Symposium on Hydraulic Machinery and Systems

Amin, Ayham^1 ; Kim, Byung Ha^1 ; Kim, Chang Gu^2 ; Lee, Young Ho^3

Department of Mechanical Engineering, Korea Maritime and Ocean University, Busan, Korea, Republic of^1

Brain Korea 21 Plus, Korea Maritime and Ocean University, Busan, Korea, Republic of^2

Divisions of Mechanical Engineering, Korea Maritime and Ocean University, Busan, Korea, Republic of^3

关键词: Free-surface vortices;    Numerical and experimental analysis;    Pump efficiency;    Pump sump;    Structure design;    Swirl angles;    Tangential velocities;    Vortex formation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/3/032020/pdf
DOI  :  10.1088/1755-1315/240/3/032020

来源: IOP

【 摘 要 】

A Pump sump or intake is a hydraulic structure with specific dimensions used to contain the water which has to be pumped into the piping system. Recently, the designers and engineers of pump station realized that the efficiency of pump station largely depends on sump structure design, not only on the performance of the selected pump. However, the poor intake design may result in many undesirable phenomena such as a form of swirl and vortices, which lead to affect the pump efficiency. In this study, both numerical and experimental analysis of a rectangular pump sump was carried out to predict swirl angle and free surface vortices formation. The swirl angle experimentally was obtained using a traditional swirl meter installed at the suction pipe in rectangular single pump intake. The objective was to obtain the average tangential velocity at different suction pipe diameter. For free surface vortices the objective was to observe the different vortex formation, air entrance and location. The swirl angle and average tangential velocity estimated by CFD simulation was in agreement with experimental results. The four types of free surface vortices (Surface swirl, Surface dimple, air bubbles and full air core to intake) was also observed clearly in ANSYS CFX.