The influence of water level and flow rate on vortex occurrence in pump sump
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A pump sump is an indispensable facility in cargo ships, irrigation, drainage, agriculture and industrial processes. The water intake conditions around suction bell mouth significantly affect the performance of the whole pumping system. However, there are different types of undesirable vortices that occur in pump sump, such as submerged vortex and air entraining vortex. Accompanying with the variety of vortex, noise and vibration also appears. In this study, a scaled down model of a pump sump was designed and constructed. The occurrence of the vortex was the concentrated target which was investigated under various suction pipe inlet conditions. With different water levels, flow rates and a fixed distance from the bottom to suction pipe bell mouth, detailed experiments were conducted. Additionally, a computational fluid dynamics (CFD) analysis was performed, verifying the influence of water level and flow rate on visualization and formation of vortex obtained in the experiment. The CFD analysis results were compared with those of the experiment.
Abstract
A pump sump is an indispensable facility in cargo ships, irrigation, drainage, agriculture and industrial processes. The water intake conditions around suction bell mouth significantly affect the performance of the whole pumping system. However, there are different types of undesirable vortices that occur in pump sump, such as submerged vortex and air entraining vortex. Accompanying with the variety of vortex, noise and vibration also appears. In this study, a scaled down model of a pump sump was designed and constructed. The occurrence of the vortex was the concentrated target which was investigated under various suction pipe inlet conditions. With different water levels, flow rates and a fixed distance from the bottom to suction pipe bell mouth, detailed experiments were conducted. Additionally, a computational fluid dynamics (CFD) analysis was performed, verifying the influence of water level and flow rate on visualization and formation of vortex obtained in the experiment. The CFD analysis results were compared with those of the experiment.
참고문헌 (8)
- Turbomachinery Society of Japan, "Standard Method for Model Testing the Performance of a Pump Sump", TSJ S002, ~ (2005)
- Hydraulic Institute, "American National Standard for Pump Intake Design", ANSI, 2000
- J. Matsui, "CFD benchmark and a model experiment on the flow in a pump sump", Proceeding of 23rd IAHR symposium on Hydraulic Machinery and Systems (2006)
- L. Cecilia, "Vortex detection in pump sumps by means of CFD", Proceeding of 25th IAHR symposium on Hydraulic Machinery and Systems (2010)
- A. C. Bayeul, "Two-phase numerical study of the flow field formed in water pump sump: Influence of air entrainment", Proceeding of 26th IAHR symposium on Hydraulic Machinery and Systems (2012)
- 이영범, "The effect of suction pipe leaning angle on the internal flow of pump sump", 한국마린엔지니어링학회지, 39(8), pp.849~855 (2015), 한국마린엔지니어링학회[DOI]
- C. G. Kim, "A study on the effectiveness of an anti vortex device in the sump model by experiment and CFD", Proceeding of 26th IAHR symposium on Hydraulic Machinery and Systems (2012)
- "ANSYS CFX Documentation, Ver. 18.1"[URL]