Title:	Experimental and Numerical Study on Vortical Structures and Their Dynamics in a Pump Sump
Authors:	Uruba, Václav Procházka, Pavel Sedlář, Milan Komárek, Martin Duda, Daniel
Citation:	URUBA, V. PROCHÁZKA, P. SEDLÁŘ, M. KOMÁREK, M. DUDA, D. Experimental and Numerical Study on Vortical Structures and Their Dynamics in a Pump Sump. Water, 2022, roč. 14, č. 13, s. 1-29. ISSN: 2073-4441
Issue Date:	2022
Publisher:	MDPI
Document type:	článek article
URI:	2-s2.0-85133277281 http://hdl.handle.net/11025/51597
ISSN:	2073-4441
Keywords in different language:	pump sump;suction pipe;vortical structure;particle image velocimetry;mathematical modeling
Abstract in different language:	Research on water flow in a pump inlet sump is presented. The main effort has been devoted to the study of the vortical structures’ appearance and their behavior. The study was conducted in a dedicated model of the pump sump consisting of a rectangular tank 1272 × 542 × 550 mm3 with a vertical bellmouth inlet 240 mm in diameter and a close-circuit water loop. Both Computational Fluid Dynamics (CFD) and experimental research methods have been applied. The advanced unsteady approach has been used for mathematical modeling to capture the flow-field dynamics. For experiments, the time-resolved Particle Image Velocimetry (PIV) method has been utilized. The mathematical modeling has been validated against the obtained experimental data; the main vortex core circulation is captured within 3%, while the overall flow topology is validated qualitatively. Three types of vortical structures have been detected: surface vortices, wall-attached vortices and bottom vortex. The most intense and stable is the bottom vortex; the surface and wall-attached vortices are found to be of random nature, both in their appearance and topology; they appear intermittently in time with various topologies. The dominant bottom vortex is relatively steady with weak, low-frequency dynamics; typical frequencies are up to 1 Hz. The origin of the vorticity of all large vortical structures is identified in the pump propeller rotation.
Rights:	© authors
Appears in Collections:	Články / Articles (KKE) Články / Articles (CEV) OBD

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