Investigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification

Abstract The momentum flow exchange between the impeller and side channel produces highly turbulent flows in side channel pumps. The turbulent flows feature complex patterns of vortex structures that are partly responsible for the dissipation of energy losses and unsteady pressure pulsations. The co...

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Autores principales:	Fan Zhang, Desmond Appiah, Ke Chen, Shouqi Yuan, Kofi Asamoah Adu-Poku, Lufeng Zhu
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Side channel pumps Ω-criterion Vortex Entropy loss Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/65d640bc6094407fb11d0d333f175b7a
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spelling	oai:doaj.org-article:65d640bc6094407fb11d0d333f175b7a2021-12-05T12:03:42ZInvestigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification10.1186/s10033-021-00649-11000-93452192-8258https://doaj.org/article/65d640bc6094407fb11d0d333f175b7a2021-12-01T00:00:00Zhttps://doi.org/10.1186/s10033-021-00649-1https://doaj.org/toc/1000-9345https://doaj.org/toc/2192-8258Abstract The momentum flow exchange between the impeller and side channel produces highly turbulent flows in side channel pumps. The turbulent flows feature complex patterns of vortex structures that are partly responsible for the dissipation of energy losses and unsteady pressure pulsations. The concept of turbulent flows in side channel pumps requires a reliable vortex identification criterion to capture and predict the effects of the vortex structures on the performance. For this reason, the current study presents the application of the new Ω-criterion to a side channel pump model in comparison with other traditional methods such as Q and λ 2 criteria. The 3D flow fields of the pump were obtained through unsteady Reynolds-averaged Navier-Stokes (RANS) simulations. Comparative studies showed that the Ω-criterion identifies the vortex of different intensities with a standard threshold, Ω=0.52. The Q and λ 2 criteria required different thresholds to capture vortex of different intensities thus leads to subjective errors. Comparing the Ω-criterion intensity on different planes with the entropy losses and pressure pulsation, the longitudinal vortex plays an important role in the momentum exchange development which increases the head performance of the pump. However, the rate of exchange is impeded by the axial and radial vortices restricted in the impeller. Therefore, the impeller generates the highest entropy loss and pressure pulsation intensities which lower the output efficiency. Finally, the findings provide a fundamental background to the morphology of the vortex structures in the turbulent flows which can be dependent upon for efficiency improvement of side channel pumps.Fan ZhangDesmond AppiahKe ChenShouqi YuanKofi Asamoah Adu-PokuLufeng ZhuSpringerOpenarticleSide channel pumpsΩ-criterionVortexEntropy lossOcean engineeringTC1501-1800Mechanical engineering and machineryTJ1-1570ENChinese Journal of Mechanical Engineering, Vol 34, Iss 1, Pp 1-18 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Side channel pumps Ω-criterion Vortex Entropy loss Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570
spellingShingle	Side channel pumps Ω-criterion Vortex Entropy loss Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570 Fan Zhang Desmond Appiah Ke Chen Shouqi Yuan Kofi Asamoah Adu-Poku Lufeng Zhu Investigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification
description	Abstract The momentum flow exchange between the impeller and side channel produces highly turbulent flows in side channel pumps. The turbulent flows feature complex patterns of vortex structures that are partly responsible for the dissipation of energy losses and unsteady pressure pulsations. The concept of turbulent flows in side channel pumps requires a reliable vortex identification criterion to capture and predict the effects of the vortex structures on the performance. For this reason, the current study presents the application of the new Ω-criterion to a side channel pump model in comparison with other traditional methods such as Q and λ 2 criteria. The 3D flow fields of the pump were obtained through unsteady Reynolds-averaged Navier-Stokes (RANS) simulations. Comparative studies showed that the Ω-criterion identifies the vortex of different intensities with a standard threshold, Ω=0.52. The Q and λ 2 criteria required different thresholds to capture vortex of different intensities thus leads to subjective errors. Comparing the Ω-criterion intensity on different planes with the entropy losses and pressure pulsation, the longitudinal vortex plays an important role in the momentum exchange development which increases the head performance of the pump. However, the rate of exchange is impeded by the axial and radial vortices restricted in the impeller. Therefore, the impeller generates the highest entropy loss and pressure pulsation intensities which lower the output efficiency. Finally, the findings provide a fundamental background to the morphology of the vortex structures in the turbulent flows which can be dependent upon for efficiency improvement of side channel pumps.
format	article
author	Fan Zhang Desmond Appiah Ke Chen Shouqi Yuan Kofi Asamoah Adu-Poku Lufeng Zhu
author_facet	Fan Zhang Desmond Appiah Ke Chen Shouqi Yuan Kofi Asamoah Adu-Poku Lufeng Zhu
author_sort	Fan Zhang
title	Investigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification
title_short	Investigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification
title_full	Investigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification
title_fullStr	Investigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification
title_full_unstemmed	Investigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification
title_sort	investigation on the flow behavior of side channel pumps based on vortex identification
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/65d640bc6094407fb11d0d333f175b7a
work_keys_str_mv	AT fanzhang investigationontheflowbehaviorofsidechannelpumpsbasedonvortexidentification AT desmondappiah investigationontheflowbehaviorofsidechannelpumpsbasedonvortexidentification AT kechen investigationontheflowbehaviorofsidechannelpumpsbasedonvortexidentification AT shouqiyuan investigationontheflowbehaviorofsidechannelpumpsbasedonvortexidentification AT kofiasamoahadupoku investigationontheflowbehaviorofsidechannelpumpsbasedonvortexidentification AT lufengzhu investigationontheflowbehaviorofsidechannelpumpsbasedonvortexidentification
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Investigation on the Flow Behavior of Side Channel Pumps Based on Vortex Identification

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