Particle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine

Hydropower units are usually operated in non-design conditions because of power grid requirements. In a partial-load condition, an inter-blade vortex phenomenon occurs between the runner blades of a Francis turbine, causing pressure pulsation and unit vibration, which hinder the safe and stable oper...

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Autores principales:	Lianchen Xu, Xiaohui Jin, Zhen Li, Wanquan Deng, Demin Liu, Xiaobing Liu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Francis turbine inter-blade vortex particle image velocimetry experimental research Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/464ef514ab5a4df1ab871016b6c5da3b
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id	oai:doaj.org-article:464ef514ab5a4df1ab871016b6c5da3b
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spelling	oai:doaj.org-article:464ef514ab5a4df1ab871016b6c5da3b2021-11-25T18:50:58ZParticle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine10.3390/pr91119682227-9717https://doaj.org/article/464ef514ab5a4df1ab871016b6c5da3b2021-11-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1968https://doaj.org/toc/2227-9717Hydropower units are usually operated in non-design conditions because of power grid requirements. In a partial-load condition, an inter-blade vortex phenomenon occurs between the runner blades of a Francis turbine, causing pressure pulsation and unit vibration, which hinder the safe and stable operation of power stations. However, the mechanism through which the inter-blade vortex generation occurs is not entirely clear. In this study, a specific model of the Francis turbine was used to investigate and visually observe the generation of the blade vortex in Francis turbines in both the initial inter-blade and vortex development zones. Particle image velocimetry was used for this purpose. In addition, we determined the variation law of the inter-blade vortex in the Francis turbine. We found that the size and strength of the inter-blade vortex depend on the unit speed of the turbine. The higher the unit speed is, the stronger the inter-blade vortex becomes. We concluded that the inter-blade vortex of such turbines originates from the pressure surface or secondary flow and stall of the blade at the inlet side of the runner at high unit speeds, and also from the backflow zone of the suction surface of the blade at low unit speeds.Lianchen XuXiaohui JinZhen LiWanquan DengDemin LiuXiaobing LiuMDPI AGarticleFrancis turbineinter-blade vortexparticle image velocimetryexperimental researchChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1968, p 1968 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Francis turbine inter-blade vortex particle image velocimetry experimental research Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	Francis turbine inter-blade vortex particle image velocimetry experimental research Chemical technology TP1-1185 Chemistry QD1-999 Lianchen Xu Xiaohui Jin Zhen Li Wanquan Deng Demin Liu Xiaobing Liu Particle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine
description	Hydropower units are usually operated in non-design conditions because of power grid requirements. In a partial-load condition, an inter-blade vortex phenomenon occurs between the runner blades of a Francis turbine, causing pressure pulsation and unit vibration, which hinder the safe and stable operation of power stations. However, the mechanism through which the inter-blade vortex generation occurs is not entirely clear. In this study, a specific model of the Francis turbine was used to investigate and visually observe the generation of the blade vortex in Francis turbines in both the initial inter-blade and vortex development zones. Particle image velocimetry was used for this purpose. In addition, we determined the variation law of the inter-blade vortex in the Francis turbine. We found that the size and strength of the inter-blade vortex depend on the unit speed of the turbine. The higher the unit speed is, the stronger the inter-blade vortex becomes. We concluded that the inter-blade vortex of such turbines originates from the pressure surface or secondary flow and stall of the blade at the inlet side of the runner at high unit speeds, and also from the backflow zone of the suction surface of the blade at low unit speeds.
format	article
author	Lianchen Xu Xiaohui Jin Zhen Li Wanquan Deng Demin Liu Xiaobing Liu
author_facet	Lianchen Xu Xiaohui Jin Zhen Li Wanquan Deng Demin Liu Xiaobing Liu
author_sort	Lianchen Xu
title	Particle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine
title_short	Particle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine
title_full	Particle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine
title_fullStr	Particle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine
title_full_unstemmed	Particle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine
title_sort	particle image velocimetry test for the inter-blade vortex in a francis turbine
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/464ef514ab5a4df1ab871016b6c5da3b
work_keys_str_mv	AT lianchenxu particleimagevelocimetrytestfortheinterbladevortexinafrancisturbine AT xiaohuijin particleimagevelocimetrytestfortheinterbladevortexinafrancisturbine AT zhenli particleimagevelocimetrytestfortheinterbladevortexinafrancisturbine AT wanquandeng particleimagevelocimetrytestfortheinterbladevortexinafrancisturbine AT deminliu particleimagevelocimetrytestfortheinterbladevortexinafrancisturbine AT xiaobingliu particleimagevelocimetrytestfortheinterbladevortexinafrancisturbine
_version_	1718410643996934144

Particle Image Velocimetry Test for the Inter-Blade Vortex in a Francis Turbine

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