Vortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions

The blade vortex evaluation in Francis Turbine under deep part load conditions generates severe pressure ‎fluctuations in the runner. The complex flow in a model turbine is numerically investigated based on a ‎modified Partially Averaged Navier-Stokes method. The main emphasis is focused on revealin...

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Autores principales:	A. Yu, Y. S. Wang, D. Q. Zhou
Formato:	article
Lenguaje:	EN
Publicado:	Isfahan University of Technology 2021
Materias:	francis turbine; vortex evolution; energy production; vorticity transport equation; entropy production ‎theory. Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/a530ee0b4322422d9d98b37cd397ffac
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spelling	oai:doaj.org-article:a530ee0b4322422d9d98b37cd397ffac2021-11-13T07:03:04ZVortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions1735-3572https://doaj.org/article/a530ee0b4322422d9d98b37cd397ffac2021-01-01T00:00:00Zhttp://jafmonline.net/JournalArchive/download?file_ID=56910&issue_ID=1015https://doaj.org/toc/1735-3572The blade vortex evaluation in Francis Turbine under deep part load conditions generates severe pressure ‎fluctuations in the runner. The complex flow in a model turbine is numerically investigated based on a ‎modified Partially Averaged Navier-Stokes method. The main emphasis is focused on revealing the ‎correlation mechanism of blade vortex evolution and energy production. The results indicate that the ‎modified PANS method shows significant advantages in hydro turbine’s simulation than the traditional ‎RANS method. At deep part load conditions, the vorticity formed at the leading edge of the suction ‎surface and the trailing edge of the pressure surface in the blade channels. The stretching term provides ‎the most vorticity increments while the dilation term inhibiting part which only provides a decrement of ‎the vorticity evolution. Based on the entropy production theory, the total entropy production distribution ‎is consisting with the distribution of vorticity. At deep part load condition, direct dissipation and turbulent ‎dissipation provide the most entropy, while at part load condition the proportion of these two-part ‎decreased‎.A. YuY. S. WangD. Q. ZhouIsfahan University of Technology articlefrancis turbine; vortex evolution; energy production; vorticity transport equation; entropy production ‎theory.Mechanical engineering and machineryTJ1-1570ENJournal of Applied Fluid Mechanics, Vol 14, Iss 6, Pp 1669-1678 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	francis turbine; vortex evolution; energy production; vorticity transport equation; entropy production ‎theory. Mechanical engineering and machinery TJ1-1570
spellingShingle	francis turbine; vortex evolution; energy production; vorticity transport equation; entropy production ‎theory. Mechanical engineering and machinery TJ1-1570 A. Yu Y. S. Wang D. Q. Zhou Vortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions
description	The blade vortex evaluation in Francis Turbine under deep part load conditions generates severe pressure ‎fluctuations in the runner. The complex flow in a model turbine is numerically investigated based on a ‎modified Partially Averaged Navier-Stokes method. The main emphasis is focused on revealing the ‎correlation mechanism of blade vortex evolution and energy production. The results indicate that the ‎modified PANS method shows significant advantages in hydro turbine’s simulation than the traditional ‎RANS method. At deep part load conditions, the vorticity formed at the leading edge of the suction ‎surface and the trailing edge of the pressure surface in the blade channels. The stretching term provides ‎the most vorticity increments while the dilation term inhibiting part which only provides a decrement of ‎the vorticity evolution. Based on the entropy production theory, the total entropy production distribution ‎is consisting with the distribution of vorticity. At deep part load condition, direct dissipation and turbulent ‎dissipation provide the most entropy, while at part load condition the proportion of these two-part ‎decreased‎.
format	article
author	A. Yu Y. S. Wang D. Q. Zhou
author_facet	A. Yu Y. S. Wang D. Q. Zhou
author_sort	A. Yu
title	Vortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions
title_short	Vortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions
title_full	Vortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions
title_fullStr	Vortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions
title_full_unstemmed	Vortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions
title_sort	vortex evolution and energy production in the blade ‎channel of a francis turbine operating at deep part ‎load conditions
publisher	Isfahan University of Technology
publishDate	2021
url	https://doaj.org/article/a530ee0b4322422d9d98b37cd397ffac
work_keys_str_mv	AT ayu vortexevolutionandenergyproductioninthebladechannelofafrancisturbineoperatingatdeeppartloadconditions AT yswang vortexevolutionandenergyproductioninthebladechannelofafrancisturbineoperatingatdeeppartloadconditions AT dqzhou vortexevolutionandenergyproductioninthebladechannelofafrancisturbineoperatingatdeeppartloadconditions
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Vortex Evolution and Energy Production in the Blade ‎Channel of a Francis Turbine Operating at Deep Part ‎Load Conditions

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