Emergency gate closing in a Kaplan turbine intake for runaway condition: CFD transient study for two-phase flow and experimental validation

In order to prevent a turbine to reach its runaway speed when load rejection occurs, an emergency closing system must be devised in case the regulation system fails. For Kaplan turbines, fixed wheel gates located in the turbine intake or in the draft tube outlet are usually employed. Gates of this t...

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Autores principales:	Rivetti, Arturo, Angarita, G, Angulo, Mauricio Abel, Botero, Francisco, Liscia, Sergio Oscar
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2021
Materias:	Ingeniería Kaplan turbine Emergency closing system
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/127962
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-127962
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ingeniería Kaplan turbine Emergency closing system
spellingShingle	Ingeniería Kaplan turbine Emergency closing system Rivetti, Arturo Angarita, G Angulo, Mauricio Abel Botero, Francisco Liscia, Sergio Oscar Emergency gate closing in a Kaplan turbine intake for runaway condition: CFD transient study for two-phase flow and experimental validation
topic_facet	Ingeniería Kaplan turbine Emergency closing system
description	In order to prevent a turbine to reach its runaway speed when load rejection occurs, an emergency closing system must be devised in case the regulation system fails. For Kaplan turbines, fixed wheel gates located in the turbine intake or in the draft tube outlet are usually employed. Gates of this type are move by gravity and the closing velocity is controlled by gantry cranes. The closing maneuver is complex due to the high flow rates inherent to runaway conditions and the rotational deceleration during the gate's closing time. Research on this topic is scarce and limited, and numerical studies are usually clouded by uncertainties concerning the setting of proper boundary conditions. In this work, the closing maneuver of the emergency fixed wheel gates at the intake of a Kaplan turbine was studied with CFD two-phase transient simulation. The software used was ANSYS CFX, that solves unsteady Navier-Stokes equations (URANS) by means of the finite volume method. The simulated domain includes a 2D case from one of the span of the semi-spiral casing and a 3D case of a complete span. Two types of simulation were considered, namely: quasi-steady state, where the position of the gate is fixed; and full transient state, where the gate movement was modelled by an immersed solid model. In search of the optimum model layout with its set of boundary conditions, numerical results were compared and validated against experiments performed on a physical scale model in accordance with IEC 60193 norms for several turbulence models. Results show that the pull-up force on the gate increases as it is being closed. Analysis of pressure fluctuation at different points of the gate suggest that the main frequency component is the vortex shedding of the gate lip.
format	Articulo Articulo
author	Rivetti, Arturo Angarita, G Angulo, Mauricio Abel Botero, Francisco Liscia, Sergio Oscar
author_facet	Rivetti, Arturo Angarita, G Angulo, Mauricio Abel Botero, Francisco Liscia, Sergio Oscar
author_sort	Rivetti, Arturo
title	Emergency gate closing in a Kaplan turbine intake for runaway condition: CFD transient study for two-phase flow and experimental validation
title_short	Emergency gate closing in a Kaplan turbine intake for runaway condition: CFD transient study for two-phase flow and experimental validation
title_full	Emergency gate closing in a Kaplan turbine intake for runaway condition: CFD transient study for two-phase flow and experimental validation
title_fullStr	Emergency gate closing in a Kaplan turbine intake for runaway condition: CFD transient study for two-phase flow and experimental validation
title_full_unstemmed	Emergency gate closing in a Kaplan turbine intake for runaway condition: CFD transient study for two-phase flow and experimental validation
title_sort	emergency gate closing in a kaplan turbine intake for runaway condition: cfd transient study for two-phase flow and experimental validation
publishDate	2021
url	http://sedici.unlp.edu.ar/handle/10915/127962
work_keys_str_mv	AT rivettiarturo emergencygateclosinginakaplanturbineintakeforrunawayconditioncfdtransientstudyfortwophaseflowandexperimentalvalidation AT angaritag emergencygateclosinginakaplanturbineintakeforrunawayconditioncfdtransientstudyfortwophaseflowandexperimentalvalidation AT angulomauricioabel emergencygateclosinginakaplanturbineintakeforrunawayconditioncfdtransientstudyfortwophaseflowandexperimentalvalidation AT boterofrancisco emergencygateclosinginakaplanturbineintakeforrunawayconditioncfdtransientstudyfortwophaseflowandexperimentalvalidation AT lisciasergiooscar emergencygateclosinginakaplanturbineintakeforrunawayconditioncfdtransientstudyfortwophaseflowandexperimentalvalidation
bdutipo_str	Repositorios
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Emergency gate closing in a Kaplan turbine intake for runaway condition: CFD transient study for two-phase flow and experimental validation

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