Prediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis

In case of disconnection of generator from the network and failure of the governor, the rotational speed of the rotor rapidly increases and achieves maximum value, called the runaway speed. Prediction of the runaway speed at the stage of runner design would allow to select a runner considering this...

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Autores principales:	Semenova A. V., Chirkov D. V., Ustimenko A. S.
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/c1d74dc458074821ac1ed85107a14372
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spelling	oai:doaj.org-article:c1d74dc458074821ac1ed85107a143722021-11-12T11:44:23ZPrediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis2267-124210.1051/e3sconf/202132004008https://doaj.org/article/c1d74dc458074821ac1ed85107a143722021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/96/e3sconf_esei2021_04008.pdfhttps://doaj.org/toc/2267-1242In case of disconnection of generator from the network and failure of the governor, the rotational speed of the rotor rapidly increases and achieves maximum value, called the runaway speed. Prediction of the runaway speed at the stage of runner design would allow to select a runner considering this characteristic. Given in this paper is the numerical prediction of the runaway speed for a Kaplan turbine. Two approaches for numerical simulation were discussed. In the first one, the flow in the turbine flow passage was simulated using 3-D RANS equations of incompressible fluid using k-ε turbulence model. In the second approach, cavitation phenomena were taken into account using two-phase Zwart-Gerber-Belamri (ZGB) cavitation model. CFD calculations were carried out with using CADRUN flow solver. When setting the boundary conditions, the turbine head, being the difference of energies in the inlet and outlet cross-sections, is pre-set as a constant value, while the discharge and the runner torque are determined in the process of computation. The computed runaway speed is compared to that obtained in the model tests. It is shown that the numerical prediction of the runaway speed using the cavitation model achieves better matching with the experimental data.Semenova A. V.Chirkov D. V.Ustimenko A. S.EDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 320, p 04008 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Semenova A. V. Chirkov D. V. Ustimenko A. S. Prediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis
description	In case of disconnection of generator from the network and failure of the governor, the rotational speed of the rotor rapidly increases and achieves maximum value, called the runaway speed. Prediction of the runaway speed at the stage of runner design would allow to select a runner considering this characteristic. Given in this paper is the numerical prediction of the runaway speed for a Kaplan turbine. Two approaches for numerical simulation were discussed. In the first one, the flow in the turbine flow passage was simulated using 3-D RANS equations of incompressible fluid using k-ε turbulence model. In the second approach, cavitation phenomena were taken into account using two-phase Zwart-Gerber-Belamri (ZGB) cavitation model. CFD calculations were carried out with using CADRUN flow solver. When setting the boundary conditions, the turbine head, being the difference of energies in the inlet and outlet cross-sections, is pre-set as a constant value, while the discharge and the runner torque are determined in the process of computation. The computed runaway speed is compared to that obtained in the model tests. It is shown that the numerical prediction of the runaway speed using the cavitation model achieves better matching with the experimental data.
format	article
author	Semenova A. V. Chirkov D. V. Ustimenko A. S.
author_facet	Semenova A. V. Chirkov D. V. Ustimenko A. S.
author_sort	Semenova A. V.
title	Prediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis
title_short	Prediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis
title_full	Prediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis
title_fullStr	Prediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis
title_full_unstemmed	Prediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis
title_sort	prediction of runaway characteristics of kaplan turbines using cfd analysis
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/c1d74dc458074821ac1ed85107a14372
work_keys_str_mv	AT semenovaav predictionofrunawaycharacteristicsofkaplanturbinesusingcfdanalysis AT chirkovdv predictionofrunawaycharacteristicsofkaplanturbinesusingcfdanalysis AT ustimenkoas predictionofrunawaycharacteristicsofkaplanturbinesusingcfdanalysis
_version_	1718430577973002240

Prediction of Runaway Characteristics of Kaplan Turbines Using CFD Analysis

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