A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine

In recent times, optimization began to be popular in the turbomachinery field. The development of computational fluid dynamics (CFD) analysis and optimization technology provides the opportunity to maximize the performance of hydro turbines. The optimization techniques are focused mainly on the rota...

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Main Authors:	Ujjwal Shrestha, Young-Do Choi
Format:	Article
Language:	English
Published:	MDPI AG 2020-10-01
Series:	Processes
Subjects:	CFD shape optimization Francis turbine fixed flow passage flow uniformity
Online Access:	https://www.mdpi.com/2227-9717/8/11/1392

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spelling	doaj-d0141c09ca844b239b41f42c4c8af7782020-11-25T04:08:11ZengMDPI AGProcesses2227-97172020-10-0181392139210.3390/pr8111392A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro TurbineUjjwal Shrestha0Young-Do Choi1Graduate School of Mechanical Engineering, Mokpo National University, Muan 58554, KoreaDepartment of Mechanical Engineering, Institute of New and Renewable Energy Technology Research, Mokpo National University, Muan 58554, KoreaIn recent times, optimization began to be popular in the turbomachinery field. The development of computational fluid dynamics (CFD) analysis and optimization technology provides the opportunity to maximize the performance of hydro turbines. The optimization techniques are focused mainly on the rotating components (runner and guide vane) of the hydro turbines. Meanwhile, fixed flow passages (stay vane, casing, and draft tube) are essential parts for the proper flow uniformity in the hydro turbines. The suppression of flow instabilities in the fixed flow passages is an inevitable process to ensure the power plant safety by the reduction of vortex-induced vibration and pressure pulsation in the hydro turbines. In this study, a CFD-based shape design optimization process is proposed with response surface methodology (RSM) to improve the flow uniformity in the fixed flow passages of a Francis hydro turbine model. The internal flow behaviors were compared between the initial and optimal shapes of the stay vane, casing, and the draft tube with J-Groove. The optimal shape design process for the fixed flow passages proved its remarkable effects on the improvement of flow uniformity in the Francis hydro turbine.https://www.mdpi.com/2227-9717/8/11/1392CFDshape optimizationFrancis turbinefixed flow passageflow uniformity
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Ujjwal Shrestha Young-Do Choi
spellingShingle	Ujjwal Shrestha Young-Do Choi A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine Processes CFD shape optimization Francis turbine fixed flow passage flow uniformity
author_facet	Ujjwal Shrestha Young-Do Choi
author_sort	Ujjwal Shrestha
title	A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine
title_short	A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine
title_full	A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine
title_fullStr	A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine
title_full_unstemmed	A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine
title_sort	cfd-based shape design optimization process of fixed flow passages in a francis hydro turbine
publisher	MDPI AG
series	Processes
issn	2227-9717
publishDate	2020-10-01
description	In recent times, optimization began to be popular in the turbomachinery field. The development of computational fluid dynamics (CFD) analysis and optimization technology provides the opportunity to maximize the performance of hydro turbines. The optimization techniques are focused mainly on the rotating components (runner and guide vane) of the hydro turbines. Meanwhile, fixed flow passages (stay vane, casing, and draft tube) are essential parts for the proper flow uniformity in the hydro turbines. The suppression of flow instabilities in the fixed flow passages is an inevitable process to ensure the power plant safety by the reduction of vortex-induced vibration and pressure pulsation in the hydro turbines. In this study, a CFD-based shape design optimization process is proposed with response surface methodology (RSM) to improve the flow uniformity in the fixed flow passages of a Francis hydro turbine model. The internal flow behaviors were compared between the initial and optimal shapes of the stay vane, casing, and the draft tube with J-Groove. The optimal shape design process for the fixed flow passages proved its remarkable effects on the improvement of flow uniformity in the Francis hydro turbine.
topic	CFD shape optimization Francis turbine fixed flow passage flow uniformity
url	https://www.mdpi.com/2227-9717/8/11/1392
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A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine

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