Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load Rejection

During the load rejection transient process of the prototype pump turbine units, the pressure fluctuations of the entire flow passage change drastically due to the rapid closing of guide vanes. The extremely unsteady pressure distribution in the flow domains including the crown chamber and the band...

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Main Authors: Qilian He, Xingxing Huang, Mengqi Yang, Haixia Yang, Huili Bi, Zhengwei Wang
Format: Article
Language:English
Published: MDPI AG 2022-05-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/15/10/3764
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author Qilian He
Xingxing Huang
Mengqi Yang
Haixia Yang
Huili Bi
Zhengwei Wang
author_facet Qilian He
Xingxing Huang
Mengqi Yang
Haixia Yang
Huili Bi
Zhengwei Wang
author_sort Qilian He
collection DOAJ
description During the load rejection transient process of the prototype pump turbine units, the pressure fluctuations of the entire flow passage change drastically due to the rapid closing of guide vanes. The extremely unsteady pressure distribution in the flow domains including the crown chamber and the band chamber may cause a strong vibration on the stationary structures of the unit and result in large dynamic stress on the head cover, stay ring and bottom ring. In this paper, the numerical fluid dynamic analysis of the entire flow passage of a reversible prototype pump turbine during load rejection was performed. The flow characteristics in the runner passage, crown chamber, band chamber, seal labyrinths and balance tubes are analysed. The corresponding unsteady flow-induced dynamic behaviour of the head cover, stay vanes and bottom ring was investigated in detail. The analysed results show that the total deformation of the inner edge of the head cover closed to the main shaft is larger than that of other stationary structures of the unit during the load rejection. The maximum stress of the stay ring is larger than that of the head cover and the bottom ring and the maximum equivalent stress is located at the fillet of the stay vane trailing edge. The fluid–structure coupling calculation method and the analysed results can provide guidance for the design of stationary components of hydraulic machinery such as pump turbines, Francis turbines and centrifugal pumps with different heads.
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spelling doaj.art-d07fd63e5293411395af29426871fe552023-11-23T10:52:48ZengMDPI AGEnergies1996-10732022-05-011510376410.3390/en15103764Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load RejectionQilian He0Xingxing Huang1Mengqi Yang2Haixia Yang3Huili Bi4Zhengwei Wang5Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, ChinaS.C.I.Energy, Future Energy Research Institute, Seidengasse 17, 8706 Zurich, SwitzerlandBranch Company of Maintenance & Test, CSG Power Generation Co., Ltd., Guangzhou 511400, ChinaBranch Company of Maintenance & Test, CSG Power Generation Co., Ltd., Guangzhou 511400, ChinaDepartment of Energy and Power Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Energy and Power Engineering, Tsinghua University, Beijing 100084, ChinaDuring the load rejection transient process of the prototype pump turbine units, the pressure fluctuations of the entire flow passage change drastically due to the rapid closing of guide vanes. The extremely unsteady pressure distribution in the flow domains including the crown chamber and the band chamber may cause a strong vibration on the stationary structures of the unit and result in large dynamic stress on the head cover, stay ring and bottom ring. In this paper, the numerical fluid dynamic analysis of the entire flow passage of a reversible prototype pump turbine during load rejection was performed. The flow characteristics in the runner passage, crown chamber, band chamber, seal labyrinths and balance tubes are analysed. The corresponding unsteady flow-induced dynamic behaviour of the head cover, stay vanes and bottom ring was investigated in detail. The analysed results show that the total deformation of the inner edge of the head cover closed to the main shaft is larger than that of other stationary structures of the unit during the load rejection. The maximum stress of the stay ring is larger than that of the head cover and the bottom ring and the maximum equivalent stress is located at the fillet of the stay vane trailing edge. The fluid–structure coupling calculation method and the analysed results can provide guidance for the design of stationary components of hydraulic machinery such as pump turbines, Francis turbines and centrifugal pumps with different heads.https://www.mdpi.com/1996-1073/15/10/3764pump turbinehead coverload rejectionfluid–structure couplingstress concentration
spellingShingle Qilian He
Xingxing Huang
Mengqi Yang
Haixia Yang
Huili Bi
Zhengwei Wang
Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load Rejection
Energies
pump turbine
head cover
load rejection
fluid–structure coupling
stress concentration
title Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load Rejection
title_full Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load Rejection
title_fullStr Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load Rejection
title_full_unstemmed Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load Rejection
title_short Fluid–Structure Coupling Analysis of the Stationary Structures of a Prototype Pump Turbine during Load Rejection
title_sort fluid structure coupling analysis of the stationary structures of a prototype pump turbine during load rejection
topic pump turbine
head cover
load rejection
fluid–structure coupling
stress concentration
url https://www.mdpi.com/1996-1073/15/10/3764
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AT mengqiyang fluidstructurecouplinganalysisofthestationarystructuresofaprototypepumpturbineduringloadrejection
AT haixiayang fluidstructurecouplinganalysisofthestationarystructuresofaprototypepumpturbineduringloadrejection
AT huilibi fluidstructurecouplinganalysisofthestationarystructuresofaprototypepumpturbineduringloadrejection
AT zhengweiwang fluidstructurecouplinganalysisofthestationarystructuresofaprototypepumpturbineduringloadrejection