Experimental Research on the Rotating Stall of a Pump Turbine in Pump Mode

The rotating stall is an unstable flow phenomenon of pump turbines in pump mode, which is of increasing concern to scientists and engineers working on pump turbines. However, at present, various studies are carried out based on CFD (computational fluid dynamics) simulation, while directly measured d...

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Veröffentlicht in:Water (Basel) 2019-11, Vol.11 (11), p.2426
Hauptverfasser: Xue, Peng, Liu, Zhiping, Lu, Li, Gao, Zhongxin, Meng, Xiaochao
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container_issue 11
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creator Xue, Peng
Liu, Zhiping
Lu, Li
Gao, Zhongxin
Meng, Xiaochao
description The rotating stall is an unstable flow phenomenon of pump turbines in pump mode, which is of increasing concern to scientists and engineers working on pump turbines. However, at present, various studies are carried out based on CFD (computational fluid dynamics) simulation, while directly measured data and experimental research on flow fields are seldom reported. By utilizing PIV (particle image velocimetry) measuring equipment, the flow field within the guide vane zone of a low specific speed pump turbine in pump mode was measured. By measuring and analyzing the transient flow field, the evolutionary process of the rotating stall within the guide vane passages was determined. We found that for all three tested guide vane openings, regardless of whether the positive slope appeared or not, a pre-stall operating point was found for each opening in the process of decreasing the flow rate. The analysis of the loss within the flow field indicated that the dissipation-induced loss increased greatly after the rotating stall appeared. The pump performance curves at the three guide vane openings showed an inflection at the pre-stall point. When the flow rate is larger than that of the pre-stall point, the head of the pump turbine dramatically increases as the flow rate decreases. However, when the flow rate is smaller than the pre-stall point, such increases noticeably slows down. The research results showed that whether the positive slope on the pump performance curve occurred or not, instability caused by the rotating stall should be of great concern.
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However, at present, various studies are carried out based on CFD (computational fluid dynamics) simulation, while directly measured data and experimental research on flow fields are seldom reported. By utilizing PIV (particle image velocimetry) measuring equipment, the flow field within the guide vane zone of a low specific speed pump turbine in pump mode was measured. By measuring and analyzing the transient flow field, the evolutionary process of the rotating stall within the guide vane passages was determined. We found that for all three tested guide vane openings, regardless of whether the positive slope appeared or not, a pre-stall operating point was found for each opening in the process of decreasing the flow rate. The analysis of the loss within the flow field indicated that the dissipation-induced loss increased greatly after the rotating stall appeared. The pump performance curves at the three guide vane openings showed an inflection at the pre-stall point. When the flow rate is larger than that of the pre-stall point, the head of the pump turbine dramatically increases as the flow rate decreases. However, when the flow rate is smaller than the pre-stall point, such increases noticeably slows down. The research results showed that whether the positive slope on the pump performance curve occurred or not, instability caused by the rotating stall should be of great concern.</description><identifier>ISSN: 2073-4441</identifier><identifier>EISSN: 2073-4441</identifier><identifier>DOI: 10.3390/w11112426</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Computational fluid dynamics ; Computer applications ; Experimental research ; Flow rates ; Flow velocity ; Fluid dynamics ; Hydrodynamics ; Lasers ; Measurement techniques ; Mechanical properties ; Particle image velocimetry ; Pump turbines ; Research methodology ; Reynolds number ; Rotating stalls ; Simulation ; Testing ; Turbines ; Turbulence models ; Unsteady flow ; Working conditions</subject><ispartof>Water (Basel), 2019-11, Vol.11 (11), p.2426</ispartof><rights>COPYRIGHT 2019 MDPI AG</rights><rights>2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). 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However, at present, various studies are carried out based on CFD (computational fluid dynamics) simulation, while directly measured data and experimental research on flow fields are seldom reported. By utilizing PIV (particle image velocimetry) measuring equipment, the flow field within the guide vane zone of a low specific speed pump turbine in pump mode was measured. By measuring and analyzing the transient flow field, the evolutionary process of the rotating stall within the guide vane passages was determined. We found that for all three tested guide vane openings, regardless of whether the positive slope appeared or not, a pre-stall operating point was found for each opening in the process of decreasing the flow rate. The analysis of the loss within the flow field indicated that the dissipation-induced loss increased greatly after the rotating stall appeared. The pump performance curves at the three guide vane openings showed an inflection at the pre-stall point. When the flow rate is larger than that of the pre-stall point, the head of the pump turbine dramatically increases as the flow rate decreases. However, when the flow rate is smaller than the pre-stall point, such increases noticeably slows down. The research results showed that whether the positive slope on the pump performance curve occurred or not, instability caused by the rotating stall should be of great concern.</description><subject>Computational fluid dynamics</subject><subject>Computer applications</subject><subject>Experimental research</subject><subject>Flow rates</subject><subject>Flow velocity</subject><subject>Fluid dynamics</subject><subject>Hydrodynamics</subject><subject>Lasers</subject><subject>Measurement techniques</subject><subject>Mechanical properties</subject><subject>Particle image velocimetry</subject><subject>Pump turbines</subject><subject>Research methodology</subject><subject>Reynolds number</subject><subject>Rotating stalls</subject><subject>Simulation</subject><subject>Testing</subject><subject>Turbines</subject><subject>Turbulence models</subject><subject>Unsteady flow</subject><subject>Working conditions</subject><issn>2073-4441</issn><issn>2073-4441</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpNUE1PwzAMjRBITGMH_kEkThw6kibp0uM0jS8NgcY4V2nibJ3apKStgH9PUBHCPth-fv7QQ-iSkjljObn5oNFSnmYnaJKSBUs45_T0X36OZl13JNF4LqUgE_S4_mwhVA24XtV4Cx2ooA_YO9wfAG99r_rK7fFr7NbYW6zwy9C0eDeEsnKAKzfWT97ABTqzqu5g9hun6O12vVvdJ5vnu4fVcpNoxmifxBeBGqXKvExLkpsFN5kUqWAWBCPMaJlxmgIlTGkeEVnK0oCxyjCgEBlTdDXubYN_H6Dri6Mfgosni1QIwiXlGYus-cjaqxqKylnfB6WjG2gq7R3YKuJLSYkguYgCTdH1OKCD77oAtmijLip8FZQUP_IWf_Kyb5UhajU</recordid><startdate>20191101</startdate><enddate>20191101</enddate><creator>Xue, Peng</creator><creator>Liu, Zhiping</creator><creator>Lu, Li</creator><creator>Gao, Zhongxin</creator><creator>Meng, Xiaochao</creator><general>MDPI AG</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope></search><sort><creationdate>20191101</creationdate><title>Experimental Research on the Rotating Stall of a Pump Turbine in Pump Mode</title><author>Xue, Peng ; Liu, Zhiping ; Lu, Li ; Gao, Zhongxin ; Meng, Xiaochao</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c331t-111e1daab9b2b09d74d685253fe5303dc86412e103ac45308b8bdedfad3e1e303</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Computational fluid dynamics</topic><topic>Computer applications</topic><topic>Experimental research</topic><topic>Flow rates</topic><topic>Flow velocity</topic><topic>Fluid dynamics</topic><topic>Hydrodynamics</topic><topic>Lasers</topic><topic>Measurement techniques</topic><topic>Mechanical properties</topic><topic>Particle image velocimetry</topic><topic>Pump turbines</topic><topic>Research methodology</topic><topic>Reynolds number</topic><topic>Rotating stalls</topic><topic>Simulation</topic><topic>Testing</topic><topic>Turbines</topic><topic>Turbulence models</topic><topic>Unsteady flow</topic><topic>Working conditions</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Xue, Peng</creatorcontrib><creatorcontrib>Liu, Zhiping</creatorcontrib><creatorcontrib>Lu, Li</creatorcontrib><creatorcontrib>Gao, Zhongxin</creatorcontrib><creatorcontrib>Meng, Xiaochao</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><jtitle>Water (Basel)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Xue, Peng</au><au>Liu, Zhiping</au><au>Lu, Li</au><au>Gao, Zhongxin</au><au>Meng, Xiaochao</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Experimental Research on the Rotating Stall of a Pump Turbine in Pump Mode</atitle><jtitle>Water (Basel)</jtitle><date>2019-11-01</date><risdate>2019</risdate><volume>11</volume><issue>11</issue><spage>2426</spage><pages>2426-</pages><issn>2073-4441</issn><eissn>2073-4441</eissn><abstract>The rotating stall is an unstable flow phenomenon of pump turbines in pump mode, which is of increasing concern to scientists and engineers working on pump turbines. 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subjects Computational fluid dynamics
Computer applications
Experimental research
Flow rates
Flow velocity
Fluid dynamics
Hydrodynamics
Lasers
Measurement techniques
Mechanical properties
Particle image velocimetry
Pump turbines
Research methodology
Reynolds number
Rotating stalls
Simulation
Testing
Turbines
Turbulence models
Unsteady flow
Working conditions
title Experimental Research on the Rotating Stall of a Pump Turbine in Pump Mode
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