Inter-Blade Vortex and Vortex Rope Characteristics of a Pump-Turbine in Turbine Mode under Low Flow Rate Conditions
Pump-turbines are often used to provide a stable power supply with a constant frequency in response to intermittent renewable energy resources. However, existing pumped-storage power stations often operate under off-design conditions because of the increasing amounts of inconsistent renewable resour...
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| Veröffentlicht in: | Water (Basel) 2019-12, Vol.11 (12), p.2554 |
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| creator | Kim, Seung-Jun Suh, Jun-Won Choi, Young-Seok Park, Jungwan Park, No-Hyun Kim, Jin-Hyuk |
| description | Pump-turbines are often used to provide a stable power supply with a constant frequency in response to intermittent renewable energy resources. However, existing pumped-storage power stations often operate under off-design conditions because of the increasing amounts of inconsistent renewable resources that have been added to the grid. Under off-design low flow rate conditions, inter-blade vortex and vortex rope phenomena usually develop in the runner and draft tube passages, respectively, in turbine mode. These vortices cause complicated flow patterns and pressure fluctuations that destabilize the operation of the pump-turbine system. Therefore, this study investigates the influence of correlation between the inter-blade vortex and vortex rope phenomena under low flow rate conditions. Three-dimensional steady- and unsteady-state Reynolds-averaged Navier–Stokes equations were calculated with a two-phase flow analysis using a shear stress transport as the turbulence model. The inter-blade vortices in the runner passages were captured well at the low flow rate conditions, and the vortex rope was found to develop within a specific range of low flow rates. These vortex regions showed a blockage effect and complicated flow characteristics with backflow in the passages. Moreover, higher unsteady pressure characteristics occurred at locations where the vortices were especially pronounced. |
| doi_str_mv | 10.3390/w11122554 |
| format | Article |
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However, existing pumped-storage power stations often operate under off-design conditions because of the increasing amounts of inconsistent renewable resources that have been added to the grid. Under off-design low flow rate conditions, inter-blade vortex and vortex rope phenomena usually develop in the runner and draft tube passages, respectively, in turbine mode. These vortices cause complicated flow patterns and pressure fluctuations that destabilize the operation of the pump-turbine system. Therefore, this study investigates the influence of correlation between the inter-blade vortex and vortex rope phenomena under low flow rate conditions. Three-dimensional steady- and unsteady-state Reynolds-averaged Navier–Stokes equations were calculated with a two-phase flow analysis using a shear stress transport as the turbulence model. The inter-blade vortices in the runner passages were captured well at the low flow rate conditions, and the vortex rope was found to develop within a specific range of low flow rates. These vortex regions showed a blockage effect and complicated flow characteristics with backflow in the passages. Moreover, higher unsteady pressure characteristics occurred at locations where the vortices were especially pronounced.</description><identifier>ISSN: 2073-4441</identifier><identifier>EISSN: 2073-4441</identifier><identifier>DOI: 10.3390/w11122554</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Aerodynamics ; Alternative energy sources ; Analysis ; Cavitation ; Computational fluid dynamics ; Computer software industry ; Draft tubes ; Energy resources ; Energy sources ; Finite volume method ; Flow characteristics ; Flow distribution ; Flow rates ; Flow velocity ; Fluid flow ; Investigations ; Low flow ; Multiphase flow ; Numerical analysis ; Power plants ; Power supply ; Pumped storage ; Renewable resources ; Rope ; Shear stress ; Sustainable yield ; Three dimensional flow ; Turbines ; Turbulence models ; Turbulent flow ; Two phase flow ; Visualization ; Vortices</subject><ispartof>Water (Basel), 2019-12, Vol.11 (12), p.2554</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/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c331t-dafc5440ec9c2252fe4f1ff8088bef8d5a2bbcf38beb432f4e37a1a88339c1443</citedby><cites>FETCH-LOGICAL-c331t-dafc5440ec9c2252fe4f1ff8088bef8d5a2bbcf38beb432f4e37a1a88339c1443</cites><orcidid>0000-0001-7251-7154</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,777,781,27905,27906</link.rule.ids></links><search><creatorcontrib>Kim, Seung-Jun</creatorcontrib><creatorcontrib>Suh, Jun-Won</creatorcontrib><creatorcontrib>Choi, Young-Seok</creatorcontrib><creatorcontrib>Park, Jungwan</creatorcontrib><creatorcontrib>Park, No-Hyun</creatorcontrib><creatorcontrib>Kim, Jin-Hyuk</creatorcontrib><title>Inter-Blade Vortex and Vortex Rope Characteristics of a Pump-Turbine in Turbine Mode under Low Flow Rate Conditions</title><title>Water (Basel)</title><description>Pump-turbines are often used to provide a stable power supply with a constant frequency in response to intermittent renewable energy resources. However, existing pumped-storage power stations often operate under off-design conditions because of the increasing amounts of inconsistent renewable resources that have been added to the grid. Under off-design low flow rate conditions, inter-blade vortex and vortex rope phenomena usually develop in the runner and draft tube passages, respectively, in turbine mode. These vortices cause complicated flow patterns and pressure fluctuations that destabilize the operation of the pump-turbine system. Therefore, this study investigates the influence of correlation between the inter-blade vortex and vortex rope phenomena under low flow rate conditions. Three-dimensional steady- and unsteady-state Reynolds-averaged Navier–Stokes equations were calculated with a two-phase flow analysis using a shear stress transport as the turbulence model. The inter-blade vortices in the runner passages were captured well at the low flow rate conditions, and the vortex rope was found to develop within a specific range of low flow rates. These vortex regions showed a blockage effect and complicated flow characteristics with backflow in the passages. Moreover, higher unsteady pressure characteristics occurred at locations where the vortices were especially pronounced.</description><subject>Aerodynamics</subject><subject>Alternative energy sources</subject><subject>Analysis</subject><subject>Cavitation</subject><subject>Computational fluid dynamics</subject><subject>Computer software industry</subject><subject>Draft tubes</subject><subject>Energy resources</subject><subject>Energy sources</subject><subject>Finite volume method</subject><subject>Flow characteristics</subject><subject>Flow distribution</subject><subject>Flow rates</subject><subject>Flow velocity</subject><subject>Fluid flow</subject><subject>Investigations</subject><subject>Low flow</subject><subject>Multiphase flow</subject><subject>Numerical analysis</subject><subject>Power plants</subject><subject>Power supply</subject><subject>Pumped storage</subject><subject>Renewable resources</subject><subject>Rope</subject><subject>Shear stress</subject><subject>Sustainable yield</subject><subject>Three dimensional flow</subject><subject>Turbines</subject><subject>Turbulence models</subject><subject>Turbulent flow</subject><subject>Two phase flow</subject><subject>Visualization</subject><subject>Vortices</subject><issn>2073-4441</issn><issn>2073-4441</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpNUU1LAzEQDaJgqT34DwKePGzNJ5s91mK1UFFK9bpks4mmbJM1yVL990ZqxQnMvIT3XpgZAC4xmlJaoZs9xpgQztkJGBFU0oIxhk__4XMwiXGLcrBKCI5GIC5d0qG47WSr4asPSX9C6dojXPtew_m7DFJlmo3Jqgi9gRI-D7u-2AyhsU5D6-ARPvpsNLhWB7jye7joclrLlF28a22y3sULcGZkF_Xkt47By-JuM38oVk_3y_lsVShKcSpaaRRnDGlVqdwVMZoZbIxAQjTaiJZL0jTK0HxrGCWGaVpKLIXIs1CYMToGVwffPviPQcdUb_0QXP6yzkNCnFBS8syaHlhvstO1dcan3G0-rd5Z5Z02Nr_PygqTijJeZsH1QaCCjzFoU_fB7mT4qjGqf_ZQ_-2BfgNIYXoQ</recordid><startdate>20191201</startdate><enddate>20191201</enddate><creator>Kim, Seung-Jun</creator><creator>Suh, Jun-Won</creator><creator>Choi, Young-Seok</creator><creator>Park, Jungwan</creator><creator>Park, No-Hyun</creator><creator>Kim, Jin-Hyuk</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><orcidid>https://orcid.org/0000-0001-7251-7154</orcidid></search><sort><creationdate>20191201</creationdate><title>Inter-Blade Vortex and Vortex Rope Characteristics of a Pump-Turbine in Turbine Mode under Low Flow Rate Conditions</title><author>Kim, Seung-Jun ; Suh, Jun-Won ; Choi, Young-Seok ; Park, Jungwan ; Park, No-Hyun ; Kim, Jin-Hyuk</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c331t-dafc5440ec9c2252fe4f1ff8088bef8d5a2bbcf38beb432f4e37a1a88339c1443</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Aerodynamics</topic><topic>Alternative energy sources</topic><topic>Analysis</topic><topic>Cavitation</topic><topic>Computational fluid dynamics</topic><topic>Computer software industry</topic><topic>Draft tubes</topic><topic>Energy resources</topic><topic>Energy sources</topic><topic>Finite volume method</topic><topic>Flow characteristics</topic><topic>Flow distribution</topic><topic>Flow rates</topic><topic>Flow velocity</topic><topic>Fluid flow</topic><topic>Investigations</topic><topic>Low flow</topic><topic>Multiphase flow</topic><topic>Numerical analysis</topic><topic>Power plants</topic><topic>Power supply</topic><topic>Pumped storage</topic><topic>Renewable resources</topic><topic>Rope</topic><topic>Shear stress</topic><topic>Sustainable yield</topic><topic>Three dimensional flow</topic><topic>Turbines</topic><topic>Turbulence models</topic><topic>Turbulent flow</topic><topic>Two phase flow</topic><topic>Visualization</topic><topic>Vortices</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kim, Seung-Jun</creatorcontrib><creatorcontrib>Suh, Jun-Won</creatorcontrib><creatorcontrib>Choi, Young-Seok</creatorcontrib><creatorcontrib>Park, Jungwan</creatorcontrib><creatorcontrib>Park, No-Hyun</creatorcontrib><creatorcontrib>Kim, Jin-Hyuk</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>Kim, Seung-Jun</au><au>Suh, Jun-Won</au><au>Choi, Young-Seok</au><au>Park, Jungwan</au><au>Park, No-Hyun</au><au>Kim, Jin-Hyuk</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Inter-Blade Vortex and Vortex Rope Characteristics of a Pump-Turbine in Turbine Mode under Low Flow Rate Conditions</atitle><jtitle>Water (Basel)</jtitle><date>2019-12-01</date><risdate>2019</risdate><volume>11</volume><issue>12</issue><spage>2554</spage><pages>2554-</pages><issn>2073-4441</issn><eissn>2073-4441</eissn><abstract>Pump-turbines are often used to provide a stable power supply with a constant frequency in response to intermittent renewable energy resources. However, existing pumped-storage power stations often operate under off-design conditions because of the increasing amounts of inconsistent renewable resources that have been added to the grid. Under off-design low flow rate conditions, inter-blade vortex and vortex rope phenomena usually develop in the runner and draft tube passages, respectively, in turbine mode. These vortices cause complicated flow patterns and pressure fluctuations that destabilize the operation of the pump-turbine system. Therefore, this study investigates the influence of correlation between the inter-blade vortex and vortex rope phenomena under low flow rate conditions. Three-dimensional steady- and unsteady-state Reynolds-averaged Navier–Stokes equations were calculated with a two-phase flow analysis using a shear stress transport as the turbulence model. The inter-blade vortices in the runner passages were captured well at the low flow rate conditions, and the vortex rope was found to develop within a specific range of low flow rates. These vortex regions showed a blockage effect and complicated flow characteristics with backflow in the passages. Moreover, higher unsteady pressure characteristics occurred at locations where the vortices were especially pronounced.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/w11122554</doi><orcidid>https://orcid.org/0000-0001-7251-7154</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Aerodynamics Alternative energy sources Analysis Cavitation Computational fluid dynamics Computer software industry Draft tubes Energy resources Energy sources Finite volume method Flow characteristics Flow distribution Flow rates Flow velocity Fluid flow Investigations Low flow Multiphase flow Numerical analysis Power plants Power supply Pumped storage Renewable resources Rope Shear stress Sustainable yield Three dimensional flow Turbines Turbulence models Turbulent flow Two phase flow Visualization Vortices |
| title | Inter-Blade Vortex and Vortex Rope Characteristics of a Pump-Turbine in Turbine Mode under Low Flow Rate Conditions |
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