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Title:Reversible pump-turbines - a study of pumping mode off-design conditions
Authors:ID Ješe, Uroš (Author)
ID Skoták, Aleš (Author)
Files:.pdf Reversible_pump-turbines_Novosel_2020.pdf (2,46 MB)
MD5: 31C0533F514DF4BE19A8C2122BE611CF
 
URL https://www.fe.um.si/e-jet/40-2020-1/2336-september-2020.html
 
Language:English
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FE - Faculty of Energy Technology
Abstract:The role of pumped storage power plants (PSP) in electrical grid systems has been changing in recent years. Demands for switching from pumping to generating mode are becoming increasingly frequent. Moreover, the operating ranges of the reversible pump-turbines used in PSP systems are becoming wider in order to use the PSP as a regulator and a stabilizer of the electrical grid. The primary challenges in the development of pump-turbines are the hydraulic instabilities that occur in pumping and generating modes. The present paper focuses on partial load pumping mode instabilities, such as cavitation and rotating stall. Modern tools, such as CFD, are used for the analysis of the phenomena along with conventional experimental approaches. Rotating stall has been investigated in hydraulic laboratory experimentally and reproduced numerically using commercial CFD code. Three rotating stall cells with a rotational frequency of 2.5% of nominal pump-turbine frequency have been identified. Cavitating vortices related to rotating stall were found in the guide vanes region. Both phenomena indicate highly unstable and potentially dangerous operating conditions that need to be investigated in detail. Understanding the causes for the instabilities will lead to an improved pump-turbine design that will enable safer, more flexible and more reliable operating with fewer unwanted instabilities.
Keywords:pump-turbine, rotating stall, cavitation, Pumping mode instabilities
Publication status:Published
Publication version:Version of Record
Publication date:01.09.2020
Publisher:Fakulteta za energetiko Univerze v Mariboru
Year of publishing:2020
Number of pages:Str. 37-44
Numbering:Letn. 13, Št. 2
PID:20.500.12556/DKUM-86445 New window
UDC:621.311.21:621.224
ISSN on article:1855-5748
COBISS.SI-ID:32161795 New window
Publication date in DKUM:01.12.2023
Views:284
Downloads:3
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Categories:Misc.
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Record is a part of a journal

Title:Journal of energy technology
Publisher:Fakulteta za energetiko
ISSN:1855-5748
COBISS.SI-ID:243311360 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:L2-1825
Name:Modeliranje zračnih mehurjev ujetih v hidravličnih cevnih sistemih

Secondary language

Language:Slovenian
Title:Reverzibilne turbine-črpalke - analiza nestacionarnih pojavov v črpalnem režimu obratovanja
Abstract:Vloga črpalnih hidroelektrarn v električnih omrežjih se v zadnjih letih spreminja. Zahteve po prehodu s črpalnega v turbinski režim in nazaj postajajo vse pogostejše. Območja obratovanja reverzibilnih črpalk-turbin se ob tem širijo, saj se črpalne hidroelektrarne uporabljajo kot regulator in stabilizator električnega omrežja. Glavni izzivi pri razvoju reverzibilnih črpalk-turbin so hidravlične nestabilnosti, ki se pojavijo v črpalnem in turbinskem režimu. Članek se osredotoča na nestabilnosti v črpanem režimu pri delnih obremenitvah, kot sta kavitacija in vrteče zastojne celice. Sodobna orodja, kot računska dinamika tekočin (CFD), se uporabljajo za analizo pojavov kot dodatek klasičnim eksperimentalnim pristopom. Vrteče zastojne celice so bile eksperimentalno raziskane v hidravličnem laboratoriju ter numerično reproducirane s komercialnim CFD programom. Odkrite so bile tri zastojne celice s frekvenco vrtenja 2.5 % nazivne frekvence črpalke-turbine. V območju vodilnih lopat so bili opaženi kavitacijski vrtinci povezani z zastojnimi celicami. Oba pojava kažeta na zelo nestabilno in potencialno nevarno obratovanje, ki ga je potrebno podrobno raziskati. Razumevanje vzrokov za nestabilnosti bo pripeljalo do izboljšane zasnove črpalke-turbine, ki bo omogočila varnejše, prožnejše in zanesljivejše obratovanje z manj neželenimi nestabilnostmi.
Keywords:reverzibilne turbine, črpalke, kavitacija, hidroelektrarne


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This document is a part of these collections:
  1. Journal of energy technology

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