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Unapređenje metodologije merenja protoka pomoću ravnih elektromagnetnih senzora brzine

dc.creatorIvetić, Damjan
dc.creatorProdanović, Dušan
dc.creatorStojadinović, Luka
dc.creatorCvitkovac, Mile
dc.date.accessioned2019-04-19T14:27:40Z
dc.date.available2019-04-19T14:27:40Z
dc.date.issued2017
dc.identifier.issn0350-0519
dc.identifier.urihttps://grafar.grf.bg.ac.rs/handle/123456789/856
dc.description.abstractOne of the commonly used approaches, for the flow measurements in open chanel hydraulic systems, is to measure one depth and use the stable Q-H relationship to compute the flow rate. If this method is inappropriate, the velocity-area method has to be used: both area (depth) and mean velocity are measured in order to compute the flow rate. Although, it is reported that the velocity sensors operate with high uncertainty, the popularity of these methods stem from the fact that they can be applied in wide range of hydraulic conditions including the mixed flow conditions. Uncertainties are related both to the applied instruments and properties of the measurement site. While Doppler probes are preffered nowadays in the hydraulic systems, electromagnetic probes have certain adventages which are found to be useful in the methodology presented in this paper. Here, so called flat EM velocity probes are analyzed, which can be used instead of Doppler probes for the flow measurements. Due to the more rigourous operating principle, particular weighting functions can be derived in order to define contributions from different parts of the flow to the measured signal. Reduction of the uncertainty can be obtained through combination of the weighting functions with site-specific velocity fields computed with CFD simulations, In order to overcome the high uncertainty issue, additional site-specific calibration procedure for flat EM sensors is presented in this paper. Concept of its application in the engineering practice example are presented.en
dc.description.abstractNajčešće korišćen način merenja protoka u hidrotehničkim sistemima sa otvorenim tokom je preko merenja jedne dubine i preračunavanjem u protok korišćenjem Q-H krive. U uslovima kada nije moguće jednoznačno uspostaviti Q-H vezu, neophodno je koristiti metodu Brzina-Proticajni presek, gde se odvojeno mere (srednja) proticajna brzina i dubina. Iako su dosadašnja istraživanja pokazala da senzori brzine često rade sa visokom mernom neodređenošću, ovaj pristup je popularan zbog mogućnosti primene u širokom spektru hidrauličkih problema. Merna neodređenost u obračunatom protoku ima dvojaki karakter i rezultat je neodređenosti samog merenja brzine i dubine, kao i doprinosa usled nestandardnih uslova na mernom mestu. Iako se u hidrauličkim sistemima u poslednje vreme preferiraju ultrazvučne Dopler sonde, elekromagnetne (EM) sonde poseduju prednosti u realnim uslovima rada posebno u sistemima sa otpadnim vodama. U ovom radu, analizirane su ravne EM sonde za brzinu, koje se mogu koristiti umesto Dopler sondi za merenje protoka. Zbog jasnijeg principa rada EM sondi, moguće je definisati posebne težinske funkcije kojima se opisuje koliko koji deo polja brzina utiče na izlazni signal uređaja. Koristeći težinske funkcije u kombinaciji sa modeliranim realnim strujnim poljem, dobijenim pomoću prostornih numeričkih simulacija turbulentnog toka, moguće je smanjiti mernu neodređenost uređaja. Predložena metodologija je klasifikovana kao naknadna kalibracija EM uređaja prema uslovima na mernom mestu. Koncept njene primene je prikazan kroz praktičan primer.sr
dc.publisherJugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd
dc.relationinfo:eu-repo/grantAgreement/MESTD/Technological Development (TD or TR)/37010/RS//
dc.rightsopenAccess
dc.sourceVodoprivreda
dc.subjectflow measurementen
dc.subjectopen chanelen
dc.subjectCFDen
dc.subjectelectromagnetic probesen
dc.subjectmerenje protokasr
dc.subjectotvoreni tokovisr
dc.subjectCFDsr
dc.subjectelektromagnetne sondesr
dc.titleImprovement of the flow measuring methodology with the flat electromagnetic velocity probesen
dc.titleUnapređenje metodologije merenja protoka pomoću ravnih elektromagnetnih senzora brzinesr
dc.typearticle
dc.rights.licenseARR
dc.citation.epage102
dc.citation.issue1-3
dc.citation.other49(1-3): 93-102
dc.citation.rankM51
dc.citation.spage93
dc.citation.volume49
dc.identifier.fulltexthttps://grafar.grf.bg.ac.rs//bitstream/id/4231/854.pdf
dc.identifier.rcubconv_173
dc.type.versionpublishedVersion


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