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undergraduate thesis
Mjerenje protoka u dovodnom hidrauličkom sustavu HE ultrazvučnim mjerilom protoka
2022. urn:nbn:hr:190:571322
Mrle, Zvonimir
University of Rijeka
Faculty of Engineering
Department of Fluid Mechanics and Computational Engineering
Section of Fluid Mechanics and Hydraulic Machines

Cite this document

Mrle, Z. (2022). Mjerenje protoka u dovodnom hidrauličkom sustavu HE ultrazvučnim mjerilom protoka (Undergraduate thesis). Rijeka: University of Rijeka, Faculty of Engineering. Retrieved from https://urn.nsk.hr/urn:nbn:hr:190:571322

Mrle, Zvonimir. "Mjerenje protoka u dovodnom hidrauličkom sustavu HE ultrazvučnim mjerilom protoka." Undergraduate thesis, University of Rijeka, Faculty of Engineering, 2022. https://urn.nsk.hr/urn:nbn:hr:190:571322

Mrle, Zvonimir. "Mjerenje protoka u dovodnom hidrauličkom sustavu HE ultrazvučnim mjerilom protoka." Undergraduate thesis, University of Rijeka, Faculty of Engineering, 2022. https://urn.nsk.hr/urn:nbn:hr:190:571322

Mrle, Z. (2022). 'Mjerenje protoka u dovodnom hidrauličkom sustavu HE ultrazvučnim mjerilom protoka', Undergraduate thesis, University of Rijeka, Faculty of Engineering, accessed 13 March 2025, https://urn.nsk.hr/urn:nbn:hr:190:571322

Mrle Z. Mjerenje protoka u dovodnom hidrauličkom sustavu HE ultrazvučnim mjerilom protoka [Undergraduate thesis]. Rijeka: University of Rijeka, Faculty of Engineering; 2022 [cited 2025 March 13] Available at: https://urn.nsk.hr/urn:nbn:hr:190:571322

Z. Mrle, "Mjerenje protoka u dovodnom hidrauličkom sustavu HE ultrazvučnim mjerilom protoka", Undergraduate thesis, University of Rijeka, Faculty of Engineering, Rijeka, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:190:571322

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Metadata
TitleMjerenje protoka u dovodnom hidrauličkom sustavu HE ultrazvučnim mjerilom protoka
Title (english)Flow rate mesuremant in HPP hydraulic intake system with ultrasonic flow meter
AuthorZvonimir Mrle
MentorZoran Čarija (mentor)
Committee memberKristian Lenić (predsjednik povjerenstva)
Committee memberZoran Čarija (član povjerenstva)
GranterUniversity of Rijeka
Faculty of Engineering
(Department of Fluid Mechanics and Computational Engineering)
(Section of Fluid Mechanics and Hydraulic Machines)
Rijeka
Defense date and country2022-09-20, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Basic Technical Sciences
Fluid Mechanics
Abstract
Protok je vrlo važan pojam u ljudskome životu, a to pogotovo u svakom industrijskom procesu. Stoga se od rane prošlosti pa sve do danas istražuju razni načini kako što efikasnije izmjeriti protok. Jedan od novijih i modernijih načina mjerenja protoka je ultrazvučna metoda. Ultrazvučno mjerenje protoka je način mjerenja protoka pomoću ultrazvučnih valova koji se šalju i primaju iz senzora ultrazvučnih mjerača. Ovi mjerači nemaju pokretnih dijelova te je njihova instalacija prilično jednostavna,... More što ih zapravo i čini popularnima, no pri radu s njima treba biti izrazito oprezan jer i najmanja greška dovodi do odstupanja u rezultatima. Postoje dvije glavne metode na kojima ultrazvučni mjerači temelje svoj rad, a ujedno se po tome i razlikuju, a to su Dopplerova metoda i metoda zasnovana na vremenu prolaza. Senzori ultrazvučnih mjerača mogu se montirati s vanjske strane cijevi („Clamp on“) te s unutarnje strane cijevi („Inline“). Upravo se pomoću ultrazvučnog mjerača, koji radi na principu vremena prolaza, izvršilo mjerenje protoka vode u tlačnom cjevovodu HE Rijeka. Mjerenje se vršilo od trenutka puštanja turbine u rad pa sve do njena zaustavljanja. Pri mjerenju su praćena tri karakteristična područja koja su prisutna u radu svake hidroelektrane, a to su faza pokretanja, ustaljena rada, te faza zaustavljanja. Nakon analize rezultata i konstrukcije grafova došlo se do spoznaje kako izmjereni podaci imaju određene oscilacije i odstupanja od računski izračunatog protoka, a što je vjerojatno posljedica greške prilikom montaže. Less
Abstract (english)
The flow is of great importance for human life in general, and for any industrial process in particular. That is why from early history up to the present day, various methods have been examined to measure the flow as accurately and as efficiently as possible. One of the more recent and modern methods is the ultrasonic method. Ultrasonic flow measurement is performed by means of ultrasonic waves which are transmitted to and from ultrasonic meter sensors. Since ultrasonic meters have no movable... More parts, they are very easy to install and therefore widely used. However, they should be operated with great care because even a slightest error may cause deviations in their readings. Operations of ultrasonic meters are based on the two main methods: the Doppler method or the transit time method. The meters are also distinguished according to these methods. The ultrasonic meter sensors can be mounted on the outside of a pipe (“clamp-on”) or on its inside (“inline”). The water flow in the penstock of the Rijeka hydroelectric power plant (HE Rijeka) was measured by an ultrasonic meter using the transit time method. The metering was performed from the moment the turbine was put into operation until its shutdown. During the metering, three characteristic stages of the hydroelectric power plant’s operation were monitored: the starting stage, the steady-state operation stage and the shutdown stage. Upon the analysis of the readings and the design of the graphs, the conclusion was reached that the reading data showed some oscillations and deviations from the computer-calculated flow. This was probably due to an error during the installation. Less
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:190:571322
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence Attribution 4.0 International (CC BY 4.0) icon
Created on2022-09-23 07:17:23
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