Projekt sustava za mjerenja protočne količine oštrom prigušnicom

master's thesis

• Title (english): Design of fluid flow measurement system with orifice plate
• Author: Luka Vukmirović
• Mentor: Lovorka Grgec Bermanec (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2017-12-08, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

Glavni cilj ovog diplomskog rada je dizajniranje, sastavljanje i karakterizacija mjerne linije za mjerenje protoka zraka oštrom prigušnicom nazivnog promjera DN25. Nakon odabira osnovnih komponenti i sastavljanja mjerne linije provedena su višestruka mjerenja, te proračun protoka i mjerne nesigurnosti za svaku točku. Strujanje zraka je ostvarivano na 2 načina, ventilatorom i sušilom za kosu.

Prvo je napravljen teorijski dio zadatka gdje je obrađena povijest mjerenja protoka, metode mjerenja protoka i terminologija vezana za mjerenja protoka. Nakon toga je na red došla konstrukcija mjerne linije koja je prilagođena oštroj prigušnici, gdje je uz simulaciju na računalu i primjenom teorije kupili cijev i ventilator koji su nam bili potrebni. Sastavljanje linije se odvijalo u Laboratoriju za procesna mjerenja,a tamo su također rađena i mjerenja. Mjerenja su napravljena tako da su odabrane nominalne točke za pad tlaka, sedam za ventilator i šest za sušilo za kosu, te je cilj bio izračunati protok za svaku točku. Računanje protoka je bilo napravljeno prema karakterizaciji mjerne linije koja je bila napravljena nakon sastavljanja i prije mjerenja u skladu sa normom ISO 5167. Nakon mjerenja i proračuna protoka je određena i mjerna nesigurnost, kao i analiza rezultata.

Sva mjerenja su rađena u Laboratoriju za procesna mjerenja na Fakultetu strojarstva i brodogradnje, također većina opreme koja je korištena za postavljanje mjerne linije je iz LPM-a, osim ventilatora i cijevi koji su kupljeni u svrhu konstrukcije i sastavljanja mjerne linije za mjerenje protoka.

Abstract (english)

Main objective of this work is design, assembly and characterization of measuring line for flow measurement of air with orifice plate that has nominal diameter DN25. After selecting required components and assembling the measuring line, multiple measurements were performed. The flow and the measurement uncertainty for each point were calculated. There were two ways to establish the air flow, by small cooling fan and hairdryer.

A theoretical part of the task was made first, where the history of flow measurement, flow metering and terminology related to flow measurements were done. After that, measurement line was constructed to fit the orifice plate that we were using, with the computer simulation and aplication of the theory we bought the tube and fan we needed. The line was assembled in the Laboratory for Process Measurements, and measurements were also made there. Measurements were made to select the nominal pressure drops, seven for the fan and six for the hair dryer, and the goal was to calculate the flow for each point. Flow calculation was made according to the characterization of the metering line that was made after assembly and before measurement according to ISO 5167. After measurement and flow calculation, measurement uncertainty as well as analysis of results were determined.

All measurements were made in the Laboratory for Process Measurement at the Faculty of Mechanical Engineering and Naval Architecture, and most of the equipment used for setting the measurement line was from the LPM, except the fans and pipes that were purchased for construction of measurement line.

• Keywords: oštra prigušnica; prigušnica; mjerenje protoka; projekt sustava
• Keywords (english): orifice plate; orifice; plate; flow measurement; measurement
• Language: croatian
• URN:NBN: urn:nbn:hr:235:035626
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-22 20:49:29