Proračun aksijalnog ventilatora i određivanje radne karakteristike pomoću CFD analize

master's thesis

• Title (english): Design of an axial fan and CFD analysis of the fan performance characteristic
• Author: Marija Semren
• Mentor: Željko Tuković (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-01-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

Zadatak ovog diplomskog rada bio je konstruirati statorske i rotorske lopatice aksijalnog
ventilatora te izraditi CAD model rešetke rotora i statora za CFD simulacije strujanja kroz
ventilator.
Oblikovanje profila rotorskih i statorskih lopatica aksijalnog ventilatora izvedeno je koristeći
metodologiju temeljenu na numerički određenim aerodinamičkim karakteristikama, uz
primjenu uvjeta slobodnog vrtloga. Oblik lopatica dobiven numeričkim proračunom uspoređen
je s oblikom lopatica dobivenim analitičkim proračunom. Provedeno je šest simulacija
računalne dinamike fluida s različitim protocima i konstantnom brzinom vrtnje rotora u
računalnom programu OpenFOAM® te su na temelju simulacija određeni prorasti totalnog
tlaka i promjene statičkog tlaka i brzine uzvodno i nizvodno od ventilatora. Usporedbom
izračunate snage konstruiranog ventilatora s komercijalnim ventilatorom sličnih dimenzija,
dobivena je učinkovitost.
Dodatno, provedene su dvije dodatne simulacije izvedbi sa usmjeravajućim statorskim
lopaticama ispred i iza rotora kako bi se mogla usporediti slika strujanja i usporediti
učinkovitost izvedbi.
Na temelju podataka dobivenih analizom rezultata numeričkih simulacija za različite protoke,
izračunate su radne karakteristike te je konstruirana krivulja učinkovitosti ventilatora.

Abstract (english)

The task of this master's thesis was to construct the stator and rotor blades of an axial fan and
to create a CAD model of the rotor and stator grid for CFD simulations of flow through the fan.
The shaping of the profiles of the rotor and stator blades of the axial fan was carried out using
a methodology based on numerically determined aerodynamic characteristics, with the
application of free vortex conditions. The blade shapes obtained through numerical calculations
were compared with those obtained through analytical calculations. Six computational fluid
dynamics simulations were conducted with different flow rates and a constant rotor rotation
speed using the OpenFOAM® software. Based on these simulations, the increases in total
pressure and changes in static pressure and velocity upstream and downstream of the fan were
determined. Efficiency was obtained by comparing the calculated power of the constructed fan
with that of a commercially available fan of similar dimensions.
Additionally, two extra simulations were performed with guiding stator blades in front of and
behind the rotor to compare the flow patterns and assess the efficiency of these configurations.
Based on the data obtained from the analysis of results of numerical simulations for various
flow rates, the operating characteristics were calculated, and the efficiency curve of the fan was
constructed.

• Keywords: aksijalni ventilator; radna karakteristika ventilatora; simulacija strujanja u ventilatoru; OpenFOAM
• Keywords (english): axial fan; fan operating characteristic; simulation of airflow through a fan; OpenFOAM
• Language: croatian
• URN:NBN: urn:nbn:hr:235:369100
• 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: 2024-01-18 17:32:06