Centrifugalni ventilator za hlađenje visokobrzinskog mikrogeneratora

master's thesis

• Title (english): Centrifugal fan for highspeed microgenerator cooling
• Author: Loren Frančin
• Mentor: Željko Tuković (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-10, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U ovom radu projektiran je centrifugalni ventilator za hlađenje rotora visokobrzinskog kompaktnog električnog generatora. Analitički hidrodinamički proračun izvršen je iterativno. Za provedbu numeričkog proračuna korišten je programski paket Ansys Fluent i metoda konačnih volumena. Rotacijske pojave modelirane su pomoću rotirajućeg koordinatnog sustava. Utvrđeno je da zadani prirast statičkog tlaka nije bio dovoljan za potrebni protok u rashladnom sustavu električnog generatora. Izvršen je proračun dva radna kola. Prva inačica projektirana je pod pretpostavkom radijalnog ulaza i sa zadanim prirastom tlaka. Druga inačica u obzir uzima tangencijalnu komponentnu apsolutne brzine na ulazu te korigirani prirast statičkog tlaka. Numeričkim putem potvrđene su analitički određene karkteristike te je provedena analiza ovisnosti rezultata o rezoluciji prostorne diskretizacije. Za drugu inačicu centrifugalnog ventilatora određena je karakteristična krivulja.

Abstract (english)

In this thesis, a centrifugal fan has been developed for the purpose of cooling a rotor of a very-high-speed compact electric generator. The hydrodynamic analysis was performed iteratively. Numerical analysis was performed using Ansys Fluent and the finite volume method. Rotation effects were modelled using the multiple reference frame method. It was determined that the given required increase of static pressure is inadequate with regards to the required volume flow in the closed-loop cooling system of an electric generator. Two impellers were designed. The first version was developed under the assumption of radial entry and with the given required increase of static pressure. The second version takes into account the non-zero tangential component of absolute velocity at the entrance of the impeller and is developed according to an updated required increase of static pressure. Hydrodynamically determined characteristics were numerically verified and a mesh-dependency analysis was made. The characteristic fan curve was determined for the second version of the centrifugal fan.

• Keywords: Ansys Fluent; ventilator; električni generator; rotor; hlađenje; metoda konačnih volumena
• Keywords (english): Ansys Fluent; fan; electric generator; rotor; cooling; finite volume method
• Language: croatian
• URN:NBN: urn:nbn:hr:235:576017
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering, Mechanics and Robotics, Autonomous Systems, Mechatronics and Robotics; Course: Engineering Modelling and Computer Simulation; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva (sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-02-05 09:47:59