Numeričko modeliranje prijenosa topline zračenjem u motoru za teške radne uvjete

undergraduate thesis

• Title (english): Numerical modelling of radiative heat transfer in heavy-duty engine
• Author: Tomislav Mučalo
• Mentor: Milan Vujanović (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-03-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

Računalna dinamika fluida (RDF) zajedno s eksperimentalnim istraživanjima se najčešće koriste u svrhu razvoja motora s kompresijskim upaljivanjem. Nedavna istraživanja pokazuju da je detaljno modeliranje prijenosa topline zračenjem u motorima s unutrašnjim izgaranjem postalo neophodno kako bi se povećala točnost sveukupnog prijenosa topline, karakteristika izgaranja i predviđanja formacija onečišćujućih tvari. Za proračun prijenosa topline zračenjem u ovom radu je korištena metoda diskretnih ordinata u kombinaciji s metodom konačnih volumena u sklopu AVL FIRETM CFD softvera. Apsorpcija i emisija energije zračenja su opisane metodom težinske sume sivih plinova, koja ukupan koeficijent apsorpcije računa pomoću korelacija apsorpcije za ugljikov dioksid, vodenu paru i čađu. Model prijenosa topline zračenjem je prvo testiran za slučaj s analitičkim rješenjem te ponovno validiran u odnosu na rezultate srednjeg tlaka unutar cilindra motora. Konačno, rezultati simulacija za srednji tlak, temperaturu i udjele onečišćujućih tvari su uspoređeni.

Abstract (english)

The Computer Fluid Dynamics (CFD) combined with experimental research is commonly utilised to develop compression ignition engines. Recent studies showed that a detailed modelling of radiative heat transfer in internal combustion engines has become necessary to increase the accuracy of overall heat transfer, combustion characteristics, and formation predictions of pollutants. For radiative heat transport computing in this thesis, the method of discrete ordinates employing the finite volume method in AVL FIRETM CFD software is used. The absorptivity and emissivity are described with Weighted Sum of Gray Gases Method (WSGGM), which calculates the overall absorption coefficient using carbon dioxide, water vapour and soot absorption coefficient correlations. The radiative heat transfer model is first validated on a case with the analytic solution and secondly validated against mean pressure results inside an engine cylinder. Ultimately, simulation results for mean pressure, temperature, and pollutant ratios are compared.

• Keywords: RDF; motori s unutrašnjim izgaranjem; prijenos topline zračenjem; motori za teške radne uvjete
• Keywords (english): CFD; Internal combustion engines; radiative heat transport; heavy duty engines
• Language: croatian
• URN:NBN: urn:nbn:hr:235:545164
• Project: Number: KK.01.1.1.04.0070; Title: Razvoj sustava za ispitivanje višefaznih strujanja i izgaranja s ciljem povećanja istraživačkih aktivnosti znanstvenog i poslovnog sektora; Acronym: RESIN; Leader: Milan Vujanović; Jurisdiction: Croatia; Funder: MRRFEU; Funding stream: Nema
• 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; Course: Process and Energy 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 resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-02-24 09:28:52