Trodimenzionalna numerička simulacija procesa izgaranja u komori izgaranja mlaznog motora

master's thesis

• Title (english): Three-dimensional numerical simulation of combustion in a jet engine combustion chamber
• Author: Fran Delić
• Mentor: Hrvoje Jasak (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-03-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Aviation, Rocket and Space Technology

Abstract

U radu su opisane jednadžbe i aproksimacije koje se koriste u modeliranju procesa izgaranja. Za validaciju koristenog modela (partially stirred reactor), rezultati su uspoređeni s eksperimentalnim podacima mjerenim za Sandia Flame D plamen. Također je istražen utjecaj kemijskih reakcija na glavne karakteristike strujanja. Budući da su za simulacije korišteni reakcijski mehanizmi s različitim brojem kemijskih reakcija, u sklopu rada je implementiran prošireni Zeldovichev mehanizam za proračun koncentracije NO. Validirani modeli korišteni su za simulaciju pojava u Rolls Royce Tay komori izgaranja pri različitim postavkama u uvjetima polijetanja, te su rezultati uspoređeni s eksperimentalnim podacima. Emisije NOx spojeva uspoređene su s dostupnim podacima Organizacije međunarodnog civilnog zrakoplovstva.

Abstract (english)

The objective of this thesis is to simulate the combustion process inside a jet engine combustion chamber using Computational Fluid Dynamics. The mathematical foundations and main issues of combustion modelling are presented. The partially stirred reactor (PaSR) combustion model, coupled with the k-ε turbulence model, is validated on the Sandia Flame D test case. The influence of three-dimensional effects and reaction mechanism complexity on flow characteristics is
examined. The extended Zeldovich mechanism is used to calculate NO emissions, comparing results computed using reaction mechanisms of increasing complexity to experimental data.
Numerical combustion simulations are performed on the Rolls Royce Tay geometry, for two flow configurations at take-off conditions. Simulation results are compared to available experimental data. The extended Zeldovich mechanism is used to model NOx emissions, which are compared to International Civil Aviation Organization emissions data.

• Keywords: CFD; OpenFOAM; foam-extend; PaSR; reactingFoam; extended Zeldovich; Sandia Flame D; Rolls Royce Tay
• Keywords (english): CFD; OpenFOAM; foam-extend; PaSR; reactingFoam; extended Zeldovich; Sandia Flame D; Rolls Royce Tay.
• Language: english
• URN:NBN: urn:nbn:hr:235:409395
• Study programme: Title: Aeronautical Studies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka zrakoplovnog inženjerstva (magistar/magistra inženjer/inženjerka zrakoplovnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-28 09:50:10