Numeričko modeliranje procesa izgaranja u komori za izgaranje mlaznog motora korištenjem kemijske kinetike i pristupa tabeliranih podataka propagacije plamena

master's thesis

• Title (english): Numerical modelling of the combustion process in a jet engine combustion chamber using the chemical kinetics and flamelet generated manifold approaches
• Author: Ivan Pađen
• Mentor: Milan Vujanović (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2018-03-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Aviation, Rocket and Space Technology

Abstract

U ovome radu izvršena je analiza podobnosti metode pojednostavljenja kemijske kinetike za primjenu u mlaznim motorima. Reakcijski mehanizam aviogoriva JP-10 korišten je za simulacije izgaranja u bačvastoj komori za izgaranje. Proces izgaranja prvotno je modeliran koristeći pristup kemijske kinetike, u kojem je dodatni set transportnih jednadžbi riješen za svaku kemijsku vrstu. Zatim je korišten pristup tabličnih podataka propagacije plamena, preciznije AVL TABKIN model izgaranja temeljen na pristupu engleskog naziva Flamelet-Generated Manifold. Izgaranje je započeto modelom iskre koji uvodi energiju u određene točke u prostoru iznosa većeg od energije aktiviranja reakcije goriva. Ubrizgavanje je opisano Euler-Lagrangeovom metodom diskretnih čestica, te je korišten WAVE model raspršivanja kapljevine. Prikazani su dobiveni rezultati s naglaskom na kompromis između odstupanja rezultata i uštede u vremenu računanja. Računalne simulacije izvršene su u softverskom paketu AVL FIRE, dok su tablice propagacije plamena izrađene u alatu AVL TABKIN Table Generation Tool.

Abstract (english)

In this thesis a feasibility analysis of a chemistry simplification approach for jet engine applications was performed. A reaction mechanism of the JP-10 aviation fuel was used to conduct combustion simulations in a can-type combustion chamber. The combustion process was initially modeled using the general gas phase reactions approach, where an additional set of transport equations was solved for each chemical species involved. Afterwards, the tabulated chemistry approach was employed, specifically the Flamelet-Generated Manifold based AVL TABKIN combustion model. The ignition was initiated with the spark ignition model that introduces energy in certain points which is beyond the fuel activation energy. The fuel injection was described by the Euler-Lagrangian discrete particle approach, where the WAVE model was employed for liquid atomization. Obtained results were presented, with the emphasis on the compromise between result deviation and reduction in turnaround times. Simulations were performed with the computational dynamics software AVL FIRE and the chemistry tabulation was performed by AVL TABKIN Table Generation Tool.

• Keywords: CFD; jet engine; combustion; chemical kinetics; chemistry tabulation; tabkin
• Keywords (english): RDF; mlazni motor; izgaranje; kemijska kinetika; tablični pristup; tabkin
• Language: english
• URN:NBN: urn:nbn:hr:235:615905
• 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 09:43:26