Numeričko modeliranje procesa ubrizgavanja i isparavanja goriva u uvjetima povišene temperature goriva i niskog tlaka komore izgaranja

Benković, Dajana (2018) Numeričko modeliranje procesa ubrizgavanja i isparavanja goriva u uvjetima povišene temperature goriva i niskog tlaka komore izgaranja. = Numerical Modelling of the Gasoline Fuel Injection Process Under the Flash Boiling Conditions. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Vujanović, Milan.

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Abstract (Croatian)

Sigurnost i pouzdanost glavni su prioriteti u zrakoplovnoj industriji, zbog čega se teži ka usavršavanju svakog dijela te svakog procesa. Motori s unutarnjim sagorijevanjem ne predstavljaju iznimku: evolucija motora s unutarnjim sagorijevanjem za sobom povlači i razvoj te razumijevanje svakog segmenta procesa izgaranja motora. Sustav kojim se gorivo dovodi u komoru izgaranja predstavlja jedan od mnogih čimbenika koji izravno utječu na proces izgaranja. Nagli razvoj tehnologije ubrizgavanja goriva nudi mogućnost primjene brojnih prednosti takvog sustava dobave goriva. Iz tog razloga, korištenjem modernog inženjerskog alata u svrhu istraživanja raznovrsnih inženjerskih sustava - računalne dinamike fluida (RDF), ovaj rad obuhvaća numeričku analizu sustava direktnog ubrizgavanja goriva u flash boiling operativnim uvjetima motora. Flash boiling je pojava brzog smanjenja tlaka predgrijanje kapljevine na vrijednost tlaka manju od tlaka zasićenja kapljevine. Numerička analiza realne geometrije benzinske brizgaljke, provedena je unutar komercijalnog programskog paketa za računalnu dinamiku fluida AVL FIRE TM. Kako bi se reproduciralo stvarno pomicanje dijelova brizgaljke tijekom procesa ubrizgavanja goriva, izrađena je pomična računalna domena. Definirane su numeričke postavke rješavača, uključujući i rubne te početne uvjete za oba promatrana slučaja: standarni te flash boiling slučaj. Nadalje, provedna je analiza dobivenih rezultata, nakog čega su dane usporedbe dvaju razmatranih režima procesa ubrzgavanja goriva. Rezultati flash boiling simulacije na kraju su uspoređeni s eksperimentalnim podacima te numeričkim rezultatima, utvrđenim iz proračuna provedenih u drugom računalnom kodu.

Abstract

Safety and reliability are a priority in aerospace industry today and in the relentless pursuit for improvements every part and every process is scrutinized. Internal combustion engines are not an exception: evolution of the internal combustion engines includes understanding and development of every segment of the engine combustion process. The fuel delivery system represents one of the many factors which was found to have a direct impact on the combustion process. Due to the large-scale development of the fuel injection technology, many advantages of such fuel delivery system are recognized and applicable. For that reason, by using a modern engineering tool for investigation of various engineering systems---Computational Fluid Dynamics (CFD), a numerical analysis of the direct fuel injection system under the flash boiling operating conditions was performed in this thesis. Flash boiling is a phenomenon of preheated liquid depressurization to the value below the liquid saturation pressure. Numerical investigation of a gasoline injector was carried out in commercial computational fluid dynamics software AVL FIRE TM. In order to reproduce the actual movement of injector parts during the injection process, a moving computational domain was created. Numerical setup, that includes definitions of boundary and initial conditions, as well as the solver setup of both standard and flash boiling operating conditions, was presented. Postprocessing of obtained results was made afterwards, and the flash boiling case was compared with the standard one. Finally, the results of the flash boiling simulation were compared with the available experimental data and numerical results from the literature.

Item Type: Thesis (Master's thesis (Bologna))
Uncontrolled Keywords: Flash Boiling; Spray G2; isparavanje goriva; direktno ubrizgavanje goriva; CFD
Keywords (Croatian): Flash Boiling; Spray G2; fuel vaporization; direct fuel injection; CFD
Subjects: TECHNICAL SCIENCE > Aviation, rocket and space technology
Divisions: 500 Department of Energy, Power Engineering and Environment > 510 Power Engineering and Energy Management Chair
Date Deposited: 07 Dec 2018 10:56
Last Modified: 08 Jul 2019 10:50
URI: http://repozitorij.fsb.hr/id/eprint/8995

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