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Title:Vpliv biogoriv na tokovne razmere ter pojav kavitacije v brizgalni šobi dizelskega motorja : diplomsko delo
Authors:Leskovar, Alen (Author)
Kegl, Breda (Mentor) More about this mentor... New window
Lešnik, Luka (Co-mentor)
Files:.pdf UN_Leskovar_Alen_2018.pdf (2,25 MB)
MD5: 68661255C135813D17DF2DB92EEA31D6
 
Language:Slovenian
Work type:Bachelor thesis/paper (mb11)
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:V modernem svetu smo priča vztrajnemu naraščanju potreb po energiji v vseh možnih oblikah. Velik del je pretvarjamo v mehansko energijo, potrebno za pogon motornih vozil. Najenostavneje jo je pridobivati iz fosilnih goriv, vendar je iz ekološkega vidika nujno iskati alternativne rešitve. Predmet diplomskega dela je obravnava alternative mineralnemu dizelskemu gorivu, tako imenovenga biodizla. V Evropi je najpogostejša uporaba biodizla, pridelanega iz semen oljne ogrščice, ki ga lahko primešamo mineralnemu dizelskemu gorivu ter tako omilimo vplive na okolje. Primerjali smo tokovne razmere v mehansko krmiljeni vbrizgalni šobi dizelskega motorja pri uporabi mineralnega dizelskega goriva, mešanic s 25, 50 ter 75% dodanega biodizla, ter čistega biodizla. Izvedli smo numerične simulacije s pomočjo programa AVL FIRE, ter tako prišli do detajlnega grafičnega vpogleda v razvoj kavitacije, ki se v šobi pojavi kot produkt visokih lokalnih hitrosti, naglih sprememb smeri toka goriva ter prisotnih tlačnih padcev pod vrednost tlaka nasičenja. V vseh petih primerih smo priča razvoju kavitacijskega oblaka, ki sega vse od vtoka v izvrtino šobe in prodira tudi v območje kompresijskega prostora. Razlike so opazne vendar minimalne, na podlagi česar lahko sklepamo, da je obravnavan biodizel primeren za uporabo v motorjih, skonstruiranih za obratovanje z uporabo mineralnega dizelskega goriva.
Keywords:Kavitacija, vbrizgalna šoba, biodizel, numerična simulacija, AVL FIRE
Year of publishing:2018
Place of performance:Maribor
Publisher:[A. Leskovar]
Number of pages:IX, 39 f.
Source:Maribor
UDC:621.43.038(043.2)
COBISS_ID:22188310 New window
NUK URN:URN:SI:UM:DK:V6F1TBLZ
Views:432
Downloads:41
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Categories:KTFMB - FS
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:18.09.2018

Secondary language

Language:English
Title:The influence of biofuels on flow characteristics and cavitation phenomenon in diesel engine injector nozzle
Abstract:Global energy demands in all forms possible are continuously rising. Large amount of it is transformed every day into mechanical energy needed to power our vehicles. Since the use of fossil fuels is the cheapest and easiest way to satisfy our demands, alternative solutions are neccesary from ecological point of view. In this document, we will focus on use of rapeseed biodiesel as an alternative to conventional diesel fuel. Natural European environment allows us to grow plants that provides the source of biofuel mentioned above. It is possible to blend it with conventional diesel in order to reduce its impact on environment. We observed in-nozzle flow characteristics in five different fuel cases: pure diesel, 25, 50 and 75% blend of biodiesel and diesel, and pure biodiesel. AVL FIRE software was used for numerical simulations of fuel flow and gave us good insight on the appearance of cavitation cloud, caused by high fuel speed, quick changes in flow direction and related intense local pressure drops, below the vapor pressure of liquid fuel. Cavitation occurs in all five cases, it starts at hole inlet section and develops through all the way to compression chamber. There aro no major differencies between different fuel types, so we concluded that it is possible to use rapeseed biodiesel in engines made to run on conventional diesel, without any major modificaions.
Keywords:Cavitation, injection nozzle, biodiesel, numerical simulation, AVL FIRE


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