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Title:Obravnava zaprtega stanja igle med posameznimi vbrizgi v dizelskem injektorju
Authors:ID Štrucl, Jure (Author)
ID Škerget, Leopold (Mentor) More about this mentor... New window
Files:.pdf MAG_Strucl_Jure_2013.pdf (2,65 MB)
MD5: 8FB885E00CB344DFE0E9C2F810560D0A
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:Magistrska naloga obravnava numerično metodo, s katero je mogoče popisati tokovne razmere v sodobnem dizelskem injektorju tako v času posameznih vbrizgov kot tudi v času med njimi, kadar se smatra, da je tok tekočine popolnoma prekinjen. Metoda je namenjena natančni analizi tokovnih razmer v dizelskem injektorju, ki jih je eksperimentalno nemogoče obravnavati v takšnem obsegu, saj so dizelski injektorji, zlasti izstopna izvrtina na njih, ki je ključni del obravnave, dimenzijsko izredno majhni in skoraj nedostopni za merilno opremo. Vbrizg goriva je pri sodobnih motorjih razdeljen v več pod-vbrizgov. Lahko je sestavljen iz pred-vbrizga, glavnega vbrizga in po-vbrizga. Med posameznimi pod-vbrizgi je tok tekočine z injektorsko iglo večkrat ustavljen. Ravno ta prekinitev je bila v predhodnih simulacijah zanemarjena in vsako stopnjo vbrizga je bilo mogoče računati le ločeno kot posamezno simulacijo. Metoda, predstavljena v magistrski nalogi, omogoča preračun več pod-vbrizgov v eni sami simulaciji in pri tem ne zanemarja obdobja, ko je tok tekočine prekinjen. Metodologija je bila razvita v komercialnem CFD programu AVL FIRE.
Keywords:dizelski injektor, vbrizg goriva, pred-vbrizg, po-vbrizg, glavni vbrizg, zaprto stanje igle, pretok v šobi
Place of publishing:Maribor
Publisher:[J. Štrucl]
Year of publishing:2013
PID:20.500.12556/DKUM-42965 New window
UDC:[519.6:532.5]621.43.038(043.2)
COBISS.SI-ID:17627670 New window
NUK URN:URN:SI:UM:DK:LZPFI5NF
Publication date in DKUM:12.12.2013
Views:1540
Downloads:193
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Secondary language

Language:English
Title:Treatment of closed needle condition between injection events in a diesel injector
Abstract:The Master’s Thesis deals with the numerical method which can describe flow field conditions of a modern diesel injector at the time of injection and also at the time in between injections when the flow is supposed to be fully blocked by a closed needle. The method is intended for detailed analysis of flow field conditions in a diesel injector, which is experimentally impossible to such extent. Diesel injector dimensions and particularly the spray hole, which is the key part of the nozzle, is dimensionally small and virtually inaccessible with measurement equipment. In modern engines fuel injection is split in sub-injection events. It may consist of pre-injection, main-injection and post-injection. During the entire duration of injection the flow is blocked several times by the needle. Sequence of several sub-injection events could not be treated in the past, as the closed needle position could not be handled. Closed needle period has been neglected in previous simulations and each part of injection has been calculated separately as a stand-alone simulation for open needle condition only. With the method presented here, it is possible to calculate several sub-injection events in one single simulation, also including the period between sub-injections when the fluid flow is blocked. The methodology has been developed using the commercial CFD program AVL FIRE.
Keywords:diesel injector, fuel injection, pre-injection, main-injection, post-injection, closed needle, injector flow


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