Numerična analiza vpliva geometrije zgorevalne predkomore na karakteristike zgorevanja pri bencinskih motorjih

magistrsko delo

Simon Bezenšek (Author), Matej Zadravec (Mentor), Luka Lešnik (Co-mentor)

Abstract

Razvoj motorjev z notranjim zgorevanjem je močno pogojen s predpisi, ki določajo zgornjo mejo dovoljenih emisij. Znižanje emisij CO2 se doseže z izboljšano termodinamično učinkovitostjo, znižanje emisij NOx pa z znižanjem temperature. Ta pogoja si pogosto nasprotujeta. Ena izmed obetavnih tehnologij, ki se je že uveljavila v Formuli 1, je zgorevalna predkomora, bodisi v aktivni ali pasivni obliki. Z doseganjem večje površine vžiga, se poveča hitrost zgorevanja in posledično se zmanjša specifična poraba goriva. Za optimalno delovanje motorja je potrebno poznati geometrijske vplive predkomore na proces zgorevanja. V tej nalogi je predstavljenih šest variant pasivne predkomore, za katere so bile izvedene numerične simulacije računalniške dinamike tekočin s programskim paketom AVL FIRE. Na podlagi rezultatov teh simulacij, se je ovrednotil proces zgorevanja in zasnovala nova varianta geometrije. Na koncu je podana ocena variant, prav tako pa je izpostavljena najboljša.

Keywords

predkomora;motor z notranjim zgorevanjem;bencinski motor GDI;računalniška dinamika tekočin;zgorevanje;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.09 - Master's Thesis
Organization:	UM FS - Faculty of Mechanical Engineering
Publisher:	[S. Bezenšek]
UDC:	621.434.05(043.2)
COBISS:	74610947
Views:	368
Downloads:	36
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Numerical analysis of prechamber geometry influence on combustion characteristics of gasoline engines
Secondary abstract:	The development of internal combustion engines is largely influenced by normatives, that set an upper limit for emissions. The reduction of CO2 emissions is achieved by increased thermodynamic efficiency, while the reduction of NOx emissions depends on the decrease of the temperature. These requirements are often conflicting. A promising technology, which has already been adapted in Formula 1, is the combustion prechamber, of either the passive or active type. By increasing the surface of mixture ignition, the rate of heat release is also increased, resulting in improved specific fuel consumption. For optimum operating conditions of the engine, a thorough understanding of geometry influence on the combustion process is required. Six variants of passive prechambers are analyzed in this thesis, for which computational fluid dynamics simulations have been carried out using the AVL FIRE software package. Based on the results of these simulation, the combustion process has been evaluated and new geometry designs have been proposed. At the end of this work is an assessment of the variants, also highlighting the best one.
Secondary keywords:	prechamber;internal combustion engine;GDI;computational fluid dynamics CFD;combustion;AVL FIRE;
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za strojništvo, Energetsko, procesno in okoljsko strojništvo
Pages:	XII, 109 f.
ID:	13019709