Title
Istraživanje karakteristika ubrizgavanja ulja repice i njegovog metilestra pod visokim pritiscima u motorima SUS
Creator
Boban D., Nikolić 1967-
Copyright date
2016
Object Links
Select license
Autorstvo-Nekomercijalno-Bez prerade 3.0 Srbija (CC BY-NC-ND 3.0)
License description
Dozvoljavate samo preuzimanje i distribuciju dela, ako/dok se pravilno naznačava ime autora, bez ikakvih promena dela i bez prava komercijalnog korišćenja dela. Ova licenca je najstroža CC licenca. Osnovni opis Licence: http://creativecommons.org/licenses/by-nc-nd/3.0/rs/deed.sr_LATN. Sadržaj ugovora u celini: http://creativecommons.org/licenses/by-nc-nd/3.0/rs/legalcode.sr-Latn
Language
Serbian
Cobiss-ID
Theses Type
Doktorska disertacija
description
Datum odbrane: 11.03.2016.
Other responsibilities
mentor
Kegl, Breda
član komisije
Klinar, Ivan 1947-
član komisije
Stefanović, Gordana
član komisije
Radenković, Goran 1955-
član komisije
Jovanović, Miloš 1965-
Academic Expertise
Prirodno-matematičke nauke
Academic Title
-
University
Univerzitet u Nišu
Faculty
Mašinski fakultet
Group
Katedra za mašinske konstrukcije, razvoj i inženjering
Alternative title
Research on the injection characteristics of rapeseed and its methylester at high pressure in IC engines
Publisher
[B. D. Nikolić]
Format
[8], XVIII, 208 listova
description
Internal Combustion Engines and Motor Vehicles
Abstract (en)
The dissertation provides the basic requirements for alternative fuels with regard to
their application as fuels for internal combustion engines, and it analyzes the
characteristics of vegetable oils as potential fuels for diesel engines and the
possibilities of adapting them to the requirements of modern diesel engines, with a
particular focus on rapeseed oil. The thesis includes a review (with basic
characteristics) of the raw material base for obtaining, first vegetable oils, and then
biodiesel (vegetable oil methyl or ethyl-ester), as well as an overview of goals, the
current state and trends in the previous period in the European Union concerning the
ratio of raw material bases in biodiesel production, the consumption, production,
import and supply of biodiesel, and a plan for future biodiesel exploitation in the
Republic of Serbia. In the process of transformation of the chemical energy of fuel
into the mechanical work in diesel engines, the manner and quality of fuel-air mixture
formation has a dominant influence, which is in turn highly affected by the fuel
injection system. The thesis analyzes the operation of a selected fuel injection system
with the aim of identifying and observing the importance and effects of certain
physical characteristics of fuel on the operation of the fuel injection system, which
emphasizes the significance of the knowledge of the speed of sound, density and fuel
bulk modulus. To determine the dependence on the speed of sound, density and bulk
modulus of selected fuels (UR, B100, B50 and diesel) on the pressure (ranging from
the atmospheric to 1600 bar), an original experimental method was conceived and a
purpose-built apparatus was installed. After ascertaining the above physical
characteristics of examined fuels, the operation characteristics of selected fuel
injection systems were determined experimentally for three different fuels (B100, B50
and diesel). The results imply the influence of the differences in the speed of sound,
bulk modulus and density of selected fuels on the characteristics of the fuel injection
system, meaning that when biodiesel is used the pressure in front of the injector starts
to increase earlier and fuel injection engages earlier as well, the injection pressure
reaches its maximum earlier, a higher injection pressure is obtained, the injection time
is longer and the fuelling is higher, compared to the operation with diesel. A
numerical simulation was employed to determine the injection’s characteristic and the
integral injection’s characteristic. Also simulated were the fuel pressure curves and the
injector needle lift curves, with the implementation of mathematical dependences for
determining the physical characteristics of fuels, obtained on the basis of experimental
data. The visualization of the injected fuel spray showed that the biodiesel spray is
narrower, the spray length is longer and the spray projected area is smaller in
comparison with diesel.
Authors Key words
Biodizel, brzina zvuka, gustina, modul stišljivosti, ubrizgavanje goriva, mlaz goriva
Authors Key words
Biodiesel, speed of sound, density, bulk modulus, fuel injection, fuel spray
Classification
662.756.3:665.334.9]:621.436.038(043.3)
Subject
621.436.1:665.334.9(043.3)
Type
Elektronska teza
Abstract (en)
The dissertation provides the basic requirements for alternative fuels with regard to
their application as fuels for internal combustion engines, and it analyzes the
characteristics of vegetable oils as potential fuels for diesel engines and the
possibilities of adapting them to the requirements of modern diesel engines, with a
particular focus on rapeseed oil. The thesis includes a review (with basic
characteristics) of the raw material base for obtaining, first vegetable oils, and then
biodiesel (vegetable oil methyl or ethyl-ester), as well as an overview of goals, the
current state and trends in the previous period in the European Union concerning the
ratio of raw material bases in biodiesel production, the consumption, production,
import and supply of biodiesel, and a plan for future biodiesel exploitation in the
Republic of Serbia. In the process of transformation of the chemical energy of fuel
into the mechanical work in diesel engines, the manner and quality of fuel-air mixture
formation has a dominant influence, which is in turn highly affected by the fuel
injection system. The thesis analyzes the operation of a selected fuel injection system
with the aim of identifying and observing the importance and effects of certain
physical characteristics of fuel on the operation of the fuel injection system, which
emphasizes the significance of the knowledge of the speed of sound, density and fuel
bulk modulus. To determine the dependence on the speed of sound, density and bulk
modulus of selected fuels (UR, B100, B50 and diesel) on the pressure (ranging from
the atmospheric to 1600 bar), an original experimental method was conceived and a
purpose-built apparatus was installed. After ascertaining the above physical
characteristics of examined fuels, the operation characteristics of selected fuel
injection systems were determined experimentally for three different fuels (B100, B50
and diesel). The results imply the influence of the differences in the speed of sound,
bulk modulus and density of selected fuels on the characteristics of the fuel injection
system, meaning that when biodiesel is used the pressure in front of the injector starts
to increase earlier and fuel injection engages earlier as well, the injection pressure
reaches its maximum earlier, a higher injection pressure is obtained, the injection time
is longer and the fuelling is higher, compared to the operation with diesel. A
numerical simulation was employed to determine the injection’s characteristic and the
integral injection’s characteristic. Also simulated were the fuel pressure curves and the
injector needle lift curves, with the implementation of mathematical dependences for
determining the physical characteristics of fuels, obtained on the basis of experimental
data. The visualization of the injected fuel spray showed that the biodiesel spray is
narrower, the spray length is longer and the spray projected area is smaller in
comparison with diesel.
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