TY  - JOUR
AU  - Tomić, Miroljub V.
AU  - Jovanović, Zoran S.
AU  - Mišanović, Slobodan M.
AU  - Živanović, Zlatomir M.
AU  - Masoničić, Zoran
PY  - 2018
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=0354-98361700310T
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7810
AB  - This paper presents the analysis and comparison of energy and environmental properties of various city bus systems: diesel and compressed natural gas internal combustion engines, trolleybus, and battery electric bus. It is based on experimental research on fuel and energy consumption of city buses with aforementioned propulsion systems carried out under similar driving conditions - on the same city bus lines in Belgrade and Novi Sad, and on evaluation of energy efficiency and CO2 emission of real electricity production in Serbia. In this way, "tank-to-wheel" and "well-to-wheel" energy consumption and CO2 emissions of considered bus driving systems have been evaluated and compared. The results show all complexity of the matter since benefits of application of different systems largely depends on bus exploitation conditions and even more of the conditions of electric energy production. The compressed natural gas internal combustion engine compared to the Diesel engine provides obviously benefit in harmful gas emissions. However, CO2 emissions are on a similar level, while energy efficiency is even less. Electric propulsion systems provide undoubtedly benefit in energy consumption, harmful gases and CO2 emissions if tank-to-wheel conditions are considered, but well-to-wheel characteristics strongly depend on the condition of electric energy production.
T2  - Thermal Science
T1  - Some energetic and ecological aspects of different city bus drive systems
VL  - 22
IS  - 3
SP  - 1493
EP  - 1504
DO  - 10.2298/TSCI171027310T
ER  - 

@article{
author = "Tomić, Miroljub V. and Jovanović, Zoran S. and Mišanović, Slobodan M. and Živanović, Zlatomir M. and Masoničić, Zoran",
year = "2018",
abstract = "This paper presents the analysis and comparison of energy and environmental properties of various city bus systems: diesel and compressed natural gas internal combustion engines, trolleybus, and battery electric bus. It is based on experimental research on fuel and energy consumption of city buses with aforementioned propulsion systems carried out under similar driving conditions - on the same city bus lines in Belgrade and Novi Sad, and on evaluation of energy efficiency and CO2 emission of real electricity production in Serbia. In this way, "tank-to-wheel" and "well-to-wheel" energy consumption and CO2 emissions of considered bus driving systems have been evaluated and compared. The results show all complexity of the matter since benefits of application of different systems largely depends on bus exploitation conditions and even more of the conditions of electric energy production. The compressed natural gas internal combustion engine compared to the Diesel engine provides obviously benefit in harmful gas emissions. However, CO2 emissions are on a similar level, while energy efficiency is even less. Electric propulsion systems provide undoubtedly benefit in energy consumption, harmful gases and CO2 emissions if tank-to-wheel conditions are considered, but well-to-wheel characteristics strongly depend on the condition of electric energy production.",
journal = "Thermal Science",
title = "Some energetic and ecological aspects of different city bus drive systems",
volume = "22",
number = "3",
pages = "1493-1504",
doi = "10.2298/TSCI171027310T"
}

Tomić, M. V., Jovanović, Z. S., Mišanović, S. M., Živanović, Z. M.,& Masoničić, Z.. (2018). Some energetic and ecological aspects of different city bus drive systems. in Thermal Science, 22(3), 1493-1504.
https://doi.org/10.2298/TSCI171027310T

Tomić MV, Jovanović ZS, Mišanović SM, Živanović ZM, Masoničić Z. Some energetic and ecological aspects of different city bus drive systems. in Thermal Science. 2018;22(3):1493-1504.
doi:10.2298/TSCI171027310T .

Tomić, Miroljub V., Jovanović, Zoran S., Mišanović, Slobodan M., Živanović, Zlatomir M., Masoničić, Zoran, "Some energetic and ecological aspects of different city bus drive systems" in Thermal Science, 22, no. 3 (2018):1493-1504,
https://doi.org/10.2298/TSCI171027310T . .

TY  - JOUR
AU  - Petrovic, Velimir S.
AU  - Janković, Slobodan P.
AU  - Tomić, Miroljub V.
AU  - Jovanović, Zoran S.
AU  - Knežević, Dragan M.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4632
AB  - This review paper considers possible instrumentation for diesel engine fine particles exhaust emission evaluation. The modern diesel engines have extremely low particles emission almost at the level of measurement error of existing gravimetric measurement method. Since coarse particles are eliminated by new engine technologies, fine particles, with very negative effects on human health, dominate in the emission of current diesel engine. Therefore, it is necessary not only to measure mass of emitted particles but also to investigate other important particle characteristics as: particles number, particle size, particle number and mass distribution, particle active surface, particle composition, etc. Therefore, existing measurement technologies used in aerosol science can be used also to study diesel engine particles properties. This most common instrumentation in aerosol technique is shortly reviewed in the paper with special attention on candidate instruments included in EU program on portable emissions measurement systems.
T2  - Thermal Science
T1  - The Possibilities for Measurement and Characterization of Diesel Engine Fine Particles - a Review
VL  - 15
IS  - 4
SP  - 915
EP  - 938
DO  - 10.2298/TSCI110509092P
ER  - 

@article{
author = "Petrovic, Velimir S. and Janković, Slobodan P. and Tomić, Miroljub V. and Jovanović, Zoran S. and Knežević, Dragan M.",
year = "2011",
abstract = "This review paper considers possible instrumentation for diesel engine fine particles exhaust emission evaluation. The modern diesel engines have extremely low particles emission almost at the level of measurement error of existing gravimetric measurement method. Since coarse particles are eliminated by new engine technologies, fine particles, with very negative effects on human health, dominate in the emission of current diesel engine. Therefore, it is necessary not only to measure mass of emitted particles but also to investigate other important particle characteristics as: particles number, particle size, particle number and mass distribution, particle active surface, particle composition, etc. Therefore, existing measurement technologies used in aerosol science can be used also to study diesel engine particles properties. This most common instrumentation in aerosol technique is shortly reviewed in the paper with special attention on candidate instruments included in EU program on portable emissions measurement systems.",
journal = "Thermal Science",
title = "The Possibilities for Measurement and Characterization of Diesel Engine Fine Particles - a Review",
volume = "15",
number = "4",
pages = "915-938",
doi = "10.2298/TSCI110509092P"
}

Petrovic, V. S., Janković, S. P., Tomić, M. V., Jovanović, Z. S.,& Knežević, D. M.. (2011). The Possibilities for Measurement and Characterization of Diesel Engine Fine Particles - a Review. in Thermal Science, 15(4), 915-938.
https://doi.org/10.2298/TSCI110509092P

Petrovic VS, Janković SP, Tomić MV, Jovanović ZS, Knežević DM. The Possibilities for Measurement and Characterization of Diesel Engine Fine Particles - a Review. in Thermal Science. 2011;15(4):915-938.
doi:10.2298/TSCI110509092P .

Petrovic, Velimir S., Janković, Slobodan P., Tomić, Miroljub V., Jovanović, Zoran S., Knežević, Dragan M., "The Possibilities for Measurement and Characterization of Diesel Engine Fine Particles - a Review" in Thermal Science, 15, no. 4 (2011):915-938,
https://doi.org/10.2298/TSCI110509092P . .

TY  - JOUR
AU  - Jovanović, Zoran S.
AU  - Basara, Branislav S.
AU  - Tomić, Miroljub V.
AU  - Petrovic, Velimir S.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4633
AB  - In this paper some results concerning the structure and evolution of fluid flow pattern during induction and compression in 4- valve engines with tilted valves were presented. Results were obtained by dint of multidimensional modeling of non-reactive flows in arbitrary geometry with moving boundaries. During induction fluid flow pattern was characterized with organized tumble motion followed by small but clearly legible deterioration in the vicinity of the bottom dead center. During compression the fluid flow pattern is entirely three-dimensional and fully controlled by vortex motion located in the central part of the chamber. In order to annihilate negative effects of tumble deterioration and to enhance swirling motion one of the intake valves was deactivated. Some positive and negative effects of such attempt were elucidated. The effect of turbulence model alteration in the case of excessive macro flows was tackled as well. Namely, some results obtained with eddy-viscosity model i. e. standard k-epsilon model were compared with results obtained with k-xi-f model of turbulence in domain of 4-valve engine in-cylinder flow. Some interesting results emerged rendering impetus for further quest in the near future.
T2  - Thermal Science
T1  - Some Subtleties Concerning Fluid Flow and Turbulence Modeling in 4-Valve Engines
VL  - 15
IS  - 4
SP  - 1065
EP  - 1079
DO  - 10.2298/TSCI110825104J
ER  - 

@article{
author = "Jovanović, Zoran S. and Basara, Branislav S. and Tomić, Miroljub V. and Petrovic, Velimir S.",
year = "2011",
abstract = "In this paper some results concerning the structure and evolution of fluid flow pattern during induction and compression in 4- valve engines with tilted valves were presented. Results were obtained by dint of multidimensional modeling of non-reactive flows in arbitrary geometry with moving boundaries. During induction fluid flow pattern was characterized with organized tumble motion followed by small but clearly legible deterioration in the vicinity of the bottom dead center. During compression the fluid flow pattern is entirely three-dimensional and fully controlled by vortex motion located in the central part of the chamber. In order to annihilate negative effects of tumble deterioration and to enhance swirling motion one of the intake valves was deactivated. Some positive and negative effects of such attempt were elucidated. The effect of turbulence model alteration in the case of excessive macro flows was tackled as well. Namely, some results obtained with eddy-viscosity model i. e. standard k-epsilon model were compared with results obtained with k-xi-f model of turbulence in domain of 4-valve engine in-cylinder flow. Some interesting results emerged rendering impetus for further quest in the near future.",
journal = "Thermal Science",
title = "Some Subtleties Concerning Fluid Flow and Turbulence Modeling in 4-Valve Engines",
volume = "15",
number = "4",
pages = "1065-1079",
doi = "10.2298/TSCI110825104J"
}

Jovanović, Z. S., Basara, B. S., Tomić, M. V.,& Petrovic, V. S.. (2011). Some Subtleties Concerning Fluid Flow and Turbulence Modeling in 4-Valve Engines. in Thermal Science, 15(4), 1065-1079.
https://doi.org/10.2298/TSCI110825104J

Jovanović ZS, Basara BS, Tomić MV, Petrovic VS. Some Subtleties Concerning Fluid Flow and Turbulence Modeling in 4-Valve Engines. in Thermal Science. 2011;15(4):1065-1079.
doi:10.2298/TSCI110825104J .

Jovanović, Zoran S., Basara, Branislav S., Tomić, Miroljub V., Petrovic, Velimir S., "Some Subtleties Concerning Fluid Flow and Turbulence Modeling in 4-Valve Engines" in Thermal Science, 15, no. 4 (2011):1065-1079,
https://doi.org/10.2298/TSCI110825104J . .

TY  - JOUR
AU  - Jovanović, Zoran S.
AU  - Živanović, Zlatomir M.
AU  - Šakota, Željko
AU  - Tomić, Miroljub V.
AU  - Petrovic, Velimir S.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4557
AB  - In this paper some results concerning the evolution of 3-D fluid flow pattern through all four strokes in combustion chambers with entirely different bowl-in-piston geometry layouts ranging from omega to simple cylinder were presented. All combustion chambers i. e. those with omega bowls, with different profiles, and those with cylinder bowls, with different squish area ranging from 44% to 62%, were with flat head, vertical valves, and identical elevation of intake and exhaust ports. A bunch of results emerged by dint of multidimensional modeling of non-reactive fluid flow in arbitrary geometry with moving objects and boundaries. The fluid flow pattern during induction and compression in all cases was extremely complicated and entirely 3-D. It should be noted that significant differences due to geometry of the bowl were encountered only in the vicinity of top dead centre. Namely, in the case of omega bowl all three types of organized macro flows were observed while in the case of cylinder bowl no circumferential velocity was registered at all. On the contrary, in the case of cylinder bowl some interesting results concerning reverse tumble and its center of rotation shifting from exhaust valve zone to intake valve zone during induction stroke and vice-verse from intake valve zone to exhaust valve zone during compression were observed while in the case of omega bowl no such a displacement was legible. During expansion the fluid flow pattern is fully controlled by piston motion and during exhaust it is mainly 1-D, except in the close proximity of exhaust valve. For that reason it is not affected by the geometry of the bowl.
T2  - Thermal Science
T1  - The Effect of Bowl-In-Piston Geometry Layout on Fluid Flow Pattern
VL  - 15
IS  - 3
SP  - 817
EP  - 832
DO  - 10.2298/TSCI110417040J
ER  - 

@article{
author = "Jovanović, Zoran S. and Živanović, Zlatomir M. and Šakota, Željko and Tomić, Miroljub V. and Petrovic, Velimir S.",
year = "2011",
abstract = "In this paper some results concerning the evolution of 3-D fluid flow pattern through all four strokes in combustion chambers with entirely different bowl-in-piston geometry layouts ranging from omega to simple cylinder were presented. All combustion chambers i. e. those with omega bowls, with different profiles, and those with cylinder bowls, with different squish area ranging from 44% to 62%, were with flat head, vertical valves, and identical elevation of intake and exhaust ports. A bunch of results emerged by dint of multidimensional modeling of non-reactive fluid flow in arbitrary geometry with moving objects and boundaries. The fluid flow pattern during induction and compression in all cases was extremely complicated and entirely 3-D. It should be noted that significant differences due to geometry of the bowl were encountered only in the vicinity of top dead centre. Namely, in the case of omega bowl all three types of organized macro flows were observed while in the case of cylinder bowl no circumferential velocity was registered at all. On the contrary, in the case of cylinder bowl some interesting results concerning reverse tumble and its center of rotation shifting from exhaust valve zone to intake valve zone during induction stroke and vice-verse from intake valve zone to exhaust valve zone during compression were observed while in the case of omega bowl no such a displacement was legible. During expansion the fluid flow pattern is fully controlled by piston motion and during exhaust it is mainly 1-D, except in the close proximity of exhaust valve. For that reason it is not affected by the geometry of the bowl.",
journal = "Thermal Science",
title = "The Effect of Bowl-In-Piston Geometry Layout on Fluid Flow Pattern",
volume = "15",
number = "3",
pages = "817-832",
doi = "10.2298/TSCI110417040J"
}

Jovanović, Z. S., Živanović, Z. M., Šakota, Ž., Tomić, M. V.,& Petrovic, V. S.. (2011). The Effect of Bowl-In-Piston Geometry Layout on Fluid Flow Pattern. in Thermal Science, 15(3), 817-832.
https://doi.org/10.2298/TSCI110417040J

Jovanović ZS, Živanović ZM, Šakota Ž, Tomić MV, Petrovic VS. The Effect of Bowl-In-Piston Geometry Layout on Fluid Flow Pattern. in Thermal Science. 2011;15(3):817-832.
doi:10.2298/TSCI110417040J .

Jovanović, Zoran S., Živanović, Zlatomir M., Šakota, Željko, Tomić, Miroljub V., Petrovic, Velimir S., "The Effect of Bowl-In-Piston Geometry Layout on Fluid Flow Pattern" in Thermal Science, 15, no. 3 (2011):817-832,
https://doi.org/10.2298/TSCI110417040J . .

TY  - JOUR
AU  - Tomić, Miroljub V.
AU  - Popovic, Slobodan J.
AU  - Miljic, Nenad L.
AU  - Petrović, Stojan V.
AU  - Cvetic, Milog R.
AU  - Knežević, Dragan M.
AU  - Jovanović, Zoran S.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3429
AB  - In this paper a simplified procedure of an internal combustion engine in-cylinder pressure record analysis has been presented The method is very easy for programming and provides quick evaluation of the gas temperature and the rate of combustion. It is based on the consideration proposed by Hohenberg and Killman, but enhances the approach by involving the rate of heat transferred to the walls that was omitted in the original approach. It enables the evaluation of the complete rate Of heat released by combustion (often designated as gross heat release rate or fuel chemical energy release rate), not only the rate of heat transferred to the gas (which is often designated as net heat release rate). The accuracy of the method has been also analyzed and it is shown that the errors caused by the simplifications in the model are very small, particularly if the crank angle step is also small A several practical applications on recorded pressure diagrams taken from both spark ignition and compression ignition engine are presented as well.
T2  - Thermal Science
T1  - A quick, simplified approach to the evaluation of combustion rate from an internal combustion engine indicator diagram
VL  - 12
IS  - 1
SP  - 85
EP  - 102
DO  - 10.2298/TSCI0801085T
ER  - 

@article{
author = "Tomić, Miroljub V. and Popovic, Slobodan J. and Miljic, Nenad L. and Petrović, Stojan V. and Cvetic, Milog R. and Knežević, Dragan M. and Jovanović, Zoran S.",
year = "2008",
abstract = "In this paper a simplified procedure of an internal combustion engine in-cylinder pressure record analysis has been presented The method is very easy for programming and provides quick evaluation of the gas temperature and the rate of combustion. It is based on the consideration proposed by Hohenberg and Killman, but enhances the approach by involving the rate of heat transferred to the walls that was omitted in the original approach. It enables the evaluation of the complete rate Of heat released by combustion (often designated as gross heat release rate or fuel chemical energy release rate), not only the rate of heat transferred to the gas (which is often designated as net heat release rate). The accuracy of the method has been also analyzed and it is shown that the errors caused by the simplifications in the model are very small, particularly if the crank angle step is also small A several practical applications on recorded pressure diagrams taken from both spark ignition and compression ignition engine are presented as well.",
journal = "Thermal Science",
title = "A quick, simplified approach to the evaluation of combustion rate from an internal combustion engine indicator diagram",
volume = "12",
number = "1",
pages = "85-102",
doi = "10.2298/TSCI0801085T"
}

Tomić, M. V., Popovic, S. J., Miljic, N. L., Petrović, S. V., Cvetic, M. R., Knežević, D. M.,& Jovanović, Z. S.. (2008). A quick, simplified approach to the evaluation of combustion rate from an internal combustion engine indicator diagram. in Thermal Science, 12(1), 85-102.
https://doi.org/10.2298/TSCI0801085T

Tomić MV, Popovic SJ, Miljic NL, Petrović SV, Cvetic MR, Knežević DM, Jovanović ZS. A quick, simplified approach to the evaluation of combustion rate from an internal combustion engine indicator diagram. in Thermal Science. 2008;12(1):85-102.
doi:10.2298/TSCI0801085T .

Tomić, Miroljub V., Popovic, Slobodan J., Miljic, Nenad L., Petrović, Stojan V., Cvetic, Milog R., Knežević, Dragan M., Jovanović, Zoran S., "A quick, simplified approach to the evaluation of combustion rate from an internal combustion engine indicator diagram" in Thermal Science, 12, no. 1 (2008):85-102,
https://doi.org/10.2298/TSCI0801085T . .

TY  - JOUR
AU  - Jovanović, Zoran S.
AU  - Petrović, Stojan V.
AU  - Tomić, Miroljub V.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3428
AB  - In this paper some results concerning the combined effect of the fumble flow and combustion chamber geometry layout variations on flame front shape and its propagation through homogenous mixture of isooctane and air are presented Spatial distributions of NO in different combustion chamber geometries are presented as well. The basic combustion chamber geometry layout considered consists of the flat head with two vertical valves and a cylindrical bowl subjected to variations of depth and squish area. All results presented were obtained by dint of multidimensional modeling of reactive flows in arbitrary geometry with moving objects and boundaries with modified KIVA3 and KIVA3 V source codes. Two additional computer codes were applied to generate boundary conditions for KIVA3 V calculations with moving valves. The AVL TYCON code was used for the calculation of valve lift profiles, and A VL BOOST code was used for the calculation of relevant data set in the valve regions. Different combustion chamber geometry layouts generate different levels of squish, and the combustion effects in essence depend on the interaction of that flow with tumble. It was found that for particular combustion chamber shapes with different diameter/depth aspect ratios entirely different flame front shapes and propagation velocities were encountered primarily due to variations of fluid flow patterns in the vicinity of top dead center.
T2  - Thermal Science
T1  - The effect of combustion chamber geometry layout on combustion and emission
VL  - 12
IS  - 1
SP  - 7
EP  - 24
DO  - 10.2298/TSCI0801007J
ER  - 

@article{
author = "Jovanović, Zoran S. and Petrović, Stojan V. and Tomić, Miroljub V.",
year = "2008",
abstract = "In this paper some results concerning the combined effect of the fumble flow and combustion chamber geometry layout variations on flame front shape and its propagation through homogenous mixture of isooctane and air are presented Spatial distributions of NO in different combustion chamber geometries are presented as well. The basic combustion chamber geometry layout considered consists of the flat head with two vertical valves and a cylindrical bowl subjected to variations of depth and squish area. All results presented were obtained by dint of multidimensional modeling of reactive flows in arbitrary geometry with moving objects and boundaries with modified KIVA3 and KIVA3 V source codes. Two additional computer codes were applied to generate boundary conditions for KIVA3 V calculations with moving valves. The AVL TYCON code was used for the calculation of valve lift profiles, and A VL BOOST code was used for the calculation of relevant data set in the valve regions. Different combustion chamber geometry layouts generate different levels of squish, and the combustion effects in essence depend on the interaction of that flow with tumble. It was found that for particular combustion chamber shapes with different diameter/depth aspect ratios entirely different flame front shapes and propagation velocities were encountered primarily due to variations of fluid flow patterns in the vicinity of top dead center.",
journal = "Thermal Science",
title = "The effect of combustion chamber geometry layout on combustion and emission",
volume = "12",
number = "1",
pages = "7-24",
doi = "10.2298/TSCI0801007J"
}

Jovanović, Z. S., Petrović, S. V.,& Tomić, M. V.. (2008). The effect of combustion chamber geometry layout on combustion and emission. in Thermal Science, 12(1), 7-24.
https://doi.org/10.2298/TSCI0801007J

Jovanović ZS, Petrović SV, Tomić MV. The effect of combustion chamber geometry layout on combustion and emission. in Thermal Science. 2008;12(1):7-24.
doi:10.2298/TSCI0801007J .

Jovanović, Zoran S., Petrović, Stojan V., Tomić, Miroljub V., "The effect of combustion chamber geometry layout on combustion and emission" in Thermal Science, 12, no. 1 (2008):7-24,
https://doi.org/10.2298/TSCI0801007J . .