Petrovic, Velimir S.

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  • Petrovic, Velimir S. (3)
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Author's Bibliography

The Possibilities for Measurement and Characterization of Diesel Engine Fine Particles - a Review

Petrovic, Velimir S.; Janković, Slobodan P.; Tomić, Miroljub V.; Jovanović, Zoran S.; Knežević, Dragan M.

(2011)

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 . .
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Some Subtleties Concerning Fluid Flow and Turbulence Modeling in 4-Valve Engines

Jovanović, Zoran S.; Basara, Branislav S.; Tomić, Miroljub V.; Petrovic, Velimir S.

(2011)

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 . .
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The Effect of Bowl-In-Piston Geometry Layout on Fluid Flow Pattern

Jovanović, Zoran S.; Živanović, Zlatomir M.; Šakota, Željko; Tomić, Miroljub V.; Petrovic, Velimir S.

(2011)

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 . .
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