Some subtleties concerning fluid flow and turbulence modeling in 4-valve engines
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-ε model were compared with results obtained with k-ξ-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.
Keywords:
turbulence modelling / automotive flows / 4-valve enginesSource:
Thermal Science, 2011, 15, 4, 1065-1079Publisher:
- Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
DOI: 10.2298/TSCI110825104J
ISSN: 0354-9836
WoS: 000298725400013
Scopus: 2-s2.0-84858788853
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Institution/Community
Inovacioni centarTY - JOUR AU - Jovanović, Zoran S. AU - Basara, Branislav S. AU - Tomić, Miroljub V. AU - Petrović, Velimir PY - 2011 UR - https://machinery.mas.bg.ac.rs/handle/123456789/1188 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-ε model were compared with results obtained with k-ξ-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. PB - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd T2 - Thermal Science T1 - Some subtleties concerning fluid flow and turbulence modeling in 4-valve engines EP - 1079 IS - 4 SP - 1065 VL - 15 DO - 10.2298/TSCI110825104J ER -
@article{ author = "Jovanović, Zoran S. and Basara, Branislav S. and Tomić, Miroljub V. and Petrović, Velimir", 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-ε model were compared with results obtained with k-ξ-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.", publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd", journal = "Thermal Science", title = "Some subtleties concerning fluid flow and turbulence modeling in 4-valve engines", pages = "1079-1065", number = "4", volume = "15", doi = "10.2298/TSCI110825104J" }
Jovanović, Z. S., Basara, B. S., Tomić, M. V.,& Petrović, V.. (2011). Some subtleties concerning fluid flow and turbulence modeling in 4-valve engines. in Thermal Science Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 15(4), 1065-1079. https://doi.org/10.2298/TSCI110825104J
Jovanović ZS, Basara BS, Tomić MV, Petrović V. 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., Petrović, Velimir, "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 . .