Ventilation performance and pollutant flow in a unidirectional-traffic road tunnel
Abstract
To develop a reliable method for modeling fire case scenarios within the road tunnels and observing the effects of the skewed velocity, experimental and numerical approach is used. Experimental results obtained from a laboratory tunnel model installation, are used to define geometry and boundary conditions. The result for the overall ventilation performance is compared to the available cases, for empty tunnel and stationary bi-directional vehicle traffic. For a unidirectional traffic road tunnel, in traffic loaded conditions, with a ventilation system based on axial ducted fans, the numerical simulation is used to determine the flow and temperature fields, the ventilation efficiency (efficiency of momentum transfer), and to assess the shape of the velocity distribution. The effect that a skewed velocity distribution can have on the resulting thermal and pollutant fields (CO2), smoke backlayering and stratification, is evaluated using numerical simulations, for the model-scale tunnel fi...re conditions. The effect of two possible limiting shapes of the velocity distribution, dependent only on the location of the fire with respect to the nearest upstream operating fans, is analyzed. The numerical results for a fire are scenario are a starting point in assessing the feasibility of a laboratory model fire-scenario experiment, what is planned as the next step in this research.
Keywords:
ventilation efficiency / traffic tunnel / fire / boundary conditions / axial ducted fansSource:
Thermal Science, 2017, 21, S783-S794Publisher:
- Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
Funding / projects:
- Ministry of Science of Montenegro
- Faculty of Mechanical Engineering, University of Montenegro
- Laboratory for Hydraulic Machinery and Energy Systems, Faculty of Mechanical Engineering, University of Belgrade
- Application of Novel Measurement and Computational Techniques on Investigation of Air Flow in Ventilation Systems of Energy Extremely Efficient (“Passive”) Buildings (RS-MESTD-Technological Development (TD or TR)-35046)
DOI: 10.2298/TSCI160321117S
ISSN: 0354-9836
WoS: 000418781900021
Scopus: 2-s2.0-85041644006
Collections
Institution/Community
Mašinski fakultetTY - JOUR AU - Sekularac, Milan B. AU - Janković, Novica AU - Vukoslavčević, Petar PY - 2017 UR - https://machinery.mas.bg.ac.rs/handle/123456789/2620 AB - To develop a reliable method for modeling fire case scenarios within the road tunnels and observing the effects of the skewed velocity, experimental and numerical approach is used. Experimental results obtained from a laboratory tunnel model installation, are used to define geometry and boundary conditions. The result for the overall ventilation performance is compared to the available cases, for empty tunnel and stationary bi-directional vehicle traffic. For a unidirectional traffic road tunnel, in traffic loaded conditions, with a ventilation system based on axial ducted fans, the numerical simulation is used to determine the flow and temperature fields, the ventilation efficiency (efficiency of momentum transfer), and to assess the shape of the velocity distribution. The effect that a skewed velocity distribution can have on the resulting thermal and pollutant fields (CO2), smoke backlayering and stratification, is evaluated using numerical simulations, for the model-scale tunnel fire conditions. The effect of two possible limiting shapes of the velocity distribution, dependent only on the location of the fire with respect to the nearest upstream operating fans, is analyzed. The numerical results for a fire are scenario are a starting point in assessing the feasibility of a laboratory model fire-scenario experiment, what is planned as the next step in this research. PB - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd T2 - Thermal Science T1 - Ventilation performance and pollutant flow in a unidirectional-traffic road tunnel EP - S794 SP - S783 VL - 21 DO - 10.2298/TSCI160321117S ER -
@article{ author = "Sekularac, Milan B. and Janković, Novica and Vukoslavčević, Petar", year = "2017", abstract = "To develop a reliable method for modeling fire case scenarios within the road tunnels and observing the effects of the skewed velocity, experimental and numerical approach is used. Experimental results obtained from a laboratory tunnel model installation, are used to define geometry and boundary conditions. The result for the overall ventilation performance is compared to the available cases, for empty tunnel and stationary bi-directional vehicle traffic. For a unidirectional traffic road tunnel, in traffic loaded conditions, with a ventilation system based on axial ducted fans, the numerical simulation is used to determine the flow and temperature fields, the ventilation efficiency (efficiency of momentum transfer), and to assess the shape of the velocity distribution. The effect that a skewed velocity distribution can have on the resulting thermal and pollutant fields (CO2), smoke backlayering and stratification, is evaluated using numerical simulations, for the model-scale tunnel fire conditions. The effect of two possible limiting shapes of the velocity distribution, dependent only on the location of the fire with respect to the nearest upstream operating fans, is analyzed. The numerical results for a fire are scenario are a starting point in assessing the feasibility of a laboratory model fire-scenario experiment, what is planned as the next step in this research.", publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd", journal = "Thermal Science", title = "Ventilation performance and pollutant flow in a unidirectional-traffic road tunnel", pages = "S794-S783", volume = "21", doi = "10.2298/TSCI160321117S" }
Sekularac, M. B., Janković, N.,& Vukoslavčević, P.. (2017). Ventilation performance and pollutant flow in a unidirectional-traffic road tunnel. in Thermal Science Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 21, S783-S794. https://doi.org/10.2298/TSCI160321117S
Sekularac MB, Janković N, Vukoslavčević P. Ventilation performance and pollutant flow in a unidirectional-traffic road tunnel. in Thermal Science. 2017;21:S783-S794. doi:10.2298/TSCI160321117S .
Sekularac, Milan B., Janković, Novica, Vukoslavčević, Petar, "Ventilation performance and pollutant flow in a unidirectional-traffic road tunnel" in Thermal Science, 21 (2017):S783-S794, https://doi.org/10.2298/TSCI160321117S . .