Numerical Studies on the Performance of Saccardo Ventilation System in Emergency Fire Scenarios

Abstract:

In this study, the influence of volumetric flow rate and inclination angle of air jet is evaluated on the performance of a Saccardo ventilation system in a straight rectangular tunnel in case of fire. Simultaneous effects of volumetric flow rate and inclination angle of jet exiting the Saccardo nozzle on the behavior of smoke plume is considered by studying the structure of velocity profile before the fire source. It is found that this factor has a remarkable influence on the behavior of smoke plume and therefore, on the temperatures experienced near the fire. Besides, the influence of tunnel slope on the performance of the Saccardo system to sweep the plume is investigated. It is shown that the slope effect on the behavior of smoke plume and temperature profiles is completely different for locations before and after the fire, in both negative and positive slopes. Finally a range of volumetric flow rates and inclination angles is proposed as the optimized range of performance in an emergency fire scenario.

• Periodical: Applied Mechanics and Materials (Volume 527)
• Pages: 146-151
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.527.146
• Online since: February 2014
• Authors: Rouhollah Ganjiazad*, Ali Kazemipour, Hossein Afshin, Bijan Farhanieh
• Keywords: Fire, Longitudinal Ventilation, Road Tunnel, Saccardo System, Tunnel Slope

References

[1] PIARC Committee on Road Tunnels, Fire and Smoke Control in Road Tunnels (1998).

[2] V. Betta, Cascetta, M. Musto, G. Rotondo, Numerical study of the optimization of the pitch angle of an alternative jet fan in a longitudinal tunnel ventilation system, Tunneling and Underground Space Technology 24 (2009) 164-172.

DOI: 10.1016/j.tust.2008.06.002

[3] Saccardo, New Systems of Artificial Ventilation, Giomale Genio Civile (1889) p.479.

[4] Saccardo, The Artificial Ventilation in Tunnels and the Experimental Plant of Procchia, Mantova (1894).

[5] M. Felli, A Study of Longitudinal Ventilation System for Tunnels, 2nd International Symp. On Aerodynamics and Ventilation of Vehicle Tunnels, BHRG, Cambridge, UK (1976) Paper A-3: 55-69.

[6] I. Yoshizawa, T. Ohuchi, K. Komatsu, Y. Ohta, K. Hagiwara, Characteristics of Blowing and Exhaust Nozzles Used in a Longitudinal Ventilation System, 7th International Symp. On Aerodynamics and Ventilation of Vehicle Tunnels, BHRG, Brighton, UK (1991).

[7] M. Tabarra, R.D. Matthews, B. Kenrick, The Revival of Saccardo Ejectors – History Fundamentals and Applications, 10th International Symp. On Aerodynamics and Ventilation of Vehicle Tunnels, BHRG, Boston, USA (2000) ISBN 1 86058 255 9, 1037-1054.

[8] R.D. Matthews, M. Tabarra, A. Boudy, The Use of Saccardo Nozzles to Provide a Safe Haven and Smoke Control for the Proposed CTRL Thames Rail Tunnel, SRRT Conference, ITC, Madrid (2001).

[9] M. Tabarra, Longitudinal Tunnel Ventilation Using Saccardo Ejectors from the 19th to 21st Century, Proceedings of ASME FEDSM'01: ASME 2001 Fluids Engineering Division Summer Meeting New Orleans, Louisiana (2001) 679-695.

[10] F. Tarada, F. Brandt, Impulse Ventilation for Tunnels – A State of the Art Review, 13th International Symp. on Aerodynamics and Ventilation of Vehicle Tunnels, New Brunswick, New Jersey, USA (2009).

[11] L.H. Hu, F. Tang, D. Yang, S. Liu, R. Huo, Longitudinal distributions of CO concentration and difference with temperature field in a tunnel fire smoke flow, International Journal of Heat and Mass Transfer 53 (2010) 2844-2855.

DOI: 10.1016/j.ijheatmasstransfer.2010.02.013

[12] K. McGrattan, R. McDermott, S. Hostikka, J. Floyd, Fire Dynamics Simulator (Version 5) User's Guide, National Institute of Standards and Technology Special Publication 1019-5.

DOI: 10.6028/nist.sp.1019-5