Water-based fixed fire fighting systems (WFFFS) have been considered as an option formitigating tunnel fires in addition to ventilation systems. Recent studies have shown that the WFFFScan control the Heat Release Rate (HRR), reduce the growth rate of fires, and cool down smoke.However, there is still a lack of understanding of the effect of the use of WFFFS with ventilationsystems. This paper presents a CFD study simulating full-scale experiments conducted in thelaboratory tunnel of Carleton University, in order to investigate the interaction between the watersprinkler system and longitudinal air flow in the tunnel. The cooling effect of a sprinkler system wastested by activating the system over a propane fire which generated a constant HRR. Both thesimulated and measured results show that a combination of ventilation and suppression systemimproves the cooling effect on the hot gases. The cooling was more significant for the use of largerwater flow density. The CFD simulations also predicted well the smoke flow in the tunnel with thesprinkler system active and the backlayering upstream of the fire that was affected by the water flowdensity.
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