Application of the Bernoulli Effect for Improving Smoke Exhaust Efficiency in Tunnel Fires

In South Korea, where mountainous terrain accounts for a significant proportion of the country, tunnels are essential reaching destinations via shortest possible route. Tunnels high-traffic areas with only two exits, making them vulnerable to large-scale disasters in event fire. However, existing longitudinal-flow-type exhaust systems (jet fans) insufficient effective smoke during tunnel Herein, new ventilation system is proposed that uses device nozzles expelling high-speed winds generate more robust flow at entrance. A computational fluid dynamics (CFD) analysis showed jet fan had wind speed 1.52 m/s exit. This removed total 37,053.9 kg air 600 s. By contrast, Bernoulli 1.85 exit and 53,308.4 The simulation results from scaled-down model safety testing facility were compared CFD results. ratio speeds between entrance was 2.7:1, exhibiting similar trend. conclusion, this study experimentally verified provided direction improving systems. can be foundational resource government agencies (such as Road Traffic Authority) current