A mechanical ventilation system plays a major role in tunnels safety. Over the world, different ventilation systems regarding to the tunnel geometry and other parameters are used for tunnel ventilation in the normal and fire operations. The main concern is a proper smoke evacuation in a fire case. In this paper, we are studying the mechanical ventilation system in underground tunnel below Suez Canal-Egypt that were simulated using Fire Dynamic Simulator (FDS) version 6.2.0, and it shows an acceptable agreement with experimental data. The studied parameters included the temperature variation along tunnel length, and the variation in temperature at different crosssections and heights and velocity variation with time at different heights and crosssections in order to assess the effectiveness of various ventilation scenarios at fire accidents within the tunnel. The results have been presented and analyzed to simulate an actual fire test in some locations inside the tunnel. Three case studies simulated with different Heat Release Rate(HRR)of Heptane pool with 29MW, which equivalent to bus or truck fire, 67MW which is equivalent to plastic cups goods vehicles fire (HGV)and 119 MW which equivalent trailer with 8.5 ton furniture, fixtures and rubber tires [1]. The fire location is fixed at 105 m from tunnel entrance. Results illustrate the temperature contours and velocity contours at different cross sections at human level. This study shows that temperature at human level doesn't exceed 40 C.
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