Experimental study on smoke transportation from a narrow-long hallway to the remote room through doors of different sizes

The reduced scale experimental apparatus was applied to study smoke transportation mechanism. Based on the series of tests conducted on the reduced scale apparatus, smoke transportation from the narrow-long hallway to the remote room was systematically analyzed. The two ends of the hallway were blocked and the smoke could only be exhausted naturally from the remote room. The experimental results show that the size of the opening between the hallway and the remote room has a great effect on the smoke hazard in the remote room. The smoke concentration at the same height sampling point presents an oscillation tendency at a very low level in case of smaller opening size, while it will rise rapidly in a way of multiplication and oscillation decay with the increment of the opening size. Meanwhile, it was found that the smoke concentration at the sampling point in the remote room is higher than in a room close to the fire-origin room in a given period.