Abstract: In order to study the fire smoke control effect of indoor commercial pedestrian street, taking an urban complex as an example, simulate the fire of indoor commercial pedestrian street, set a 1.5 MW alcohol fire source in the atrium, start the smoke exhaust facilities and manually start the natural smoke exhaust facilities respectively after ignition, observe the smoke spread in the indoor pedestrian street under two working conditions, and measure the temperature and other parameters in the test area. It was found that compared with the natural smoke exhaust at the top, under the mechanical smoke exhaust condition, the smoke settlement rate is 17% lower, the height of the smoke layer is 11% higher, the temperature field in the smoke plume is basically the same, the average temperature is about 61 ℃, the temperature of the top smoke layer is 4.7% higher, and the horizontal spread rate of the smoke is 41.6% faster under the suction of the fan.

Key words: indoor pedestrian street; hot smoke test; mechanical smoke exhaust; natural smoke exhaust