电梯上行对加压前室的防烟效果影响

为了确定火灾中电梯运行时的活塞效应对加压前室的影响,利用数值模拟方法,以一座10层的高层建筑电梯井及前室为例,模拟火灾中低速电梯运行对前室不同加压送风量产生的压力波动。加压送风量采用常用工程计算公式得出。模拟研究结果表明,电梯井处压力受加压送风量影响较明显,且在电梯上行运动时,轿厢周围及尾端的漩涡会对电梯经过层的前室压力带来一定的波动影响;对于研究的低速电梯,其运行时对前室的压力波动较小,在一定程度上不会对前室的加压防烟效果造成明显的影响。

Effect of upward elevator on smoke prevention in pressurized lobby

In this paper, the Fluent software is used to study on the validity of smoke control for the lobby in a 10-story building when an elevator with a low speed moves up. The objective of this paper is to investigate the piston effect of moving elevator in fire and its influence on the lobby. The pressurized air supply is calculated using engineering formulas. The simulation results show that the pressure at the elevator shaft is affected by the pressurized air supply. The vortex around the car and at the end of the elevator when the elevator moves upwards causes certain fluctuations to the pressure in the elevator lobby. For the low-speed elevator studied in this paper, the anterior chamber during operation has small pressure fluctuations, which will not obviously affect the anti-smoking effect of the lobby.