地铁开式通风系统喷嘴送风研究

Study on the Blowing Performances of Nozzles under the Open Ventilation System

地铁开式通风系统事故时风机联动范围大,时滞长,可靠性和及时性较差,主要针对地铁开式通风系统喷嘴送风进行研究。采用Fluent数值模拟方法,从送风角度、布置位置对顶置和侧置喷嘴进行了优化,获得了顶置和侧置喷嘴最佳布置形式。对两种喷嘴形式下隧道风机进行了选型计算。最后采用SES对区间隧道火灾喷嘴送风风机动作模式进行模拟,结果表明,通过喷嘴送风,可减小风机动作数量,通过动作事故区间相邻车站的隧道风机即可满足区间风速要求,系统可靠性和及时性大大提高。

The more fans should be actioned and the more time would be spent when the train accident was occurred in the subway tunnel under the open ventilation system, which means poor reliability and timeliness. In this paper, the blowing performances of nozzles in the open ventilation system have been studied. The optimal arrangements of the nozzle have been acquired through optimization design from angles of airflow and layout of nozzle by numerical simulation. The volume and pressure of tunnel fan have also been calculated for two kinds of nozzles. In the last, the operation modes of tunnel fan have been simulated when the train accident was occurred in the tunnel under the open ventilation system by SES. The result showed that only a small number of fans need be actioned when the train accident was occurred in the tunnel which means good reliability and timeliness.