多匝道隧道纵向排烟分区划分与风机匹配计算

为解决多匝道隧道纵向排烟设计的难点,按照隧道结构特点和交通流方向将其拆解为合流、分流单元2种分岔结构,提出排烟分区划分原则与划分方法;通过压力平衡和流量平衡原理确定各分支风机开启方向、相邻排烟分区风机的协同关系与风机升压力选型范围,进而给出可行的射流风机匹配方案;针对多种火源位置,通过数值模拟验证方案的合理性。结果表明:所提出的方法对不同位置火灾的纵向排烟有较好的适应性;并且,通过所提出方法获得的多套射流风机匹配方案可达到相近的排烟效果。

Longitudinal smoke exhaust zone division and fan matching calculation for multi-ramp tunnel

In order to solve design difficulties in longitudinal smoke evacuation of multi-ramp tunnels,it was disassembled into two types of forked structures,merging and splitting,according to tunnel structural characteristics and traffic flow direction,and division principle and method of smoke evacuation zones were proposed.Then,action orientation,cooperative relationship and select range of fans of adjacent zones were determined,and feasible jet fan matching schemes were presented based on theories of pressure balance and mass balance.Finally,rationality of these schemes was verified through numerical simulations for multiple fire locations.The results show that the proposed method has good adaptability for longitudinal smoke evacuation design of different fire locations.Moreover,multiple jet fan schemes obtained from it could achieve similar smoke exhaust effects.