铁路隧道防灾通风射流风机安装位置对通风效果的影响

Influence of Installation Position of Jet Fan on Ventilation Effect in Disaster Prevention Ventilation of Railway Tunnel

采用网络通风算法,确定铁路隧道紧急出口及隧道口救援站内防灾通风工况下的射流风机型号及数量;采用三维数值方法,研究紧急出口辅助坑道内及隧道口救援站平行导洞内射流风机安装位置对防灾通风效果的影响,提出射流风机安装位置与防护门及隧道口救援站最外侧联络通道之间的距离建议值。结果表明:对于单车道辅助坑道紧急出口,射流风机安装位置与防护门之间距离宜大于10.9倍辅助坑道断面当量直径;对于双车道辅助坑道紧急出口,射流风机安装位置与防护门之间距离宜大于7.4倍辅助坑道断面当量直径;对于隧道口救援站,平导内射流风机应安装于靠近平导出口侧,与最近横通道之间距离宜大于8.3倍平行导洞断面当量直径。

The network ventilation algorithm was used to determine the model and quantity of jet fans under disaster prevention ventilation conditions at the emergency exit of railway tunnel and the rescue station at tunnel entrance.The three-dimensional numerical method was used to study the influence of the installation position of jet fans on disaster prevention ventilation effect in the auxiliary tunnel at the emergency exit and the parallel pilot tunnel of the rescue station at tunnel entrance.The recommended values for the distances between the installation position of jet fans and the protective door and the outermost communication channel of the rescue station at tunnel entrance were proposed.Results show that for the emergency exit of the single-lane auxiliary tunnel,the distance between the installation position of jet fans and the protective door should be greater than 10.9 times the equivalent diameter of the auxiliary tunnel section.For the emergency exit of the two-lane auxiliary tunnel,the distance between the installation position of jet fans and the protective door should be more than 7.4 times the equivalent diameter of the auxiliary tunnel section.For the rescue station at tunnel entrance,the jet fans should be installed on the side close to the exit of parallel pilot tunnel,and the distance between the installation position of jet fans and the nearest cross channel should be greater than 8.3 times the equivalent diameter of the parallel pilot tunnel section.