某多匝道城市地下道路纵向排烟系统运行优化

Operation optimization of longitudinal smoke control system in urban underground traffic tunnel with multiple ramps

为研究多出入匝道的存在对隧道纵向排烟系统效率的影响,采用通风网络对某多匝道城市地下道路分段纵向排烟系统的烟气控制效果进行了模拟分析,得到了不同火灾场景中风机运行的最佳策略。结果表明,对于该城市地下道路而言,火灾发生时各段排烟风机不必全部运行即可达到所要求的临界风速值,火源段下游竖井附近风机需逆转运行才能防止竖井上游烟气向下游扩散,从而提高其排烟效率;若主线隧道发生火灾,匝道风机最好停止运行,以帮助主线隧道达到较好得控烟效果。

To study the effects of ramps on the efficiency of longitudinal smoke control systemin urban traffic tunnel,a tunnel ventilation network model is established. The smoke control effects indifferent fire scenarios are studied by the numerical method,and the most optimal ventilation strategy in each scenario isobtained. The results show that the critical wind velocity can be reached without all designed fans running,and the fans at the downward of the ventilation shaft need to run reversely to obtain high exhaust efficiency. The longitudinal smoke control system in the main tunnel and the smoke control systems in the ramp should run in combination for high efficiency in smoke control.