地铁区间隧道列车火灾烟气特性及控制策略的数值模拟研究
首发时间:2015-11-04
摘要:采用数值模拟方法对一内径为5.5m圆形盾构地铁区间隧道列车火灾工况进行研究,通过计算火源功率分别为5MW、7.5MW、10MW下隧道内烟气的温度分布,分析了不同工况顶部最高温度值以及出现位置的变化。针对实际排烟风机需延迟启动的情况,研究了延迟启动时间因素对隧道内烟气温度分布的影响。结果表明隧道顶部最高温度随火源功率增大而增高。临界排烟风速会造成烟气温度最高点的偏离火源位置,但随着火源功率增加,排烟的影响会逐渐减弱。延迟启动风机会破坏烟气层的稳定性导致烟气沉降到停靠列车的车厢位置会影响乘客安全疏散。
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Numerical simulation research on the smoke propagati on mechanism and control method for fires in subway tunnel
Abstract:Numerical simulation is used to investigate fire scenarios in a circular shield subway tunnel with inner diameter of 5.5m. Temperature fields and the position of maximum temperature in this subway tunnel are calculated for fire with heat release rate of 5MW, 7.5MW and 10MW respectively. In addition, the effect of delay start time of exhaust fan on smoke propagation is considered. Results show that that the maximum smoke temperature under ceiling is larger with the increase in heat release rate of fire. The critical wind velocity has a weaker influence on the maximum temperature field with the increase of fire load. Delay starting of exhaust fan would damage the stability of smoke layer. Smoke layer would descend to the train carriage and the temperature of air near train would become high. This effect is harmful to passenger safety evacuation.?????
Keywords: Subway Tunnel Fire Temperature field Smoke
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地铁区间隧道列车火灾烟气特性及控制策略的数值模拟研究
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