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Numerical Simulation and Analysis of Critical Velocity in Tunnel Fires Based on FDS

机译：基于FDS的隧道火灾临界速度的数值模拟与分析

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摘要

Critical velocity is a very important parameter in smoke control of tunnel fires and the variation of critical velocity against fire heat release rate is also one of the most important issues in tunnel fire researches. In this paper, a simplified physical model of a tunnel was established and the predictions of critical velocity for fire sizes in the 5-100MW range were carried out by FDS simulations. The FDS-predicted dimensionless critical velocities were compared with the values calculated by Wu and Bakar's model. The result indicated that when the heat release rate was relatively small, Q≤30MW, the critical velocity increased with the increasing of heat release rate and varied as the one-third power of the heat release rate; when Q≥40MW, the growth rate of critical velocity became very small; after Q reach to 60MW, the critical velocity was almost unchanged with the increasing of heat release rate. In addition, the values of critical velocity calculated by Wu and Bakar' model which was derived from small-scale gas fire tests were underestimated. Therefore, the model suggested by Wu and Bakar is not suitable for critical velocity prediction in tunnel fires.
机译：临界速度是隧道火灾烟雾控制中的一个非常重要的参数，并且对火热释放率的临界速度的变化也是隧道火灾研究中最重要的问题之一。本文建立了一种隧道的简化物理模型，通过FDS模拟进行了5-100MW范围内的火灾尺寸的临界速度的预测。将FDS预测的无量纲临界速度与由吴和巴卡尔的模型计算的值进行比较。结果表明，当热释放速率相对较小时，q≤30mw时，临界速度随着热释放速率的增加而增加，随着热释放速率的三分之一功率而变化;当Q≥40mW时，临界速度的增长率变得非常小;在Q达到60mW之后，随着热释放速率的增加几乎不变。此外，吴和巴卡尔型号衍生自小型气体火灾试验的临界速度值的值被低估了。因此，Wu和Bakar建议的模型不适合隧道火灾中的临界速度预测。

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