【摘要】 为评估均匀送风与射流风机这2种通风设置对公路隧道火灾疏散模拟结果的影响，采用FDS数值模拟方法，在相同几何尺寸、火源条件以及4种典型平均断面风速下构建隧道模型，分别施加2种通风设置，研究两者隧道流场特征与疏散环境的差异。研究结果表明：低能见度区域垂直厚度沿通风方向的变化趋势，在射流风机设置时为递增，均匀送风设置时则为递减。射流风机设置时，局部高速气流对烟气的扰动导致断面风速越大，能见度反而越低，但均匀送风设置时不存在此规律。相较射流风机设置，均匀送风设置对温度安全性预测较准确，但对能见度安全性高估显著。研究结果可为FDS数值模拟中通风设置的合理选择及疏散环境安全评估提供参考。更多还原

【Abstract】 In order to evaluate how two ventilation configurations, namely uniform air supply and jet fans, affect evacuation simulation outcomes in highway tunnel fires, this study conducts numerical simulations using FDS.A tunnel model is built under the same geometry and fire source conditions, and under four typical mean cross-sectional air velocities.The two ventilation configurations are applied separately to examine the differences in tunnel flow-field characteristics and evacuation conditions.The results show that the variation trend of the vertical thickness of the low-visibility zone along the ventilation direction increases under the jet-fan configuration, whereas it decreases under the uniform air-supply configuration.Under the jet-fan configuration, disturbances induced by local high-speed jets lead to a counterintuitive effect in which higher cross-sectional air velocity corresponds to lower visibility, while this pattern does not appear under the uniform air-supply configuration.Compared with the jet-fan configuration, the uniform air-supply configuration yields more accurate predictions of temperature-related safety, but it substantially overestimates visibility-related safety.These findings provide a reference for selecting appropriate ventilation configurations in FDS simulations and for assessing the safety of evacuation environments.更多还原