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水下隧道排烟阀尺寸对侧向排烟系统烟气蔓延特性影响

Journal of Safety and Environment(2023)

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Abstract
为探究水下隧道侧向排烟阀尺寸对烟气蔓延特性的影响,依托苏震桃高速公路太湖隧道工程,采用理论分析与FDS数值模拟等方法,对水下隧道侧向排烟系统烟气蔓延特性展开分析.结果表明:随着排烟量的增加,侧向排烟阀变得越狭长,烟气控制效果越好,侧向排烟系统的排烟效率越高;随着排烟量的增大,每个排烟阀处的局部阻力损失有明显增加;并且随着排烟阀变得越来越狭长,排烟阀处局部阻力损失越小,最大能降低原有损失的15.6%.提出了排烟阀局部阻力与无量纲排烟量与无量纲排烟阀尺寸之间的拟合关系式.结合排烟效率分析结果,建议排烟阀尺寸(宽x高)选取 4 m×1.5 m.
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Key words
safety engineering,tunnel fire,exhaust vent size,smoke exhaust efficiency,smoke layer,local resistance
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