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为研究水下公路隧道纵向疏散通道加压送风系统的关键设计参数,结合纵向疏散通道的特点,借鉴一般建筑加压送风系统的设计要求,提出了纵向疏散通道内加压送风量的计算方法,并通过数值模拟方法对纵向疏散通道加压送风系统进行了研究。结果表明,利用风速法计算得到的送风量比压差法计算得到的结果大20倍左右,并且压差法计算送风量时受疏散口缝隙宽度影响较大,工程适用性差。通过数值模拟可知,疏散通道内的送风风速达到1.5m/s时即能够满足人员安全疏散要求,这与风速法计算的结果一致。研究结果可供采用纵向疏散模式的隧道疏散通道加压送风系统设计参考。
In order to study the key design parameters of pressurized evacuation system of vertical evacuation corridor of underwater tunnel and combined with the characteristics of vertical evacuation corridor and the design requirements of general building pressurized air supply system, The calculation method and the numerical simulation method were used to study the pressurized ventilation system of longitudinal evacuation passageway. The results show that the air flow rate calculated by the wind speed method is about 20 times larger than that calculated by the pressure difference method, and the pressure difference method is affected by the gap width of the evacuation port when the air volume is calculated. Therefore, the engineering applicability is poor. Through numerical simulation, it can be seen that the evacuation passage within the air supply velocity of 1.5m / s to meet the evacuation requirements of personnel safety, which is consistent with the results of wind speed method. The research results are available for design of pressurized air supply system of tunnel evacuation passage adopting longitudinal evacuation mode.