长大隧道洞口风道式通风相关问题数值模拟研究
Numerical simulation research on related problems of tunnel ventilation at entrance of long and large tunnels
摘要：
对于长大铁路隧道洞口紧急救援站，采用隧道洞口风道式的通风方式，避免了将风机直接暴露在隧道内，降低了由于风机运行给隧道运营带来的风险。以某长大隧道为例，利用CFD数值模拟对洞口风道式通风相关问题展开研究，得到洞口风道双侧送风具有较好的通风效果。进一步对双侧送风的研究表明，风道间距为2倍隧道正洞当量直径时，隧道洞口送风速度较大、速度不均匀系数较小。
Abstract：
For the emergency rescue station at the entrance of the long and large railway tunnel, adopts the tunnel entrance ventilation method to avoid the direct exposure of the fan in the tunnel and reduce the risk of tunnel operation due to the operation of the fan. Taking a long and large tunnel as an example, studies the related problems of tunnel ventilation by using CFD numerical simulation, and obtains that the double-sided air supply of the tunnel entrance has a better ventilation effect. Further studies the double-sided air supply, and the results show that when the air duct spacing is twice the equivalent diameter of the main tunnel, the air supply velocity at the tunnel entrance is larger and the velocity nonuniformity coefficient is smaller.
Keywords:railway,longandlargetunnel,ductventilation,numericalsimulation,mechanicalpressurizedsmokeprevention