大型复杂地下洞室群通风特性研究

Research on Ventilation Characteristics of Large⁃Scale Complicated Underground Cavern Group

地下洞室群施工作业面多,结构复杂,施工中会产生爆破气体、施工机械尾气、混凝土作业粉尘等。为解决地下洞室群内的通风布置优化问题,基于RNG k-ε湍流模型采用CFD软件对绩溪抽水蓄能电站地下洞室群的施工期通风进行数值模拟,研究地下洞室群内的实际通风效果以及入口风机风速对洞室内通风流场的影响。结果表明:现有通风方案下,洞室群内气流控制合理,主厂房与主变洞内均能形成下部送风、顶部排风,实现洞内空气的置换;当入口风机风速为20 m/s时,洞内流场分布均匀,空气流动速度适中,通风效果良好。

The underground cavern group has many construction work surface and complex structure,which will generate blasting gas,con⁃struction machinery exhaust gas,concrete operation dust during construction.In order to optimize the ventilation layout in underground cav⁃erns,based on the RNG k-εturbulence model,CFD software was used to simulate the actual ventilation performance and study the effect of the different velocity of the inlet fan on the flow field in Jixi Pumped Storage Power Station.The research results show that the wind flow con⁃trol is reasonable and the replacement flow is formed in the main powerhouse and the main transformed cavern,which is that the fresh air is supplied from the bottom and the polluted air is exhausted from the top.The flow field in the caverns is evenly distributed and the flow rate is moderate when the velocity of the inlet fan is 20 m/s.