Performs the simulation and the results show that when fire occurs near the headwall of the busbar floor, smoke tends to quickly flow to the turbine floor through the open holes for installment and the staircases, and the smaller space of busbar floor results in higher temperature, higher smoke concentration and lower visibility; the environment of high smoke concentration and low visibility is easier to form in the turbine space, while the temperature is lower; in the generator floor with larger space, the smoke concentration and temperature is lower, while the visibility is reduced to a rather low level in a certain time after fire due to air entrainment. Mechanical smoke extraction reduces smoke concentration and temperature in the generator floor effectively.%对地下水电站主厂房母线层端部火灾进行了模拟研究,结果表明:母线层端部发生火灾时,烟气通过吊物孔和楼梯间很容易到达水轮机层;母线层空间较狭小,易形成高温、高烟气浓度和低可见度;水轮机层空间也易形成高烟气浓度和低可见度,但温度较低;发电机层空间大,烟气浓度小,温度较低,但由于空气的卷吸,火灾发生一段时间后可见度很低.机械排烟能有效降低发电机层的烟气浓度和温度.
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