Simulation of smoke flow and mechanical smoke extraction of busbar floor for main workshop of underground hydropower station

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.