Simulation and study on different ventilation modes for closed underground railway vehicle service workshop

Taking a closed underground railway vehicle service workshop as an object, simulates the air flow in the service workshop using the CFD technique. Analyses and compares the simulation results (mainly two ventilation effectiveness evaluation indexes including the air velocity distribution and the average air age distribution within adult mens breathing area) to determine the ventilation efficiency of five different ventilation modes. The results show that in the traditional air duct ventilation mode, the mechanical ventilation can significantly improve the indoor ventilation effect instead of natural ventilation. In the traditional air duct ventilation mode, the mechanical ventilation effect of bottom air inlet is worse than that of upper air inlet due to the impact of parked vehicles. The advantage of ventilation effect of induction fan mode is very obvious compared with the traditional air duct ventilation mode and the daily operation is very flexible.