Research and optimization of airflow organization in passenger room of subway train

This article takes the air flow organization in the passenger compartment of a 120 km/h Type A subway train as the research object. Based on the two-dimensional and three-dimensional model diagrams of the train, a geometric model is established and mesh division is completed. Boundary conditions are set according to the calculation details of the heating and cooling load of the train air conditioning and the uniformity results of the air supply simulation in the air duct. Using computational fluid dynamics methods and simulation software such as HyperMesh and STAR-CCM+, the full load and empty load, summer and winter Simulation calculation of 8 operating conditions including single return air and double return air. The results show that the main flow velocity of all working conditions is below 0.6m/s, which does not cause a significant blowing sensation to passengers, but there is a problem of airflow short circuit; The uniformity of air flow organization and temperature distribution in the passenger compartment is good when unloaded; When fully loaded, the uniformity of air flow organization and temperature distribution in the passenger compartment decreases, and the temperature significantly increases; The dual return air mode with increased seat bottom return air can significantly improve the temperature distribution in the passenger compartment and enhance comfort.