A Study of the Influence of Aerodynamic Forceson a Human Body near a High-Speed Train

摘要

A study of the influence of aerodynamic force on human body near thehigh-speed train was completed by the means of the technology of moving grids incomputational fluid dynamics method. 60 running situations, which includes 3types of locomotive shape, 4 running speeds of train combining 5 distances fromhuman body to the sidewall of the train (human-train distances), were simulated.The 4 running speeds are 200km/h, 250km/h, 300km/h and 3501cm/h. The 5 hu-man-train distances are 1.0m, 1.5m, 2.0m, 2.5m and 3.5m. The study results showthat the aerodynamic force acting on human body strongly affected by the shapeof the passing train head. The aerodynamic force produced at 1.0m human-traindistance by extremely blunt train head at 350km/h speed is 7 times more than thatproduced by a streamline train head at the same operating condition. With an in-crease of human-train distance, the differences among the aerodynamic forcesproduced by the different shape of train head decreases. The decrease is about aquadratic function of the human-train distance, and has nothing to do with trainspeed. The ratio of the maximum aerodynamic force produced by train head andthat produced by train tail at a given human-train distance is about a constant andindependent of train speed. The ratio of the maximum aerodynamic forces for anytwo different human-train distances produced by train head or train tail is about aconstant and has nothing to do with train speed. The direction of the aerodynamicforce acting on the human body is nearly the same in different running conditionsindependent of train head/tail shape. The direction of the aerodynamic forcechanges over 300 degrees when train head or train tail passes. Based on the calcu-lation results, formulas for calculating the aerodynamic force acting on the humanbody and the maximum wind speed near the human body were presented. Safetydistances for people walking or working near passing train were recommended.