Influence of the Aerodynamic Force to Human Body near High-Speed Trains

A study on the influence of aerodynamic force to human body and of train wind near high-speed train was done by means of the technology of moving grids in computational fluid dynamics method.The calculating situations included 3 types of locomotive shape,4 running speeds of train, from 200 to 350 km·h-1,5 distances,from 1.0 to 3.5 m,between train and human body.Formulas for calculating the aerodynamic force acted on the human body and for calculating the maximum wind speed near the human body were presented.Safety distances for people walking or action near passing train were recommended.Calculation result shows that the aerodynamic forces acted on human body vary greatly when different head shapes of trains pass.The blunter the shape of train head(tail) is,the larger the aerodynamic force acted on human body will be produced by train wind.The aerodynamic force produced by extremely blunt train head at 350 km·h-1 speed and 1.0 m human-train distance is more than 7 times of that produced byperfect streamline train head under same operation condition.With the increase of human-train distance,the differences among the aerodynamic forces produced by different types of train head decrease.The decrease quantity is about quadratic function of the human-train distance.Change tendency of the direction of aerodynamic force acted on the human body is nearly the same under different running conditions.The direction angle of the aerodynamic force changes about 300°when train head or train tail passes.