| Because of China’s geographical environment is complex,a large population,the EMU and the general speed train intersection on the existing speed line is widespread,the EMU and the general speed train are difference in the length,width,and height of the body,the head shape and the operation speed,the aerodynamic pressure characteristics of the intersection between the EMU and the general speed train are different from that of the same speed and model.With the operation speed of the EMU and the general speed train increased on the existing speed line will lead to the intersection aerodynamic pressure increased significantly between the two trains,especially in the tunnel crossing conditions,superposition of the tunneling effect and the crossing pressure will lead to the change of the intersection aerodynamic pressure is more intense and complex between the two trains.Therefore,the effect of pressure wave on the body and the window of the two train’s crossing side,the ride comfort of passengers in the train and the stability of two trains are increased significantly,in particular,the general speed train had less design of the air tightness and air tightness and other issues in the previous,there are potential risks.The main works of this paper are:based on the theory of the computational fluid mechanics and the finite volume method,simulated the flow with three-dimensional,transient,compressible,viscous and turbulent of line intersection and tunnel intersection between the EMU and the general speed train and general speed train through the double track railway tunnel single.The surface pressure of the EMU and the general speed train under three kinds of working conditions are extracted,and the surface pressure characteristics and its distribution on the train surface are obtained.According to the numerical results,the window strength of crossing in the two conditions of the EMU and the general speed train were analyzed from three aspects such as static strength of window glass,dynamic impact strength of window glass and the strength of the installation structure.The work of this paper provides a reference for the safety and comfort design of the EMU and the general speed train,and provides a basis for the aerodynamic problems of the EMU and the general speed train.The calculation results show that whether intersection on line or in tunnel,the pressure fluctuation of the EMU and the general speed train on intersection side surface was strong,the rest of the side surface pressure fluctuation was weak.Both of them first got a positive and a negative pressure impact,then got a negative and a positive pressure impact during the rendezvous process.The value of the pressure fluctuation of EMU and general speed train on each position of intersection side surface was different,but the variation of pressure fluctuation with time was basically the same.During the process of intersection on line,the maximum pressure amplitude of the general speed train surface happen to the intersecting place of the same height of EMU nose and the transition of the driver’s room and auxiliary room,the maximum pressure amplitude of the EMU happen to the intersecting place of the same height of the general speed train bottom and head train shoulder position.During the process of intersection in tunnel,the four sides of the EMU was mainly affected by negative pressure,and the four side of the general speed train was affected larger positive pressure several times,the maximum pressure of the EMU and the general speed train surface pressure values were in the process of crossing tunnel intersection.The whole process of running in tunnel the surface pressure fluctuation times of the EMU and the general speed train was different,along the different length of the respective surface of the two trains’ body,the pressure fluctuation times was different,the pressure fluctuation on intersection side surface of the EMU and the common speed train was stronger than that of the non intersecting surface.When the window glass strength of the EMU and the general speed train was sufficient,the greater the aspect ratio of the window,the greater the strength of the installation structure,the wider the installation structure,the greater the installation strength. |
