Aerodynamic drag reduction design of high-speed train with vortex generator installed on front hatch
Aiming to reduce the aerodynamic resistance during train operation,the Reynolds time-averaged(RANS)method based on the shear stress transport(SST)k-ω turbulence model was used to study the influence of vortex generators installed on the front hatch of high-speed train tail car on the flow characteristics of train wake flow and the aerodynamic loads.The results show that the vortex generator can significantly change the flow field around the tail car and produce a pair of counter-rotating vortices opposite to the original vortices in the wake flow,which can weaken the basic wake vortices.Compared with the prototype,the airflow is hindered by the vortex generator,contributing to a large positive pressure area on the surface of the tail car,which reduces the aerodynamic pressure drag and lift of the tail car.As the installation position of the vortex generator is close to the nose tip of the tail car,the aerodynamic lift reduction effect gradually decreases,and the maximum lift reduction rate of the tail car is 36.8%.The drag of the tail car decreases firstly and then increases with the backward movement of the vortex generator,which can reduce the aerodynamic drag of the tail car by up to 4.54%.The proper vortex generator installed on the front hatch can effectively control the wake structure,and thus improve the aerodynamic force of the tail car,which provides a new thought for aerodynamic drag reduction of high-speed trains.
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