Research on aerodynamic drag reduction of high-speed maglev train based on bionic shark fin structure
With the continuous increase of train speed,the aerodynamic drag increases sharply,which leads to high energy consumption,hindering energy-saving for rail transit. Based on the idea of bionics,a bionic shark fin structure installed on the tail of maglev train was proposed to reduce the aerodynamic drag of the train. The three-dimensional Realizable k− ε two-equation turbulence model was used to simulate the flow field and wake characteristics of the high-speed maglev train with or without shark fin structures,and the influence of structure parameters on the wake and aerodynamic resistance of the train was analyzed. The results show that the fin structure makes the train wake converge to the longitudinal center of the train,resulting in decrease in velocity and increase in pressure. Fin structure parameters have little effect on the aerodynamic resistance of the head and middle car,but significant effect on the tail car,especially on the pressure differential resistance of the tail car. When the front angle of a fin with smaller height,or the height of a fin with smaller front angle change,the aerodynamic effect is more significant on the tail car. The aerodynamic drag of the tail slowly decreases with the increase of fin heigh and front angle. In this study,when the fin height of the bionic shark is 300 mm and the front angle is 60°,the aerodynamic drag reduction effect is the best,the drag reduction rate of the tail car reaches 10.2％,and the drag reduction rate of the whole train is 4.3％. The research results can provide technical reference for the reduction of aerodynamic resistance and energy consumption of higher speed train.
maglev trainaerodynamic drag reductionbionic shark fin structurewakenumerical simulation
万方数据
维普
