涡流发生器对高速磁浮列车气动特性影响研究OA

High-speed maglev trains operating at 600 km/h generate significant aerodynamic lift and drag,which leads to increased energy consumption and safety concerns.Therefore,it is necessary to conduct research on drag reduction and lift suppression for high-speed maglev trains.The aerodynamic characteristics of a high-speed maglev train were investigated by using the three-dimensional compressible Navier-Stokes equations and the SST k-ω turbulence model.The effects of vortex generators placed on both sides of the train's rear car on the flow field were analyzed under different train speeds and vortex generator deflection angles.The results show that vortex generators can successfully increase the positive pressure region at the nose of the rear car,improving both aerodynamic drag and lift.As the deflection angle increases from 0° to 25°,the aerodynamic lift reduction effect progressively improves,while the drag reduction effect first increases and then decreases.The maximum drag reduction rate is 1.47%,and the lift reduction is 7.66%,when the deflection angle is 10.It is the most effective configuration.At a deflection angle of 20°,the aerodynamic lift at the rear car is reduced by as much as 20.82%.Although larger deflection angles improve the positive pressure area at the rear,their increased windward area can lead to a significant decrease in drag reduction effectiveness.In the speed range from 400 km/h to 600 km/h,the effect of vortex generators on drag reduction and lift suppression remained consistent with the trend observed in different deflection angles.The best drag reduction effect is achieved at a deflection angle of 10°,with larger deflection angles providing better lift reduction.However,as the speed increased,the rates of drag and lift reduction can gradually decrease.Vortex generators can effectively reduce drag and lift for maglev trains,but their deflection angle should be adjusted based on the actual aerodynamic control needs at different speeds.The findings can provide a reference for aerodynamic control in high-speed maglev trains.