Aerodynamic design of lifting wing for high-speed trains
This study explored the potential and aerodynamic conditions for the application of lift wing technology in next-generation high-speed trains.It aimed to clarify the optimal aerodynamic structure of lift wing airfoils and the critical technical parameters of their operational postures.The research proposed a design method for integrating lift wings with the body of the train under the constraints of high-speed railway limits.It focused on the aerodynamic design of lift wings,their operational attitudes,and installation arrangements.The findings indicate that compared to flat-convex and swept flat-convex lift wings,skewed flat-convex lift wings exhibit superior overall lift enhancement,drag reduction characteristics,flow field effects,and compatibility with the streamlined shapes of the train roofs.The lift coefficient is 1.15,achieving an aerodynamic lift of 19.08 kN at a speed of 450 km/h,where the aerodynamic drag constitutes only 32.7%of the lift.The aerodynamic forces on the lift wings relate quadratically with the angle of attack,peaking at an angle of approximately 18°,where aerodynamic efficiency reaches up to 135%.At a speed of 450 km/h,configured per single train car set,the generated aerodynamic lift surpasses 10%of the maximum vertical axle load of the standard Chinese high-speed train unit,demonstrating excellent lift enhancement characteristics.Considering the railway limits,airfoil geometrical parameters,and spatial layout of equipment on the train roof,the preferred lift height for lift wings operates within a range of 400～800 mm.As the lift height decreases,the aerodynamic drag remains nearly constant,but the effective lift enhancement significantly improves.The development of lift wing technology for high-speed trains represents an effective measure for achieving higher speeds in next-generation wheel-rail and maglev trains through drag reduction and energy savings.It holds promising application prospects,with future focus recommended on the integrated synergistic control in various operational states of high-speed lift wing trains and safety issues under adverse wind conditions.
万方数据
维普
