Effect of flexible ribbon length on aerodynamic drag of Ahmed model
In order to reduce the aerodynamic drag of the vehicle during driving,the Ahmed body model with a tail angle of 25° was taken as the research object.The control method of adding different lengths of flexible ribbons to the lower edge of the vertical plane of the tail was proposed.The fluid-solid coupling calculation method combining lattice Boltzmann method and finite element analysis was used to explore the influence of the length of the flexible ribbon on the aerodynamic drag of the vehicle.Firstly,the air resistance coefficient of the model was obtained by optimizing the lattice scale of the vehicle model.Then,the influence of the flexible ribbon on the aerodynamic drag of the vehicle was studied.Finally,the tail flow field of the model,the flow field near the flexible ribbon and the pressure coefficient of the tail surface of the model was analyzed.The simulation results show that adding a flexible ribbon of appropriate length to the tail of the model improves the wake structure,increases the pressure on the tail surface,and reduces the differential pressure resistance of the vehicle body.The maximum drag reduction rate is 12.25%.
Ahmed modelpassive controlflexible ribbonaerodynamic dragnumerical simulation
NETL
NSTL
万方数据
