不同侧滑角对高速列车-翼板气动特性影响OA

To improve the operational safety of high-speed trains in strong wind environments,this paper proposed an aerodynamic flow control strategy involving the installation of winglets on the leeward side of the train,aiming to explore the control effect and adaptability of this strategy under different yaw angles.Combining the speed limit standards for high-speed railways and the characteristics of typical wind field environments,four yaw angles(8.8°,13.5°,24.2°,and 42.0°)were selected.A combined model of high-speed train and winglets was constructed.Numerical simulation methods were used to study the aerodynamic response of the train.The influence mechanism of the winglets on the flow field structure around the train,lateral aerodynamic forces,and overturning moments was analyzed,as well as their role in enhancing the anti-overturning performance of the train under different yaw angles.The research shows that the winglets can significantly improve the low-pressure large-scale vortex structure on the leeward side,optimize the flow field distribution,induce small-scale vortices,accelerate energy dissipation,make the pressure distribution on the leeward side more uniform,and significantly reduce the transverse pressure gradient.Meanwhile,the coupling effect of the accelerated flow on the roof and the decelerated flow at the bottom of the train generates lift with its point of action towards the leeward side of the train,forming an anti-overturning moment.Under the selected yaw angles,the lateral force of the train is reduced by 14.0%,20.8%,23.3%,and 25.3%respectively.The overturning moment is reduced by 21.8%,32.5%,34.5%,and 34.4%respectively.Although an increase in the yaw angle intensifies the development of the vortex structure on the leeward side,forming an unstable region with higher energy and larger scale,it also provides more space for energy dissipation,making the control effect of the winglets more significant under large yaw angles.Despite differences in the improvement range under different yaw angles,the winglets overall exhibit good engineering adaptability and the ability to enhance anti-overturning performance.The flow control technology based on winglet can effectively enhance the wind resistance performance of trains.The results can provide an important basis for the aerodynamic shape design of high-speed trains,the arrangement of crosswind-resistant structures,and the control of operational safety.