Interference characteristics of front and rear wings of high-speed train with lift wing
The installation of the lift wing on the roof of a high-speed train aims to reduce the action force of wheel and rail by increasing the pneumatic lift of the train,which is a new equivalent weight loss method.After the lift wing is mounted on the top of the high-speed train,the working environment is very different from that of aviation,and there is mutual interference between lift wings.The 1:10 ratio of CRH high-speed train model was studied,and the improved delay separation vortex simulation(IDDES)method was used to conduct numerical simulation analysis of the two-wing high-speed train with different wing heights and different wing spacings.The effects of the wing layout on the air dynamics and the surrounding flow field structure around the train were discussed.The results show that for different spacing layout,when the rear wing is too close to the front wing,the flow velocity is increased,the pressure difference becomes smaller,and the aerodynamic lift is reduced.When the rear wing spacing is too large,the rear wing is far away from the interference range of the front wing wake,the rear wing cannot be subjected by the forward airflow under the front wing,so the lift force is reduced.For different height layout,the wake vortex of the front wing with the scattered layout is far away from the rear wing due to the height difference.Compared with the elevation layout,the front wing tail of the scattered layout causes less interference to the rear wing.In terms of aerodynamic force,the overall lift performance of the train with scattered layout is better than that of the equal height layout,and with the front low and rear high type layout,the increase effect of the train is the best.Based on the results of different spacings and different height layout,it is finally determined that for the two-wing high-speed trains,the aerodynamic performance of the whole vehicle with the front low and rear high layout with the wing spacing of 0.90H is optimal,especially the lift of the train can be significantly improved.
国家科技期刊平台
NSTL
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