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Effect of underbody guide plate forms on aerodynamic drag of high-speed train

CHEN Yu;GAO Zhe;WANG Yigang;YANG Zhigang;Shanghai Automotive Wind Tunnel Center,Tongji University;  
To reduce the aerodynamic drag of high-speed train,the high-speed train models with four different forms of underbody guide plates in the front and rear of bogies are designed,which are straight,oblique,inner arc and outer arc. The numerical simulation method is verified by wind tunnel test,and the aerodynamic drag and underbody flow field of high-speed train influenced by guide plates are analyzed by numerical calculation. The results indicate that,the maximum difference of aerodynamic drag affected by underbody guide plates is up to 20%,and the maximum difference of peak aerodynamic drag of head car is 0. 062. The underbody guide plates affect the underbody flow velocity and the pressure distribution of bogie section,and the guide effect leads to simultaneous change of the aerodynamic drag of the bogie section and the drag of bogie. The better guide effect of the guide plates in the front and rear of bogies,the smaller aerodynamic drag of bogie section. Meanwhile,the stagnation pressure on bogies increases by the air flow impact. There is a lower total drag force of the high-speed train under the effect of guide plates and the air flow impact. It is shown that it is better to use the straight form underbody to reduce theaerodynamic drag of the whole train.
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