Influence of new airbag structure on aerodynamic performance of high-speed train in crosswind
In order to guarantee the safety of high-speed trains under crosswind,a new type of airbag structure installed on the leeward side of the train was proposed to improve the crosswind aerodynamic performance of the train.Based on a three car high-speed train,four different train-airbag models were established,i.e.,train with airbag(Model Ⅰ),increasing the lateral width of the airbag(Models Ⅱ and Ⅲ),and increasing the vertical width of the airbag(Model Ⅳ).Based on three-dimensional steady SST k-ω,two-equation turbulence model,the crosswind aerodynamic performance of high-speed trains in different airbag models were analyzed.The results show that the airbags on the leeward side of the train change the pressure distribution on the surface of the leeward side of the train,resulting in a decrease in the lateral force coefficient and an increase in the lift coefficient of the train,leading to a decrease in the overturning moment coefficient of the train and a significant improvement in the crosswind aerodynamic performance of high-speed trains.As the lateral width of the airbag increases,the lateral force coefficient of the train gradually decreases,while the lift coefficient gradually increases.Compared with the original train model,model Ⅲ has better crosswind aerodynamic performance,with a decrease of 7.09％in lateral force coefficient and an increase of 12.78％in lift coefficient,while models Ⅰ,Ⅱ,and Ⅲ reduce the overturning moment coefficient of high-speed trains by 8.43％,11.05％,and 13.15％,respectively.Changing the vertical width of the airbag has little effect on the crosswind aerodynamic characteristics of high-speed trains.Model Ⅳ can reduce the overturning moment coefficient of the high-speed train by 8.78％,which is similar to the optimization effect of Model Ⅰ.
国家科技期刊平台
NSTL
万方数据
