基于高速列车转向架区域边界优化的防积雪研究OA

In order to enhance the snow accumulation resistance of the bogie region of high-speed trains operating in extremely cold and snow-rich environments.A coupled URANS-DPM numerical approach utilizing Realizable k-ε model for continuous phase turbulence modeling were employed to analyze the airflow field characteristics,snow particle trajectories,and snow accumulation patterns in the bogie region under three different endplate configurations.It included the original model(Scheme 1)with inclined endplates installed at both the front and rear ends,an optimized model(Scheme 2)featuring a vertical endplate combined with a downward-sloping deflector at the front end and an inclined endplate at the rear end,and another optimized model(Scheme 3)with vertical endplates combined with downward-sloping deflectors installed at both the front and rear ends.Simultaneously,the accuracy and adaptability of the numerical simulation method were systematically validated through wind tunnel tests on the clean airflow field,two-phase flow,and snow-ice conditions in the bogie region.The research findings are drawn as follows.Compared to the original inclined endplate configuration,adopting a vertical endplate combined with a downward-sloping deflector at the front end(Scheme 2)can significantly reduce the positive pressure distribution on the surfaces of bogie components,and lower the amount of snow particles adhering to the bogie surfaces by 71.11%.When vertical endplates combined with downward-sloping deflectors are installed at both the front and rear ends(Scheme 3),the number of snow particles entering the bogie region from the front can be effectively reduced,and the amount of snow particles adhering to the bogie surfaces can be decreased by 67.94%.However,this configuration may generate turbulent airflow at the rear,leading to increased snow and ice accumulation,with a 26.24%increase in snow particle adhesion on the rear deflector.The configuration with vertical endplates combined with downward-sloping deflectors at both the front and rear ends(Scheme 3)is clearly unsuitable for the frequent directional changes encountered during high-speed train operations.It is recommended to adopt the configuration with a vertical endplate combined with a downward-sloping deflector at the front end and an inclined endplate at the rear end(Scheme 2),and to fabricate a retractable and adaptive vertical deflector device to achieve bidirectional control over snow and ice accumulation in the bogie region.