Wind Tunnel Experimental Investigations on Icing Characteristics of Bogies of High-speed Trains
The alpine and snowy environment causes massive snow accumulation in the bogie regions,which seriously endangers the running safety of high-speed trains.To analyze the icing characteristics of bogies under the alpine and snowy weather,an experimental investigation on the icing of high-speed train bogies is conducted in the Icing-snowing Wind Tunnel(ISWT)of Central South University(CSU),using a scaled model containing a simplified train body and a motor bogie.A water-spray system is used to simulate the water-spraying phenomenon generated by the melt water around the brake calipers to reproduce the process of bogie icing due to water spraying from the wheels.The dynamic icing process and the overall icing distribution characteristics of the bogie regions,the ice mass weighting of each key region of the bogie and the icing rate model of the bogie are studied.The results show that the droplets thrown out by the wheels are spread to all regions of the bogie under the effect of the turbulent flow field,which generated icing at low temperatures and developed rapidly with time until the whole bogie region is covered with ice.For the bogie cabin,its rear end panel is seriously iced,and the icing mass accounts for 28％of the total icing mass of the bogie cabin;for the bogie,the frame and brake caliper regions have the highest ice distribution,accounting for 34％and 22％of the total icing mass of the bogie,respectively,while the ice distribution in the air spring,cross beam,and longitudinal beam is less.The bogie presents the characteristics of a large icing mass and a complex icing shape at the bottom.With the increase of icing time,the icing rate of each region is different,and the overall icing mass of the bogie cabin and bogie is a linear function of icing time.The bogie icing distribution characteristics and icing rate model obtained from the study can provide a reference basis for the rapid prediction of bogie icing mass within a certain operation time,which is of great significance to the safe operation of high-speed trains in alpine and snowy environments and bogie anti-icing/deicing.
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