Research on the influence of moving boundary conditions on flow characteristics inside the test section of the ice-snow wind tunnel
The phenomenon of snow and ice accumulation in the bogie area of rail trains is an important issue related to the stability and safety of train operation.To solve such problem in the bogie area,a wind tunnel for snow and ice accumulation on the train bogie was developed to study the flow field characteristics of the original scale model bogie area.Based on the SST k-ω IDDES turbulence model,the flow characteristics of the wind tunnel test section under different moving boundary conditions were analyzed,and the adaptability and deviation of the flow field simulation under the existing moving boundary conditions of the ice snow wind tunnel were explored.Through the gird independence verification and the flow field calibration,it was verified that the numerical method was confirmed to simulate the flow field of the ice snow wind tunnel.The research results show that the flow field characteristics under boundary conditions of moving ground and rotating wheelsets in the real operating environment cannot be approximately simulated by stationary ground and stationary wheelsets.The maximum of average velocity above the rail surface is 5 times larger than that in real operating environment,and the actual boundary in wind tunnel for stationary ground and rotating wheelsets is closer to the real boundary.The average negative pressure behind the bogie under the stationary ground and stationary wheelsets is higher than that under other cases.The average negative pressure deviation of the rear end plate surface of the car body and the bogie surface is large,while the average negative pressure deviation of the surface under the stationary ground and rotating wheelsets case is 9%comparing to the real operating environment,and the surface deviation of the bogie wheel set is 15%.The turbulence intensity in the bogie area under different cases has little difference,the turbulence intensity in the front area of the bogie is relatively large under the stationary ground and wheelsets.Therefore,under different boundary conditions,the stationary ground and rotating wheelset in test section of the ice snow wind tunnel can better simulate the flow field characteristics in the bogie area under the actual operation state,laying a foundation for the subsequent test research on the flow field characters and the snow and ice issue in the bogie area.
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