The suspension gap is a critical operational parameter for high-speed maglev trains and significantly impacts their aerodynamic performance.Based on an engineering prototype of the high-temperature superconducting(HTS...The suspension gap is a critical operational parameter for high-speed maglev trains and significantly impacts their aerodynamic performance.Based on an engineering prototype of the high-temperature superconducting(HTS)pinning maglev train,this study established a detailed three-dimensional model,and then the aerodynamic characteristics of the HTS maglev train at 600 km/h with suspension gaps of 10 mm,20 mm,and 30 mm were simulated based on the improved delayed detached eddy simulation(IDDES)turbulence model and SST kωtwo-equation.The results demonstrated that the underbody design of the HTS maglev train leads to unique aerodynamic drag and aerothermal distribution phenomena.The head car experiences the smallest drag,while the tail car experiences the largest.The aerothermal temperature on the train's bottom surface progressively increases from the head to the tail.Additionally,the U-shaped track significantly constrains the flow around the train body,forming strong vortex structures.As the suspension gap increases from 10 mm to 30 mm,the airflow velocity in the train-track gap rises,reducing the underbody pressure and decreasing the lift of the head car by 12.43%.The drag of the head car increases by 10.98%,primarily due to changes in pressure drag.Additionally,the temperature at the underbody of the tail car rises further due to significant airflow deceleration.These findings provide valuable insights for advancing the engineering design and application of the high-speed HTS maglev technology.展开更多
基金Project(U24B20125)supported by the National Natural Science Foundation of ChinaProject(K2024T005)supported by the China National Railway Group Science and Technology Program。
文摘The suspension gap is a critical operational parameter for high-speed maglev trains and significantly impacts their aerodynamic performance.Based on an engineering prototype of the high-temperature superconducting(HTS)pinning maglev train,this study established a detailed three-dimensional model,and then the aerodynamic characteristics of the HTS maglev train at 600 km/h with suspension gaps of 10 mm,20 mm,and 30 mm were simulated based on the improved delayed detached eddy simulation(IDDES)turbulence model and SST kωtwo-equation.The results demonstrated that the underbody design of the HTS maglev train leads to unique aerodynamic drag and aerothermal distribution phenomena.The head car experiences the smallest drag,while the tail car experiences the largest.The aerothermal temperature on the train's bottom surface progressively increases from the head to the tail.Additionally,the U-shaped track significantly constrains the flow around the train body,forming strong vortex structures.As the suspension gap increases from 10 mm to 30 mm,the airflow velocity in the train-track gap rises,reducing the underbody pressure and decreasing the lift of the head car by 12.43%.The drag of the head car increases by 10.98%,primarily due to changes in pressure drag.Additionally,the temperature at the underbody of the tail car rises further due to significant airflow deceleration.These findings provide valuable insights for advancing the engineering design and application of the high-speed HTS maglev technology.
