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Effect of cross passage on aerodynamic characteristics of super-high-speed evacuated tube transportation
https://orcid.org/0000-0001-7937-9081
Abstract Based on 3- D, unsteady compressible Navier-Stokes equations and SST k-ω two-equation IDDES turbulence model, the effect of cross passage on aerodynamic characteristics of evacuated tube transportation is simulated by overset mesh technology. The flow structure, aerodynamic force and aerothermal environment in three train/tube configurations are studied. The results show that there is a linear relationship between the length of the disturbed region of normal shock wave and running time. Cross passage can reduce both aerodynamic drag and aerothermal environment in the case of a single train passing. The transport channel and diffusion channel are formed to transport the air from tube A (B) to tube B (A). However, the lateral force fluctuates greatly. After the train leaves the cross passage, the lateral force coefficient periodically decays and oscillates. While, in the case of two train crossing, the existence of the cross passage could aggravate pressure field and aerothermal environment in the tube. Besides, the aerodynamic drag coefficient fluctuates during the intersection of two trains and the lateral force coefficient of the train fluctuates greatly and the maximum lateral force coefficient of two trains crossing is 2.86 times that of a single train passing.
Highlights The overset mesh technology could simulate the train running in the tube. There is a linear relationship between the length of the disturbed region and time. Cross passage reduces both aerodynamic drag and heating in single train case. Transport and diffusion channels are formed to transport air in single train case. Cross passage aggravates aerodynamic performance in two trains crossing case.
Effect of cross passage on aerodynamic characteristics of super-high-speed evacuated tube transportation
https://orcid.org/0000-0001-7937-9081
Abstract Based on 3- D, unsteady compressible Navier-Stokes equations and SST k-ω two-equation IDDES turbulence model, the effect of cross passage on aerodynamic characteristics of evacuated tube transportation is simulated by overset mesh technology. The flow structure, aerodynamic force and aerothermal environment in three train/tube configurations are studied. The results show that there is a linear relationship between the length of the disturbed region of normal shock wave and running time. Cross passage can reduce both aerodynamic drag and aerothermal environment in the case of a single train passing. The transport channel and diffusion channel are formed to transport the air from tube A (B) to tube B (A). However, the lateral force fluctuates greatly. After the train leaves the cross passage, the lateral force coefficient periodically decays and oscillates. While, in the case of two train crossing, the existence of the cross passage could aggravate pressure field and aerothermal environment in the tube. Besides, the aerodynamic drag coefficient fluctuates during the intersection of two trains and the lateral force coefficient of the train fluctuates greatly and the maximum lateral force coefficient of two trains crossing is 2.86 times that of a single train passing.
Highlights The overset mesh technology could simulate the train running in the tube. There is a linear relationship between the length of the disturbed region and time. Cross passage reduces both aerodynamic drag and heating in single train case. Transport and diffusion channels are formed to transport air in single train case. Cross passage aggravates aerodynamic performance in two trains crossing case.
Effect of cross passage on aerodynamic characteristics of super-high-speed evacuated tube transportation
https://orcid.org/0000-0001-7937-9081
Abstract Based on 3- D, unsteady compressible Navier-Stokes equations and SST k-ω two-equation IDDES turbulence model, the effect of cross passage on aerodynamic characteristics of evacuated tube transportation is simulated by overset mesh technology. The flow structure, aerodynamic force and aerothermal environment in three train/tube configurations are studied. The results show that there is a linear relationship between the length of the disturbed region of normal shock wave and running time. Cross passage can reduce both aerodynamic drag and aerothermal environment in the case of a single train passing. The transport channel and diffusion channel are formed to transport the air from tube A (B) to tube B (A). However, the lateral force fluctuates greatly. After the train leaves the cross passage, the lateral force coefficient periodically decays and oscillates. While, in the case of two train crossing, the existence of the cross passage could aggravate pressure field and aerothermal environment in the tube. Besides, the aerodynamic drag coefficient fluctuates during the intersection of two trains and the lateral force coefficient of the train fluctuates greatly and the maximum lateral force coefficient of two trains crossing is 2.86 times that of a single train passing.
Highlights The overset mesh technology could simulate the train running in the tube. There is a linear relationship between the length of the disturbed region and time. Cross passage reduces both aerodynamic drag and heating in single train case. Transport and diffusion channels are formed to transport air in single train case. Cross passage aggravates aerodynamic performance in two trains crossing case.
Effect of cross passage on aerodynamic characteristics of super-high-speed evacuated tube transportation
Hu, Xiao (author) / Deng, Zigang (author) / Zhang, Weihua (author)
2021-02-10
Article (Journal)
Electronic Resource
English
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