Aerodynamic Load Study On The High-Speed Railway Tunnel

When high-speed train enters the tunnel, aerodynamic responses will be caused, and air pressure wave will be produced, which can be regarded as an aerodynamic load applied on tunnel lining structure and all kinds of device in tunnel, and affect the structure's fatigue durability. By using the theory of aerodynamics and the soft of FLUENT of hydrokinetics, three aspects of the aerodynamic load in high-speed railway tunnel is studied systemically and deeply.The characteristic of aerodynamic field of high-speed railway. Several examples is studied to compare the pressure air in tunnel in two different conditions, and the result shows that even if a train has been off tunnel for some time, its influence on air pressure wave still exits.The three-dimensional effect of air pressure wave in high-speed railway tunnel. The paper adopts three-dimensional unsteady viscous compressible non-homentropic flow model, Three-dimensional numerical simulation on the air pressure change in the high-speed railway tunnel is carried. The numerical results show that the difference among the pressure values of different points at the same cross-section exists, the pressure change in tunnel is three-dimensional.The aerodynamic fatigue load spectrum in high-speed railway tunnel. Based on the theory of spectrum analysis, the research method of aerodynamic fatigue load spectrum is explained, Take the temporal curve of High-speed railway air pressure fluctuation which calculated by numerical simulation as a dynamic signal, converted into corresponding frequency-domine curve through Fourier transform, to research the features of the aerodynamic fatigue load spectrum. the main factors affecting on aerodynamic fatigue load spectrum, including its rule of change is found by calculating and comparing two conditions, which offered a base for studying the fatigue durability of lining structure and all kinds of device in high-speed railway tunnel.