Tunnel aerodynamics remains a pivotal area of research in high-speed railway and tunnel engineering.Whether the results from short formation tests could accurately reflect the distribution of pressure extremes within tunnels has been one of the main concerns for scholars at home and abroad.This paper derives a quantitative relationship between the distribution of positive and negative pressure extremes on the tunnel wall and the length of the train formation and the tunnel pressure waves,based on the principle of pressure wave superposition.The theoretical deductions are verified by the numerical simulation results of different train formations with a speed of 300 km passing through a 2,088 m-long tunnel and different train formations with a speed of 350 km passing through a 1,000 m-long tunnel.The results of the study show that the length of train formation and Mach number have a significant effect on the longitudinal distribution of positive and negative pressure extremes in the tunnel,especially in locations where the positive and negative pressure occur.When the tunnel length fulfills specific criteria,the extreme values of positive and negative pressure of a target train passing through the tunnel can be estimated from the corresponding values obtained when a short train passes through the tunnel,and the formula for calculating the tunnel length is correlated with train length and Mach number.
关键词
隧道/高速列车/列车编组长度/压力波/气动荷载/马赫数
Key words
Tunnel/High-speed train/Length of train formation/Pressure wave/Aerodynamic load/Mach number
维普
万方数据