速度为400km/h的高速列车风对沿线受风构件的气动力效应研究OA

With the operational velocity of high-speed railways approaching 400 km/h,the aerodynamic effects induced by train-induced winds on wind-loaded structures along railway lines have become increasingly significant.Based on CFD numerical simulation,the three-dimensional model of a train and wind-loaded structures was established.The reliability of the numerical model and the equivalent aerodynamic force method was validated by field measurements and high-speed railway design codes.The influence of train speed and train-to-structure distance on aerodynamic effects was investigated.Based on simulation results,a formula for aerodynamic forces of 400 km/h trains was derived and validated against standard curves.The results show that the equivalent integration method along the component length has minimal error and is applicable to 400 km/h speed scenarios.The head wave peak pressure is increased by 30.69%and 71.92%when the train speed is raised from 350 km/h to 400 km/h and 450 km/h,respectively.Conversely,the peak pressure is reduced by 83.34%when the distance is increased from 2.5 m to 7.5 m.The aerodynamic force is observed to be proportional to the square of the speed and inversely proportional to the 1.5 power of the distance.The aerodynamic force on wind-exposed components of a train traveling at 400 km/h can be determined by qh=ρv2k0Ds-1.5.The fitted aerodynamic force curve shows the same trend as the standard code,with an error within 10%.These findings establish critical references for wind-resistant design optimization of railway-side components in 400 km/h high-speed railway systems.