铁道科学与工程学报2025，Vol.22Issue(3)：954-966,13.DOI:10.19713/j.cnki.43-1423/u.T20240794
风屏障端部附近交会的背风侧列车气动效应
Aerodynamic effects of leeward side train meeting near end of wind barrier
摘要
Abstract
When high-speed trains meet on a bridge in a crosswind environment,the windward side train has a wind-shielding effect,which is superimposed with transient pressure waves generated during the meeting,resulting in a sudden change in the aerodynamic load of the leeward side train.When the meeting occurs near the end of the bridge wind barrier with high wind speed and turbulent airflow,the aerodynamic performance of the leeward side train is bound to deteriorate further,impacting its safe and smooth operation.To study the aerodynamic effects of the leeward train when high-speed trains meet near the end of the bridge wind barrier under crosswind,based on the improved delayed detached eddy simulation method,CFD models of the curved wind barrier,high-speed train,and bridge were established.The influence of different meeting starting positions of high-speed trains near the end of the bridge wind barrier on the aerodynamic pressure at the meeting surface measurement points and the aerodynamic load coefficients of the leeward train were explored,and its flow field characteristics were analyzed.On this basis,a coupled dynamic model of the vehicle-rail-bridge system was established.The change laws in the safety indicators of the leeward side train when high-speed trains meet on a bridge without wind barrier and near the end of the bridge wind barrier were compared and studied.The research results show that when high-speed trains meet near the end of the bridge wind barrier,the aerodynamic performance of the head car of the leeward side train is significantly affected by the starting position of the meeting.Compared with the situation of meeting on a bridge without wind barrier,when the starting position of the meeting is located 0.5L away from its end outside the wind barrier area(L is the length of the head car),the amplitude of the normal wave and the full wave at the measurement point 1 of the leeward side train increase by 22.75%and 18.31%,respectively.The peak values of the lateral force,lift,and overturning moment coefficients of the head car of the leeward side train increase by 13.08%,11.39%,and 9.76%,respectively,and the corresponding amplitudes increase by 16.16%,13.31%,and 25.12%.At the same time,during the meeting process near the end of the wind barrier,the maximum values of the wheel load reduction rate and derailment coefficient of the head car of the leeward side train increased by 6.33%and 4.14%,respectively,resulting in a decrease in its driving safety.The research results can provide a reference for further ensuring the safe and stable operation of high-speed trains on bridges in strong wind regions.关键词
高速列车交会/风屏障端部/气动荷载/数值模拟/气动效应Key words
high-speed trains meeting/end of wind barrier/aerodynamic load/numerical simulation/aerodynamic effect分类
交通运输引用本文复制引用
陶玮,娄平,孙震..风屏障端部附近交会的背风侧列车气动效应[J].铁道科学与工程学报,2025,22(3):954-966,13.基金项目
中国国家铁路集团有限公司科技研究开发计划项目(L2021G002) （L2021G002）
