摘要
针对单层、腔室型两种形式的开孔波纹板风障,采用滑移网格方法分别模拟横风条件下高速列车通过风障区域的过程,分析了在横风和列车风耦合作用下风障周围的绕流流场特性、风障面板气动荷载的时域特性及横风与列车风耦合脉动压力的频域特性。结果表明:在高速列车行经风障区域的过程中,无横风时头车产生的冲击作用要大于尾车的;存在横风作用时,列车头车产生的气动冲击作用与横风作用形成对冲,抵消了部分横风能量,而列车尾车则与横风作用相叠加,放大了横风对风障的气动作用;单层风障通过改变横风流向起到挡风减载作用,而腔室型风障同时可在腔室内部及尾流形成大量小漩涡来消耗横风能量,使用腔室风障能显著降低单个风障面板的气动荷载;该研究中,横风与列车风耦合作用于风障的脉动压力以及气动荷载的主频谱峰值集中在0.5~5 Hz内。
The sliding mesh method was used to simulate the process of high speed trains passing through a windbreak region under cross wind. The single layer type and chamber type porous and corrugated plate windbreaks were used. The characteristics of flow field around train and windbreaks, time domain characteristics of windbreaks 'aerodynamic load and frequency domain characteristics of fluctuating pressure caused by coupling between cross wind and high speed train wind were analyzed. The results showed that when there is no cross-wind,the train head car's impacting action is stronger than that of the tripper car be; when there is a cross wind,the head car's aerodynamic impacting action offsets cross-wind to dissipate its energy,while the tripper car's aerodynamic impacting action is coupled with cross-wind to amplify cross wind 's aerodynamic impacting action against windbreaks; the single layer windbreak weakens crosswind's action through changing its direction,while the chamber windbreak produces a large number of small vortexes inside chamber and wake flow to dissipate cross-wind's energy and it obviously reduces aerodynamic load of a single windbreak plate.
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第3期153-159,166,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51278032)
国家重点研发计划课题(2016YFC0802206)
关键词
横风
高速列车
滑移网格
风障
气动荷载
cross wind
high speed train
sliding mesh
windbreak
aerodynamic load
