强侧风下城际动车组非定常气动特性研究  

Study on the unsteady aerodynamic characteristics of a intercity emu under strong crosswind

作　　者：李玉坤 周丹[1] LI Yukun;ZHOU Dan(Key Laboratory of Traffic Safety on Track,Ministry of Education,Central South University,Changsha 410075,China)

机构地区：[1]中南大学轨道交通安全教育部重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2018年第11期2721-2729,共9页Journal of Railway Science and Engineering

基　　金：国家科技支撑计划资助项目(2015BAG12B01-24)

摘　　要：通过分离涡模拟(DES)数值计算方法,对强侧风中不同行驶工况下某新型城际动车组的非定常气动特性进行研究,计算得到各工况下该型城际动车组所受非定常气动力的时域特性、频域特性,以及列车周围的非定常流场结构。研究结果表明:在强侧风作用下,列车所受气动力存在明显的非定常性,随着路堤高度的增加,非定常性更加显著;非定常气动载荷的主要频率出现在0～50 Hz,峰值频率主要出现在0～8 Hz,应考虑气动载荷频率与车身固有频率接近而可能造成的共振问题;随着路堤高度的增加,转向架和风挡区域流场扰动更加剧烈。The detached-eddy simulation(DES)method is used to study the unsteady aerodynamic characteristics of a new type intercity EMU of different driving conditions,the time and frequency domain characteristics of the unsteady aerodynamic forces of the intercity EMU of different driving conditions are obtained,what’s more,the structures of the flow field around the train are acquired.The results indicate that the aerodynamic forces of the train under strong crosswind have significant unsteady characteristics,with the increase of the embankment height,the unsteady characteristics become more significant;the main frequencies of the unsteady aerodynamic characteristics are between 0 and 50 Hz while the peak frequencies are between 0 and 8 Hz,thus the resonance problem may caused due to the similarity of the aerodynamic characteristics frequencies and the natural frequencies of the train;with the increase of the embankment height,the disturbance of the flow field around the bogie and the windshield is becoming more intense.

关 键 词：强侧风 城际动车组 非定常 分离涡方法 

分 类 号：U270.1[机械工程—车辆工程]