摘要
建立长路堑路段高速动车组运行模型,通过数值模拟得到不同工况下动车组气动力,分析强横风环境下路堑结构对动车组气动特性的影响.研究表明:不同路堑结构中气动阻力均随风速和车速增大而增大,深路堑中动车组气动阻力约为浅路堑的2~2.5倍;在3m深度的浅路堑结构中,动车组所受升力为正值,升力和横向力均随横风风速增大而增大;而在10m深度的深路堑结构中,动车组所受升力为负值,升力随横风风速增大而增大,横向力随风速增大而减小;分析车速对气动力的影响:在浅路堑结构中,除阻力外,列车车速对其他气动力影响较小;在深路堑中,动车组气动力大小均随车速增大而增大,在相同风速条件下,当风速高于15m/s时,车速每增大50km/h,横向力和倾覆力矩增大约50%.
A high-speed EMUs operating model in a long cutting sections was established, and the aerodynamic forces of the EMUs under different working conditions were obtained by numerical simulation methods. The influence of aerodynamic characteristics of the EMUs on the cutting structures under strong cross winds is analyzed. The research result shows that the aerodynamic drags in different cutting structures is increased with the wind speed and vehicle speed, and the aerodynamic drags of the EMUs in deep cutings is about 2-2.5 times that of the shallow cuttings. In the shallow cutting structures with a depth of 3 meters, the aerodynamic lifts of the EMUs is positive, and the lifts and lateral forces are increased with the wind speed of the cross wind. However, in the deep cutting structures with a depth of 10 meters, the lifts of the EMUs is negative and the lifts is increased with the wind speed of the cross wind and the lateral forces decrease as the wind speed increases. In the shallow cutting structures, except for the drags, the train speed has little influences on other aerodynamic forces. In the deep cuttings, all of the aerodynamic forces of the train are increased with the increase of the vehicle speed. Under the same wind speed conditions with a wind speed higher than 15m/s, the lateral forces and tilting moments are increased by approximately 50% with the vehicle speed increase of each 50 km/h.
作者
宋阳阳
杜礼明
SONG Yangyang;DU Liming(School of Locomotive and Ralling Stock Engineering,Dalian Jiaotong University,Dalian 116028,China)
出处
《大连交通大学学报》
CAS
2019年第3期55-60,共6页
Journal of Dalian Jiaotong University
基金
辽宁省自然科学基金资助项目(201602112)
关键词
大风区
路堑
动车组
气动特性
数值模拟
wind area
cutting
EMUs
aerodynamic characteristics
numerical simulation
