单、双层客车车辆在铁路桥梁上的横向气动力特性

来源期刊：中南大学学报(自然科学版)2001年第4期

论文作者：祝志文 陈政清

文章页码：410 - 413

关键词：YZ₂₂型车辆;双层客车车辆;横向风;简支梁桥;风荷载

Key words：YZ₂₂vehicle; double-deck vehicle; crosswind; freebeam bridge; wind loads

摘    要：基于二维不可压缩流假设,采用k-ε湍流模型,对横向风中不同来流攻角作用下的YZ₂₂型车辆单体和双层客车车辆单体,以及前者在16 m,后者在24 m预应力混凝土“T”形简支梁桥上的多种工况模型绕流进行了数值模拟,分别得到YZ₂₂型车辆和双层客车车辆在16 m和24 m预应力混凝土“T”形简支梁桥上气动三分力系数.研究结果表明:在横向风作用下,YZ₂₂型车辆和双层客车车辆的气动三分力系数与各自单独存在时的相比明显增大;计算YZ₂₂型车辆和双层客车车辆在16 m和24 m预应力混凝土“T”形简支梁桥上所受的横向风荷载时,应重视铁路桥梁对其运行的影响;YZ₂₂型车辆的横向气动稳定性优于双层客车车辆.

Abstract: Based on the incompressible flowfield in two dimensionswithk-εturbulence model, the aerodynamic characteristics of YZ₂₂ vehicle and double-deck vehicle, the former on the 16 m railway free-beam bridge, and the later on 24m railway free-beam bridge in cross-wind, are simulated. It is found that the aerodynamic coefficients of both YZ₂₂ and the double-deck vehicles are too much larger than those of the two vehicle staying without railroad bridges. It is also shown that the aerodynamic characteristics of the YZ₂₂ vehicle is better than that of the double-deck vehicle when both passing on the 16 m and 24 m railroad freebeam bridges respectively.