Aerodynamic characteristics of moving vehicles of two trains passing each other on bridge under crosswinds

Abstract

Two trains passing each other is controlling factor for the wind-vehicle-bridge systems. To test the aerodynamic characteristics of moving vehicles under crosswinds when two trains are passing each other, a wind tunnel test device, which has two moving tracks, was developed. The rationality of the test result was discussed, the effects of intersection mode, yaw angle and lane spacing on the aerodynamic coefficients of the leeward train were analyzed, and the difference of aerodynamic coefficients between the head vehicle and the tail vehicle was discussed. The results show that the proposed test device has good repeatability. The intersection modes have a certain effect on the aerodynamic force of the leeward train when two trains are passing each other, and the results should be more reasonable during the two trains dynamic passing each other. With the decrease of yaw angle, the sudden change of train aerodynamic coefficients is more obvious. The decrease of lane spacing will increase the sudden change of leeward vehicles. In the process of two trains passing each other, the aerodynamic coefficients of the head vehicle and tail vehicle are significantly different, so the coupling vibration analysis of wind-vehicle-bridge system should be considered separately.

摘要

双车交会是风-车-桥耦合系统的控制因素。为测试在侧风作用下双车交会时列车的气动特性,研制了一种具有双条移动轨道的风洞试验装置。讨论了试验结果的合理性,分析了交会形式、偏航角和线间距对背风侧列车气动力的影响,并讨论了头车与尾车气动力系数的差异。实验结果表明,所提出的测试装置具有良好的重复性;双车交会时,交会方式对背风列车的气动力有一定的影响,动动交会时测试结果更加合理;随着偏航角的减小,列车气动系数的突变更为明显;线间距的减小会增加背风侧列车气动力的突变;列车交会过程中,头车与尾车的气动力系数存在较大差异,因此在进行风-车-桥耦合振动分析中应分开考虑。