桥梁与其它类型线路过渡段车辆气动特性及优化措施

发布时间：2018-06-03 03:47

本文选题：高速列车 + 过渡段　；参考：《西南交通大学》2017年硕士论文

【摘要】：横风环境下,桥梁与隧道、路堑以及路堤的轨道上方风场分布有所不同,高速列车在桥梁上运行与在隧道、路堑和路堤上运行时气动特性有一定差异,影响行车安全。当列车通过桥隧过渡段、桥堑过渡段和桥堤过渡段时,列车气动力必定有所变化。首先建立了桥隧、桥堑和桥堤过渡段模型,采用动网格技术来模拟列车通过过渡段的全过程,并将数值仿真模拟结果与风洞试验对比,验证了本文模拟方法的可靠性。计算了车速为250km/h时5种不同风速下列车通过桥隧、桥堑和桥堤三种过渡段时列车的气动特性;风速25m/s时列车以5种不同车速通过桥隧、桥堑和桥堤三种过渡段时列车的气动特性。研究了不同风速和车速下头车、中间车和尾车横向力和升力的变化规律,得到了列车通过各过渡段时气动力的最值。考虑在桥梁两侧增加风屏障的方式来优化列车通过各过渡段时气动力,对比了增加风屏障前后列车横向力和升力的变化。研究结果表明:列车经过不同过渡段时气动力差异较大,在列车经过各过渡段时头车、中间车和尾车气动力变化规律也不尽相同。风速对各节车横向力和升力影响较大,而车速对其影响相对较小。头车和中间车的气动力随风速和车速变化规律明显,尾车气动力随风速和车速变化规律较为复杂。在桥梁两侧增加风屏障后列车通过过渡段时各节车横向力和升力变化幅值有所减小,增加风屏障能有效优化列车经过过渡段时气动力。
[Abstract]:Under the crosswind environment, the wind field distribution over the track of bridge and tunnel, cutting and embankment is different, and the aerodynamic characteristics of high-speed train running on bridge and tunnel, cutting and embankment are different, which affects the safety of driving. When the train passes through the bridge and tunnel transition section, the bridge cut transition section and the bridge embankment transition section, the train aerodynamic force is bound to change. First, the model of bridge, tunnel, cut and embankment is established, and the whole process of train passing through transition section is simulated by using dynamic grid technology. The numerical simulation results are compared with the wind tunnel test to verify the reliability of the simulation method in this paper. The aerodynamic characteristics of trains passing through bridge and tunnel, bridge cutting and bridge embankment under five different wind speeds are calculated when the speed is 250km/h, and the train passes through bridge and tunnel with five different speeds when the speed of 25m/s is 25m/s. Aerodynamic characteristics of train in three transition sections of bridge cutting and bridge embankment. The variation law of transverse force and lift force of head car, middle car and tail car under different wind speed and speed are studied, and the maximum value of aerodynamic force when the train passes through each transition section is obtained. Considering the way of increasing wind barrier on both sides of bridge to optimize the aerodynamic force of train passing through each transition section, the variation of lateral force and lift force of train before and after the increase of wind barrier is compared. The results show that there is a great difference in aerodynamic force when the train passes through different transition sections, and the aerodynamic variation law of the first, middle and rear cars is also different when the train passes through each transition section. Wind speed has great influence on lateral force and lift force, while speed has little effect on it. The change of aerodynamic force with wind speed and speed is obvious, while that of tail car with wind speed and speed is more complex. When the train passes through the transition section, the variation amplitude of transverse force and lift force of each segment decreases after increasing the wind barrier on both sides of the bridge. The increase of the wind barrier can effectively optimize the aerodynamic force of the train passing through the transition section.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.7;U270.11

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