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不同类型头部外形列车轨侧压力变化规律分析与评估
作者:谢台中 刘堂红 陈争卫 李文辉 陈晓栋 周细赛 
单位:中南大学 交通运输工程学院,湖南 长沙 410075
关键词:列车明线运行 头部外形 阻力 轨侧压力 
分类号:
出版年·卷·期(页码):2019·41·第2期(41-49)
摘要:

采用计算流体力学方法,在对鼓宽形、椭球形、梭形、扁宽形4种类型狗万要实名制头部外形列车明线运行阻力及基本气动性能分析的基础上,对轨侧压力随不同曲面形式和空间位置的变化规律进行研究。结果表明:4种类型列车速度为250 km/h明线运行时鼓宽形列车阻力最大,梭形最小,最大相差7.4%;鼓宽形列车引起的轨侧压力变化峰峰值最大,其次是椭球形、梭形,扁宽形最小,最大相差24.4%;纵剖面形线对轨侧压力变化的影响大于水平剖面形线,如不同纵剖面形式的鼓宽形和扁宽形列车引起距轨面1.5 m位置测点压力变化分别为721.62545.71 Pa,相差24.4%,而不同水平剖面形式的鼓宽形和椭球形列车引起相同测点的压力变化分别为721.62700.44 Pa,仅相差2.9%4种曲面形式列车引起的轨侧压力变化均随距轨面高度、轨道中心线横向距离的增加而减小,规定测点压力变化峰-峰值均满足EN标准中小于800 Pa的要求。

By using the method of computational fluid dynamics,based on the analysis of basic aerodynamics(such as aerodynamic drag) of trains with four different head surface forms running in open air including bulge-wide,ellipsoid,spindle,and flat-wide types,the research was conducted on the variation of trackside pressure with the change of spatial locations and head surface forms.The results show that when the four types of trains runat 250 km/h in open air,the bulge-wide type has the largest aerodynamic drag,while the spindle type has the smallest aerodynamic drag,witha maximum difference of 7.4%.The maximum peak to peak value of trackside pressure is induced by the bulge-wide type,followed by the ellipsoid and the spindle types,while the flat-wide type is minimal,with a maximum difference of 24.4%.The influence of the longitudinal profile on the variation of trackside pressure is greater than the horizontal profile.The pressure variation induced by the different longitudinal profiles of bulge-wide and flat-wide type above 1.5 m from the top of railis 721.62 Pa and 545.71 Pa respectively,with a difference of 24.4%.The pressure variation induced by different horizontal profiles of the bulge-wide and the ellipsoid type at the same measuring point is 721.62 Pa and 700.44 Pa respectively,with a difference of only 2.9%.The trackside pressure changes induced by the four different head surface forms are reduced with the increase of the height above the top of rail and the lateral distance from the center of the track.The peak to peak value of the measured point pressure variation is within the requirement of EN standard,which is 800 Pa.

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