高速列车明线交会气动性能与流线型长度关系研究.doc

本科毕业设计(论文) GRADUATION DESIGN(THESIS) 题 目： 高速列车明线交会气动性能与流线型长度关系研究 学生姓名： 指导教师： 学 院： 交通运输工程学院 专业班级： 交通设备1103班 本科生院制 2015年6月  高速列车明线交会气动性能与流线型长度关系研究 摘要 高速列车交会时产生的压力波及所受气动力对列车运行安全和旅客的乘坐舒适性均有重要影响。为保证交会时列车的安全，需对影响列车交会的各因素进行研究。其中，合理设置外形参数是保证列车交会安全性的关键因素之一。本文对不同流线型长度的列车明线交会时的气动性能进行分析研究，并得出两者间的关系。交会两车在外形相同、速度大小相同的情况下，流线型长度由8m增加到12m的过程中，列车气动性能参数变化如下：（1）最大交会压力波幅值由1291Pa减小到911Pa，减小了380Pa，减幅达29.4%；（2）横向力幅值由43.82kN减小到35.27kN，减小8.55kN，减幅约19.5%；（3）升力幅值由13.59kN减小到11.56kN，减小2.03kN，减幅约14.9%；（4）倾覆力矩幅值由75.20 kN?m减小到61.82 kN?m，减小13.38 kN?m，减幅约17.8%。随着流线型长度的增加，高速列车交会压力波幅值呈对数减小，横向力、升力、倾覆力矩等气动力和力矩的幅值也呈对数减小。因此，增加流线型长度，有利于改善高速列车明线交会时的气动性能。 关键词：高速列车 流线型长度 交会压力波 气动力 he relationship between aerodynamic performance of high-speed trains crossing on open tracks and streamline length ABSTRACT When high-speed train crossing, the pressure wave generated and aerodynamic force have an important effect on the safety and stability of train operations and the passenger ride comfort. It is necessary to conduct a study on the factors which have an impact on high-speed trains crossing.It is one of the key factors of ensuring the safety of train crossing to set up reasonable outline parameters. Now we conduct a study on the relationship between aerodynamic performance of high-speed trains crossing on open tracks and streamline length.The outline and velocity of both trains is same with each other. When streamline length increases from 8 m to 12 m, the train aerodynamic performance parameters are changing as follows: (1) The amplitude of maximum crossing pressure pulse decreases from 1291Pa to 911Pa by the decrement ratio about 29.4%, 380Pa decreased;（2）The amplitude of transverse force decreases from 1291Pa to 911Pa by the decrement ratio about 29.4%, 380Pa decreased; (3) The amplitude of lift force decreases from 13.59kN to 11.56kN by the decrement ratio about 14.9%, 2.03kN decreased; (4) The capsizing moment amplitude decreases from 75.20 kN?m to 61.82 kN?m by the decrement ratio about 17.8%,