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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第1期    总第45期    2012年2月

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文章编号:1672-7029(2012)01-0101-06
兰新铁路现有土堤式挡风墙局部加高优化
刘珍1,2,张健1,2,杨明智1,2,吴雪峰1,2

(1.轨道交通安全教育部重点实验室( 中南大学) ,湖南长沙410075;
2.中南大学交通运输工程学院,湖南长沙410075
)

摘 要: 随着兰新线上通过列车速度的提高,现有土堤式防风墙的防护效果亟需改善,考虑在原有挡风墙顶部进行局部加高改造。基于三维定常、不可压N-S 方程与κ-ε 双方程湍流模型,采用棚车为代表车型,在横风风速为50 m/s 时,分别对不同加高高度的对称和非对称土堤式挡风墙条件下运行速度为120 km/h 的货物列车所受气动力进行了数值模拟,以车辆倾覆力矩为考核指标分析挡风墙加高高度对棚车气动性能的影响。研究结果表明,在现有土堤式挡风墙顶部局部加高能有效地提高其对列车的防风作用; 其对称土堤式挡风墙合理加高高度为0.28 m,迎风侧高度1 m 和2 m 的非对称土堤式挡风墙合理加高高度分别为0.62 和0.49 m。结果为工程实际应用提供了理论依据。

 

关键字: 土堤式挡风墙; 气动力; 倾覆力矩; 加高高度

The partial raises optimization of existed earth type wind barrier in Lanxin Railway
LIU Zhen1,2,ZHANG Jian1,2,YANG Ming-zhi1,2,WU Xue-feng1,2

1.Key Laboratory of Traffic Safety on Track ( Central South University) ,Ministry of Education,Changsha 410075,China;
2.School of Traffic & Transportation Engineering,Central South University,Changsha 410075,China

Abstract:Along with the rise of train speed,the protection effect of earth type wind barrier needs to be improved.The method of further heightening the top of the original wind barrier was considered.Based on three dimensional steady,uncompressible N-S equations and standard κ-ε equations,and using box car as the representative model,when the crosswind speed is 50 m/s and the train speed is 120 km/h,the aerodynamic forces of box car running behind symmetrical and un-symmetrical earth type wind barriers with different increase height were simulated.The overturning moment was used as evaluation index to analyze the influence of increased height on aerodynamic performance of the box car.The result proves that partially heightening the top of earth type wind barrier can effectively improve its protection effect.The reasonable increasing height of symmetrical earth type wind barrier is 0.28 m.For un-symmetrical type,the reasonable increasing height is 0.62 m when its windward side height is 1m,and the reasonable increasing height is 0.49 m when its windward side height is 2 m.Therefore,the results provide the theoretical basis for the engineering practical application.

 

Key words: earth type wind barrier; aerodynamic force; overturning moment; increase height

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
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