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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)  
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.
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