Effect of landform on aerodynamic performance of high-speed trains in cutting under cross wind

Abstract

The effects of the different landforms of the cutting leeward on the aerodynamic performance of high-speed trains were analyzed based on the three-dimensional, steady, and incompressible Navier-Stokes equation and k-ɛ double-equation turbulent model. Results show that aerodynamic forces increase with the cutting leeward slope decreasing. The maximum adding value of lateral force, lift force, and overturning moment are 147%, 44.3%, and 107%, respectively, when the slope varies from 0.67 to −0.67, and the changes in the cutting leeward landform have more effects on the aerodynamic performance when the train is running in the line No. 2 than in the line No. 1. The aerodynamic forces, except the resistance force, sharply increase with the slope depth decreasing. By comparing the circumstance of the cutting depth H= −8 m with that of H=8 m, the resistance force, lateral force, lift force, and overturning moment increase by 26.0%, 251%, 67.3% and 177%, respectively. With the wind angle increasing, the resistance force is nonmonotonic, whereas other forces continuously rise. Under three special landforms, the changes in the law of aerodynamic forces with the wind angle are almost similar to one another.

Keywords

high-speed train / cross wind / special landform / aerodynamic performance

References

[1] BakerC. The simulation of unsteady aerodynamic cross wind forces on trains [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2010, 98(2): 88-99

[2] BakerC. The flow around high speed trains [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2010, 98(6): 277-298

[3] KrajnovicS. Numerical simulation of the flow around an ICE2 train under the influence of a wind gust [C]. International Conference on Railway Engineering-Challenges for Railway Transportation in Information Age. Hong Kong, China, 20081-7

[4] BoccioloneM, CheliF, CorradiR, MuggiascaS, TomasiniG. Crosswind action on rail vehicles: Wind tunnel experimental analyses [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96(5): 584-610

[5] CheliF, RipamontiF, RocchiD, TomasiniG. Aerodynamic behaviour investigation of the new EMUV250 train to cross wind [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2010, 98(4): 189-201

[6] DiedrichS B, SimaM, OrellanoA, TengstrandH. Crosswind stability of a high-speed train on a high embankment [J]. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 2007, 221(2): 205-225

[7] SanquerS, BarreC, VirelM D, CleonL M. Effect of cross winds on high-speed trains: development of a new experimental methodology [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2004, 92(7): 535-545

[8] TianH-qi. Study on the characteristics of train air resistance under wind environment [J]. China Railway Science, 2008, 29(5): 108-112

[9] LiuH, TianH-Q, LiY-fei. Short-term forecasting optimization algorithms for wind speed along Qinghai-Tibet railway based on different intelligent modeling theories [J]. Journal of Central South University of Technology, 2009, 16(4): 690-696

[10] KhierW, BreuerM, DurstF. Flow structure around trains under side wind conditions: a numerical study [J]. Computers & Fluids, 2000, 29(2): 179-195

[11] CarrariniA. Reliability based analysis of the crosswind stability of railway vehicles [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2007, 95(7): 493-509

[12] TianH-qiTrain aerodynamics [M], 2007BeijingChina Railway Press30-32

[13] Key Laboratory of Traffic Safety on Track of Ministry of Education. Research report of aerodynamic performances of trains and wind-break facilities under strong wind conditions for Lanzhou-Urumqi high-speed railway [R]. Changsha: Central South University, 2010. (in Chinese)

[14] SuzukiM, TanemotoK, TatsuoM. Aerodynamics characteristics of train/vehicles under cross winds [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2003, 91(1): 209-218

[15] XiangJ, HeD, ZengQ-yuan. Effect of cross-wind on spatial vibration responses of train and track system [J]. Journal of Central South University of Technology, 2009, 16(3): 520-524

[16] RaghunathanR S, KimH D, SetoguchiT. Aerodynamics of high-speed railway train [J]. Progress in Aerospace Sciences, 2002, 38(6): 469-514