Abstract: To improve the aerodynamic performance of high-speed trains (HSTs) running in the open air, a multi-objective aerodynamic optimization design method for the head shape of a HST is proposed in this paper. A parametric model of the HST was established and seven design variables of the head shape were extracted. Sample points and their exact values of optimization objectives were obtained by an optimal Latin hypercube sampling (opt. LHS) plan and computational fluid dynamic (CFD) simulations, respectively. A Kriging surrogate model was constructed based on the sample points and their optimization objectives. Taking the total aerodynamic drag force and the aerodynamic lift force of the tail coach as the optimization objectives, the multi-objective aerodynamic optimization design was performed based on a non-dominated sorting genetic algorithm-II (NSGA-II) and the Kriging model. After optimization, a series of Pareto-optimal head shapes were obtained. An optimal head shape was selected from the Pareto-optimal head shapes, and the aerodynamic performance of the HST with the optimal head shape was compared with that of the original train in conditions with and without crosswinds. Compared with the original train, the total aerodynamic drag force is reduced by 2.61% and the lift force of the tail coach is reduced by 9.90% in conditions without crosswind. Moreover, the optimal train benefits from lower fluctuations in aerodynamic loads in crosswind conditions.

高速列车头部外形多目标气动优化设计

[1]Baker, C., 2010. The flow around high speed trains. Journal of Wind Engineering and Industrial Aerodynamics, 98(6-7):277-298.

[2]Bell, J.R., Burton, D., Thompson, M.C., et al., 2015. Moving model analysis of the slipstream and wake of a high-speed train. Journal of Wind Engineering and Industrial Aerodynamics, 136:127-137.

[3]Brockie, N.J.W., Baker, C.J., 1990. The aerodynamic drag of high speed trains. Journal of Wind Engineering and Industrial Aerodynamics, 34(3):273-290.

[4]Ding, S.S., Li, Q., Tian, A.Q., et al., 2016. Aerodynamic design on high-speed trains. Acta Mechanica Sinica, 32(2):215-232.

[5]Eichinger, S., Sima, M., Thiele, F., 2015. Numerical simulation of a regional train in cross-wind. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 229(6):625-634.

[6]Han, J., Zhao, G.T., Xiao, X.B., et al., 2015. Effect of softening of cement asphalt mortar on vehicle operation safety and track dynamics. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 16(12):976-986. https://dx.doi.org/10.1631/jzus.A1500080

[7]Krajnović, S., 2009. Shape optimization of high-speed trains for improved aerodynamic performance. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 223(5):439-452.

[8]Lee, J., Kim, J., 2007. Kriging-based approximate optimization of high-speed train nose shape for reducing micropressure wave. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 221(2):263-270.

[9]Li, R., Xu, P., Peng, Y., et al., 2016. Multi-objective optimization of a high-speed train head based on the FFD method. Journal of Wind Engineering and Industrial Aerodynamics, 152:41-49.

[10]Li, T., Zhang, J.Y., Zhang, W.H., 2013. A numerical approach to the interaction between airflow and a high-speed train subjected to crosswind. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 14(7):482-493.

[11]Lophaven, S.N., Nielsen, H.B., Sondergaard, J., 2002. DACE-A Matlab Kriging Toolbox, Version 2.0.

[12]Muñoz-paniagua, J., Garcia, J., Crespo, A., 2014. Genetically aerodynamic optimization of the nose shape of a high-speed train entering a tunnel. Journal of Wind Engineering and Industrial Aerodynamics, 130:48-61.

[13]Nishino, T., Roberts, G.T., Zhang, X., 2008. Unsteady RANS and detached-eddy simulations of flow around a circular cylinder in ground effect. Journal of Fluids and Structures, 24(1):18-33.

[14]Oliver, M.A., Webster, R., 1990. Kriging: a method of interpolation for geographical information systems. International Journal of Geographical Information System, 4(3):313-332.

[15]Raghunathan, R.S., Kim, H.D., Setoguchi, T., 2002. Aerodynamics of high-speed railway train. Progress in Aerospace Sciences, 38(6-7):469-514.

[16]Schwanitz, S., Wittkowski, M., Rolny, V., et al., 2013. Pressure variations on a train: where is the threshold to railway passenger discomfort? Applied Ergonomics, 44(2):200-209.

[17]Smith, R.A., Zhou, J., 2014. Background of recent developments of passenger railways in China, the UK and other European countries. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 15(12):925-935.

[18]Sone, S., 2015. Comparison of the technologies of the Japanese Shinkansen and Chinese High-speed Railways. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 16(10):769-780.

[19]Sun, Z.X., Song, J.J., An, Y.R., 2010. Optimization of the head shape of the CRH3 high speed train. Science China Technological Science, 53(12):3356-3364.

[20]Tan, P., Ma, J.E., Zhou, J., et al., 2016. Sustainability development strategy of China’s high speed rail. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 17(12):923-932.

[21]Thompson, D.J., Iglesias, E.L., Liu, X.W., et al., 2015. Recent developments in the prediction and control of aerodynamic noise from high-speed trains. International Journal of Rail Transportation, 3(3):119-150.

[22]Vytla, V.V., Huang, P.G., Penmetsa, R.C., 2010. Multi objective aerodynamic shape optimization of high speed train nose using adaptive surrogate model. Proceedings of the 28th AIAA Applied Aerodynamic Conference, p.23-26.

[23]Xiao, X.B., Ling, L., Xiong, J.Y., et al., 2014. Study on the safety of operating high-speed railway vehicles subjected to crosswinds. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 15(9):694-710.

[24]Yang, G.W., Guo, D.L., Yao, S.B., et al., 2012. Aerodynamic design for China new high-speed trains. Science China Technological Sciences, 55(7):1923-1928.

[25]Yao, S.B., Guo, D.L., Yang, G.W., et al., 2012a. Distribution of high-speed train aerodynamic drag. Journal of the China Railway Society, 34(7):18-23 (in Chinese).

[26]Yao, S.B., Guo, D.L., Sun, Z.X., et al., 2012b. Multi-objective optimization of the streamlined head of high-speed trains based on the Kriging model. Science China Technological Science, 55(12):3495-3509.

[27]Yao, S.B., Guo, D.L., Sun, Z.X., et al., 2014. Optimization design for aerodynamic elements of high speed trains. Computers & Fluids, 95(3):56-73.

[28]Yao, S.B., Guo, D.L., Sun, Z.X., et al., 2016. Parametric design and optimization of high speed train nose. Optimization and Engineering, 17(3):605-630.

[29]Yu, M.G., Zhang, J.Y., Zhang, W.H., 2013. Multi-objective optimization design method of the high-speed train head. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 14(9):631-641.

[30]Zhai, W.M., Yang, J.Z., Li, Z., et al., 2015. Dynamics of high-speed train in crosswinds based on an air-train-track interaction model. Wind and Structures, 20(2):143-168.

[31]Zhang, L., Zhang, J.Y., Li, T., et al., 2016. Unsteady aerodynamic characteristics and safety of high-speed trains under crosswinds. Journal of Mechanical Engineering, 52(6):124-135 (in Chinese).

[32]Zhang, Z.Z., Zhou, D., 2013. Wind tunnel experiment on aerodynamic characteristic of streamline head of high speed train with different head shapes. Journal of Central South University (Science and Technology), 44(6):2603-2608 (in Chinese).