Abstract
In this study, an improved delayed detached eddy simulation (IDDES) method based on the shear-stress transport (SST) k-ω turbulence model has been used to investigate the underbody flow characteristics of a high-speed train operating at lower temperatures with Reynolds number Re=1.85×106. The accuracy of the numerical method has been validated by wind tunnel tests. The aerodynamic drag of the train, pressure distribution on the surface of the train, the flow around the vehicle, and the wake flow are compared for four temperature values: +15 °C, 0 °C, −15 °C, and −30 °C. It was found that lower operating temperatures significantly increased the aerodynamic drag force of the train. The drag overall at low temperatures increased by 5.3% (0 °C), 11.0% (−15 °C), and 17.4% (−30 °C), respectively, relative to the drag at +15 −C. In addition, the low temperature enhances the positive and negative pressures around and on the surface of the car body, raising the peak positive and negative pressure values in areas susceptible to impingement flow and to rapid changes in flow velocity. The range of train-induced winds around the car body is significantly reduced, the distribution area of vorticity moves backwards, and the airflow velocity in the bogie cavity is significantly increased. At the same time, the temperature causes a significant velocity reduction in the wake flow. It can be seen that the temperature reduction can seriously disturb the normal operation of the train while increasing the aerodynamic drag and energy consumption, and significantly interfering with the airflow characteristics around the car body.
概要
目的
受空气物理参数变化影响,低温下列车周围的流场特性与常温时存在差异。本文旨在对高速列车在低运行温度下的空气动力学性能及流场特性变化研究予以补充,探究低温对列车周围流场、列车风及列车尾流等方面的影响,以提高高速列车的抗高寒性能。
创新点
1. 将气体参数设置为低温环境,探究列车相比常温下的气动性能及周围流场的变化。2. 对比不同低温环境,探究不同程度低温对列车气动特性的影响。
方法
1. 通过基于SST k-ω湍流模型的IDDES数值计算方法对高速列车在雷诺数约为1.85×106的条件下低温运行的流动特性进行仿真。2. 依托后处理软件对不同温度下列车气动阻力、表面压力分布、车身周围流动及尾流等进行分析。3. 将结果进行比对,得出不同程度低温对列车气动特性的影响。
结论
1. 低温显著增加列车气动阻力;相比常温环境,0 °C、−15 °C及∑30 °C时的气动阻力分别增加了5.3%、11.0%和17.4%。2. 低温会增强车体周围的正负压力场,进而提高冲击流及流速快速变化区域的正负压力峰值。3. 低温时,列车风的作用范围缩小,涡量分布区域后移,而转向架舱内的气流流速增加。4. 低温时,列车的尾流速度降低。
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References
CEN (European Committee for Standardization), 2013. Railway Applications—Aerodynamics. Part 4: Requirements and Test Procedures for Aerodynamics on Open Track, EN 14067-4:2013. CEN.
Dong TY, Liang XF, Krajnović S, et al., 2019. Effects of simplifying train bogies on surrounding flow and aerodynamic forces. Journal of Wind Engineering and Industrial Aerodynamics, 191:170–182. https://doi.org/10.1016/j.jweia.2019.06.006
Dong TY, Minelli G, Wang JB, et al., 2020. The effect of ground clearance on the aerodynamics of a generic high-speed train. Journal of Fluids and Structures, 95:102990. https://doi.org/10.1016/j.jfluidstructs.2020.102990
Dorigatti F, Sterling M, Baker CJ, et al., 2015. Crosswind effects on the stability of a model passenger train—a comparison of static and moving experiments. Journal of Wind Engineering and Industrial Aerodynamics, 138: 36–51. https://doi.org/10.1016/j.jweia.2014.11.009
Fujii T, Kawashima K, Iikura S, et al., 2002. Preventive measures against snow for high-speed train operation in Japan. The 11th International Conference on Cold Regions Engineering, p.448–459. https://doi.org/10.1061/40621(254)38
Gao GJ, Zhang Y, Xie F, et al., 2019. Numerical study on the anti-snow performance of deflectors in the bogie region of a high-speed train using the discrete phase model. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 233(2):141–159. https://doi.org/10.1177/0954409718785290
Gao GJ, Zhang Y, Wang JB, 2020. Numerical and experimental investigation on snow accumulation on bogies of high-speed trains. Journal of Central South University, 27: 1039–1053. https://doi.org/10.1007/s11771-020-4350-x
Ghasemian M, Nejat A, 2015. Aerodynamic noise prediction of a horizontal axis wind turbine using improved delayed detached eddy simulation and acoustic analogy. Energy Conversion and Management, 99:210–220. https://doi.org/10.1016/j.enconman.2015.04.011
Han YD, Chen DW, Liu SQ, et al., 2020. An investigation into the effects of the Reynolds number on high-speed trains using a low temperature wind tunnel test facility. Fluid Dynamics & Materials Processing, 16(1):1–19. https://doi.org/10.32604/fdmp.2020.06525
Huang ZW, Feng YH, Gao GJ, et al., 2017. Numerical research of the snow and ice accumulation on the brake calipers of the high-speed trains. Journal of Railway Science and Engineering, 14(12):2516–2524 (in Chinese). https://doi.org/10.3969/j.issn.1672-7029.2017.12.002
Jing GQ, Ding D, Liu X, 2019. High-speed railway ballast flight mechanism analysis and risk management—a literature review. Construction and Building Materials, 223: 629–642. https://doi.org/10.1016/j.conbuildmat.2019.06.194
Jing JE, Gao GJ, 2013. Simulation of the action effect of wind-driven rain on high-speed train. Journal of Railway Science and Engineering, 10(3):99–102 (in Chinese). https://doi.org/10.19713/j.cnki.43-1423/u.2013.03.020
Kloow L, 2011. High-Speed Train Operation in Winter Climate. KTH Railway Group Publication, Stockholm, Sweden.
Liu MY, Wang JB, Zhu HF, et al., 2019. A numerical study of snow accumulation on the bogies of high-speed trains based on coupling improved delayed detached eddy simulation and discrete phase model. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 233(7):715–730. https://doi.org/10.1177/0954409718805817
Men JQ, 2015. Dynamic Performance Investigation of Alpine EMU at Low Temperature Conditions. MS Thesis, Southwest Jiaotong University, Chengdu, China (in Chinese).
Menter FR, 1994. Two-equation eddy-viscosity turbulence models for engineering applications. AIAA Journal, 32(8):1598–1605. https://doi.org/10.2514/3.12149
Nakhchi ME, Naung SW, Dala L, et al., 2022. Direct numerical simulations of aerodynamic performance of wind turbine aerofoil by considering the blades active vibrations. Renewable Energy, 191:669–684. https://doi.org/10.1016/j.renene.2022.04.052
Naung SW, Nakhchi ME, Rahmati M, 2021. Prediction of flutter effects on transient flow structure and aeroelasticity of low-pressure turbine cascade using direct numerical simulations. Aerospace Science and Technology, 119:107151. https://doi.org/10.1016/j.ast.2021.107151
Niu JQ, Sui Y, Yu QJ, et al., 2019. Numerical study on the impact of Mach number on the coupling effect of aerodynamic heating and aerodynamic pressure caused by a tube train. Journal of Wind Engineering and Industrial Aerodynamics, 190:100–111. https://doi.org/10.1016/j.jweia.2019.04.001
Raghunathan RS, Kim HD, Setoguchi T, 2002. Aerodynamics of high-speed railway train. Progress in Aerospace Sciences, 38(6–7):469–514. https://doi.org/10.1016/S0376-0421(02)00029-5
Rashidi MM, Hajipour A, Li T, et al., 2019. A review of recent studies on simulations for flow around high-speed trains. Journal of Applied and Computational Mechanics, 5(2):311–333. https://doi.org/10.22055/JACM.2018.25495.1272
Shi JW, Li MX, Zhang SM, et al., 2021. Effect of low temperature on aerodynamic performance of pantograph. Journal of Mechanical Engineering, 57(2):190–199 (in Chinese). https://doi.org/10.3901/JME.2021.02.190
Shur ML, Spalart PR, Strelets MK, et al., 2008. A hybrid RANS-LES approach with delayed-DES and wall-modelled LES capabilities. International Journal of Heat and Fluid Flow, 29(6):1638–1649. https://doi.org/10.1016/j.ijheatfluidflow.2008.07.001
Sui Y, Niu JQ, Ricco P, et al., 2021. Impact of vacuum degree on the aerodynamics of a high-speed train capsule running in a tube. International Journal of Heat and Fluid Flow, 88:108752. https://doi.org/10.1016/j.ijheatfluidflow.2020.108752
Tai BW, Liu JK, Wang TF, et al., 2017. Numerical modelling of anti-frost heave measures of high-speed railway subgrade in cold regions. Cold Regions Science and Technology, 141:28–35. https://doi.org/10.1016/j.coldregions.2017.05.009
Teng WX, 2019. Study on Dynamic Performance of High-Speed Trains at Low Temperature Environment. PhD Thesis, Southwest Jiaotong University, Chengdu, China (in Chinese). https://doi.org/10.27414/d.cnki.gxnju.2019.002176
Tian HQ, 2019. Review of research on high-speed railway aerodynamics in China. Transportation Safety and Environment, 1(1):1–21. https://doi.org/10.1093/tse/tdz014
Wang JB, Zhang J, Zhang Y, et al., 2018a. Impact of bogie cavity shapes and operational environment on snow accumulating on the bogies of high-speed trains. Journal of Wind Engineering and Industrial Aerodynamics, 176: 211–224. https://doi.org/10.1016/j.jweia.2018.03.027
Wang JB, Gao GJ, Liu MY, et al., 2018b. Numerical study of snow accumulation on the bogies of a high-speed train using URANS coupled with discrete phase model. Journal of Wind Engineering and Industrial Aerodynamics, 183:295–314. https://doi.org/10.1016/j.jweia.2018.11.003
Wang JB, Minelli G, Dong TY, et al., 2019. The effect of bogie fairings on the slipstream and wake flow of a high-speed train. An IDDES study. Journal of Wind Engineering and Industrial Aerodynamics, 191:183–202. https://doi.org/10.1016/j.jweia.2019.06.010
Wang JB, Minelli G, Dong TY, et al., 2020a. An IDDES investigation of Jacobs bogie effects on the slipstream and wake flow of a high-speed train. Journal of Wind Engineering and Industrial Aerodynamics, 202:104233. https://doi.org/10.1016/j.jweia.2020.104233
Wang JB, Minelli G, Zhang Y, et al., 2020b. An improved delayed detached eddy simulation study of the bogie cavity length effects on the aerodynamic performance of a high-speed train. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 234(12):2386–2401. https://doi.org/10.1177/0954406220907631
Wang JY, Wang TT, Yang MZ, et al., 2021. Effect of localized high temperature on the aerodynamic performance of a high-speed train passing through a tunnel. Journal of Wind Engineering and Industrial Aerodynamics, 208:104444. https://doi.org/10.1016/j.jweia.2020.104444
Wang WL, Liang YW, Zhang WH, et al., 2020. Experimental research into the low-temperature characteristics of a hydraulic damper and the effect on the dynamics of the pantograph of a high-speed train running in extreme cold weather conditions. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 234(8):896–907. https://doi.org/10.1177/0954409719879029
Xie F, Zhang J, Gao G, et al., 2017. Study of snow accumulation on a high-speed train’s bogies based on the discrete phase model. Journal of Applied Fluid Mechanics, 10(6): 1729–1745. https://doi.org/10.29252/jafm.73.245.27410
Yu MG, Liu JL, Dai ZY, 2021. Aerodynamic characteristics of a high-speed train exposed to heavy rain environment based on non-spherical raindrop. Journal of Wind Engineering and Industrial Aerodynamics, 211:104532. https://doi.org/10.1016/j.jweia.2021.104532
Zhang L, Yang MZ, Liang XF, 2018. Experimental study on the effect of wind angles on pressure distribution of train streamlined zone and train aerodynamic forces. Journal of Wind Engineering and Industrial Aerodynamics, 174: 330–343. https://doi.org/10.1016/j.jweia.2018.01.024
Zhu JY, Hu ZW, 2017. Flow between the train underbody and trackbed around the bogie area and its impact on ballast flight. Journal of Wind Engineering and Industrial Aerodynamics, 166:20–28. https://doi.org/10.1016/j.jweia.2017.03.009
Acknowledgments
This work is supported by the National Natural Science Foundation of China (Nos. 52172363 and 52202429), the National Key Research and Development Program of China (No. 2020YFF0304103-03), and the Independent Exploration of Graduate Students of Central South University (No. 2019zzts268), China.
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Guangjun GAO designed the research. Jiabin WANG and Yan ZHANG processed the corresponding data. Xiujuan MIAO wrote the first draft of the manuscript. Wenfei SHANG helped to organize the manuscript. Xiujuan MIAO and Wenfei SHANG revised and edited the final version.
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Xiujuan MIAO, Guangjun GAO, Jiabin WANG, Yan ZHANG, and Wenfei SHANG declare that they have no conflict of interest.
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Miao, X., Gao, G., Wang, J. et al. Effect of low operating temperature on the aerodynamic characteristics of a high-speed train. J. Zhejiang Univ. Sci. A 24, 284–298 (2023). https://doi.org/10.1631/jzus.A2200166
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DOI: https://doi.org/10.1631/jzus.A2200166
Key words
- High-speed train (HST)
- Low temperature
- Aerodynamic characteristics
- Cold region
- Improved delayed detached eddy simulation (IDDES)